// Include GLGizmoBase.hpp before I18N.hpp as it includes some libigl code, which overrides our localization "L" macro.
#include "GLGizmoCut.hpp"
#include "slic3r/GUI/GLCanvas3D.hpp"

#include <GL/glew.h>

#include <wx/button.h>
#include <wx/checkbox.h>
#include <wx/stattext.h>
#include <wx/sizer.h>

#include <algorithm>

#include "slic3r/GUI/GUI_App.hpp"
#include "slic3r/GUI/Plater.hpp"
#include "slic3r/GUI/GUI_ObjectManipulation.hpp"
#include "slic3r/Utils/UndoRedo.hpp"
#include "libslic3r/AppConfig.hpp"
#include "libslic3r/Model.hpp"
#include "libslic3r/TriangleMeshSlicer.hpp"

#include "imgui/imgui_internal.h"

namespace Slic3r {
namespace GUI {

static const double Margin = 20.0;
static const ColorRGBA GRABBER_COLOR = ColorRGBA::YELLOW();

const unsigned int AngleResolution = 64;
const unsigned int ScaleStepsCount = 72;
const float ScaleStepRad = 2.0f * float(PI) / ScaleStepsCount;
const unsigned int ScaleLongEvery = 2;
const float ScaleLongTooth = 0.1f; // in percent of radius
const unsigned int SnapRegionsCount = 8;

// Generates mesh for a line
static GLModel::Geometry its_make_line(Vec3f beg_pos, Vec3f end_pos)
{
    GLModel::Geometry init_data;
    init_data.format = { GLModel::Geometry::EPrimitiveType::Lines, GLModel::Geometry::EVertexLayout::P3 };
    init_data.reserve_vertices(2);
    init_data.reserve_indices(2);

    // vertices
    init_data.add_vertex(beg_pos);
    init_data.add_vertex(end_pos);

    // indices
    init_data.add_line(0, 1);
    return init_data;
}

//! -- #ysFIXME those functions bodies are ported from GizmoRotation
// Generates mesh for a circle 
static void init_from_circle(GLModel& model, double radius)
{
    GLModel::Geometry init_data;
    init_data.format = { GLModel::Geometry::EPrimitiveType::LineLoop, GLModel::Geometry::EVertexLayout::P3 };
    init_data.reserve_vertices(ScaleStepsCount);
    init_data.reserve_indices(ScaleStepsCount);

    // vertices + indices
    for (unsigned int i = 0; i < ScaleStepsCount; ++i) {
        const float angle = float(i * ScaleStepRad);
        init_data.add_vertex(Vec3f(::cos(angle) * radius, ::sin(angle) * radius, 0.0f));
        init_data.add_index(i);
    }

    model.init_from(std::move(init_data));
    model.set_color(ColorRGBA::WHITE());
}

// Generates mesh for a scale
static void init_from_scale(GLModel& model, double radius)
{
    const float out_radius_long = radius * (1.0f + ScaleLongTooth);
    const float out_radius_short = radius * (1.0f + 0.5f * ScaleLongTooth);

    GLModel::Geometry init_data;
    init_data.format = { GLModel::Geometry::EPrimitiveType::Lines, GLModel::Geometry::EVertexLayout::P3 };
    init_data.reserve_vertices(2 * ScaleStepsCount);
    init_data.reserve_indices(2 * ScaleStepsCount);

    // vertices + indices
    for (unsigned int i = 0; i < ScaleStepsCount; ++i) {
        const float angle = float(i * ScaleStepRad);
        const float cosa = ::cos(angle);
        const float sina = ::sin(angle);
        const float in_x = cosa * radius;
        const float in_y = sina * radius;
        const float out_x = (i % ScaleLongEvery == 0) ? cosa * out_radius_long : cosa * out_radius_short;
        const float out_y = (i % ScaleLongEvery == 0) ? sina * out_radius_long : sina * out_radius_short;

        // vertices
        init_data.add_vertex(Vec3f(in_x, in_y, 0.0f));
        init_data.add_vertex(Vec3f(out_x, out_y, 0.0f));

        // indices
        init_data.add_line(i * 2, i * 2 + 1);
    }

    model.init_from(std::move(init_data));
    model.set_color(ColorRGBA::WHITE());
}

// Generates mesh for a snap_radii
static void init_from_snap_radii(GLModel& model, double radius)
{
    const float step = 2.0f * float(PI) / float(SnapRegionsCount);
    const float in_radius = radius / 3.0f;
    const float out_radius = 2.0f * in_radius;

    GLModel::Geometry init_data;
    init_data.format = { GLModel::Geometry::EPrimitiveType::Lines, GLModel::Geometry::EVertexLayout::P3 };
    init_data.reserve_vertices(2 * ScaleStepsCount);
    init_data.reserve_indices(2 * ScaleStepsCount);

    // vertices + indices
    for (unsigned int i = 0; i < ScaleStepsCount; ++i) {
        const float angle = float(i * step);
        const float cosa = ::cos(angle);
        const float sina = ::sin(angle);
        const float in_x = cosa * in_radius;
        const float in_y = sina * in_radius;
        const float out_x = cosa * out_radius;
        const float out_y = sina * out_radius;

        // vertices
        init_data.add_vertex(Vec3f(in_x, in_y, 0.0f));
        init_data.add_vertex(Vec3f(out_x, out_y, 0.0f));

        // indices
        init_data.add_line(i * 2, i * 2 + 1);
    }

    model.init_from(std::move(init_data));
    model.set_color(ColorRGBA::WHITE());
}

// Generates mesh for a angle_arc
static void init_from_angle_arc(GLModel& model, double angle, double radius)
{
    model.reset();

    const float step_angle = float(angle) / float(AngleResolution);
    const float ex_radius = radius;

    GLModel::Geometry init_data;
    init_data.format = { GLModel::Geometry::EPrimitiveType::LineStrip, GLModel::Geometry::EVertexLayout::P3 };
    init_data.reserve_vertices(1 + AngleResolution);
    init_data.reserve_indices(1 + AngleResolution);

    // vertices + indices
    for (unsigned int i = 0; i <= AngleResolution; ++i) {
        const float angle = float(i) * step_angle;
        init_data.add_vertex(Vec3f(::cos(angle) * ex_radius, ::sin(angle) * ex_radius, 0.0f));
        init_data.add_index(i);
    }

    model.init_from(std::move(init_data));
}

//! --

GLGizmoCut3D::GLGizmoCut3D(GLCanvas3D& parent, const std::string& icon_filename, unsigned int sprite_id)
    : GLGizmoBase(parent, icon_filename, sprite_id)
    , m_connector_type (CutConnectorType::Plug)
    , m_connector_style (size_t(CutConnectorStyle::Prizm))
    , m_connector_shape_id (size_t(CutConnectorShape::Circle))
    , m_rotation_matrix(Slic3r::Matrix3d::Identity())
    , m_connectors_group_id (3)
{
    m_modes = { _u8L("Planar")//, _u8L("Grid")
//              , _u8L("Radial"), _u8L("Modular")
    };

    m_connector_modes = { _u8L("Auto"), _u8L("Manual") };
    m_connector_types = { _u8L("Plug"), _u8L("Dowel") };

    m_connector_styles = { _u8L("Prizm"), _u8L("Frustum")
//              , _u8L("Claw")
    };

    m_connector_shapes = { _u8L("Triangle"), _u8L("Square"), _u8L("Hexagon"), _u8L("Circle")
//              , _u8L("D-shape")
    };

    m_axis_names = { "X", "Y", "Z" };

    update_connector_shape();
}

std::string GLGizmoCut3D::get_tooltip() const
{
    std::string tooltip;
    if (m_hover_id == Z) {
        double koef = m_imperial_units ? ObjectManipulation::mm_to_in : 1.0;
        std::string unit_str = " " + (m_imperial_units ? _u8L("inch") : _u8L("mm"));
        const BoundingBoxf3 tbb = transformed_bounding_box();
        if (tbb.max.z() >= 0.0) {
            double top = (tbb.min.z() <= 0.0 ? tbb.max.z() : tbb.size().z()) * koef;
            tooltip += format(top, 2) + " " + unit_str + " (" + _u8L("Top part") + ")";
            if (tbb.min.z() <= 0.0)
                tooltip += "\n";
        }
        if (tbb.min.z() <= 0.0) {
            double bottom = (tbb.max.z() <= 0.0 ? tbb.size().z() : (tbb.min.z() * (-1))) * koef;
            tooltip += format(bottom, 2) + " " + unit_str + " (" + _u8L("Bottom part") + ")";
        }
        return tooltip;
    }
    if (tooltip.empty() && (m_hover_id == X || m_hover_id == Y)) {
        std::string axis = m_hover_id == X ? "X" : "Y";
//        return axis + ": " + format(float(Geometry::rad2deg(Geometry::Transformation(m_rotation_m).get_rotation()[m_hover_id])), 1) + _u8L("°");
        return axis + ": " + format(float(Geometry::rad2deg(m_angle)), 1) + _u8L("°");
    }

    return tooltip;
}

bool GLGizmoCut3D::on_mouse(const wxMouseEvent &mouse_event)
{
    Vec2i mouse_coord(mouse_event.GetX(), mouse_event.GetY());
    Vec2d mouse_pos = mouse_coord.cast<double>();

    if (mouse_event.ShiftDown() && mouse_event.LeftDown())
        return gizmo_event(SLAGizmoEventType::LeftDown, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), mouse_event.CmdDown());
    if (cut_line_processing()) {
        if (mouse_event.ShiftDown()) {
            if (mouse_event.Moving()|| mouse_event.Dragging())
                return gizmo_event(SLAGizmoEventType::Moving, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), mouse_event.CmdDown());
            if (mouse_event.LeftUp())
                return gizmo_event(SLAGizmoEventType::LeftUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), mouse_event.CmdDown());
        }
        discard_cut_line_processing();
    }
    else if (mouse_event.Moving())
        return false;

    if (use_grabbers(mouse_event)) {
        if (m_hover_id >= m_connectors_group_id) {
            if (mouse_event.LeftDown()) {
                std::fill(m_selected.begin(), m_selected.end(), false);
                m_selected_count = 0;
            }
            if (mouse_event.LeftUp() && !mouse_event.ShiftDown())
                gizmo_event(SLAGizmoEventType::LeftUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), mouse_event.CmdDown());
        }
        return true;
    }

    static bool pending_right_up = false;
    if (mouse_event.LeftDown()) {
        bool grabber_contains_mouse = (get_hover_id() != -1);
        bool control_down = mouse_event.CmdDown();
        if ((!control_down || grabber_contains_mouse) &&
            gizmo_event(SLAGizmoEventType::LeftDown, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), false))
            return true;
    }
    else if (mouse_event.Dragging()) {
        bool control_down = mouse_event.CmdDown();
        if (m_parent.get_move_volume_id() != -1) {
            // don't allow dragging objects with the Sla gizmo on
            return true;
        }
        else if (!control_down &&
            gizmo_event(SLAGizmoEventType::Dragging, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), false)) {
            // the gizmo got the event and took some action, no need to do
            // anything more here
            m_parent.set_as_dirty();
            return true;
        }
        else if (control_down && (mouse_event.LeftIsDown() || mouse_event.RightIsDown())) {
            // CTRL has been pressed while already dragging -> stop current action
            if (mouse_event.LeftIsDown())
                gizmo_event(SLAGizmoEventType::LeftUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), true);
            else if (mouse_event.RightIsDown())
                pending_right_up = false;
        }
    }
    else if (mouse_event.LeftUp() && !m_parent.is_mouse_dragging()) {
        // in case SLA/FDM gizmo is selected, we just pass the LeftUp event
        // and stop processing - neither object moving or selecting is
        // suppressed in that case
        gizmo_event(SLAGizmoEventType::LeftUp, mouse_pos, mouse_event.ShiftDown(), mouse_event.AltDown(), mouse_event.CmdDown());
        return true;
    }
    else if (mouse_event.RightDown()) {
        if (m_parent.get_selection().get_object_idx() != -1 &&
            gizmo_event(SLAGizmoEventType::RightDown, mouse_pos, false, false, false)) {
            // we need to set the following right up as processed to avoid showing
            // the context menu if the user release the mouse over the object
            pending_right_up = true;
            // event was taken care of by the SlaSupports gizmo
            return true;
        }
    }
    else if (pending_right_up && mouse_event.RightUp()) {
        pending_right_up = false;
        return true;
    }
    return false;
}

void GLGizmoCut3D::shift_cut_z(double delta)
{
    Vec3d new_cut_center = m_plane_center;
    new_cut_center[Z] += delta;
    set_center(new_cut_center);
}

void GLGizmoCut3D::rotate_vec3d_around_center(Vec3d& vec, const Vec3d& angles, const Vec3d& center)
{
    if (m_rotations != angles) {
        m_rotation_matrix =   Eigen::AngleAxisd(angles[Z], Vec3d::UnitZ())
                            * Eigen::AngleAxisd(angles[Y], Vec3d::UnitY())
                            * Eigen::AngleAxisd(angles[X], Vec3d::UnitX());
        m_rotations = angles;
    }

    vec -= center;
    vec = m_rotation_matrix * vec;
    vec += center;
}

void GLGizmoCut3D::put_connetors_on_cut_plane(const Vec3d& cp_normal, double cp_offset)
{
    ModelObject* mo = m_c->selection_info()->model_object();
    if (CutConnectors& connectors = mo->cut_connectors; !connectors.empty()) {
        const float sla_shift        = m_c->selection_info()->get_sla_shift();
        const Vec3d& instance_offset = mo->instances[m_c->selection_info()->get_active_instance()]->get_offset();

        for (auto& connector : connectors) {
            // convert connetor pos to the world coordinates
            Vec3d pos = connector.pos + instance_offset;
            pos[Z] += sla_shift;
            // scalar distance from point to plane along the normal
            double distance = -cp_normal.dot(pos) + cp_offset;
            // move connector
            connector.pos += distance * cp_normal;
        }
    }
}

void GLGizmoCut3D::update_clipper()
{
    const Vec3d angles = Geometry::Transformation(m_rotation_m).get_rotation();
    BoundingBoxf3 box = bounding_box();

    double radius = box.radius();

    Vec3d beg, end = beg = m_plane_center;
    beg[Z] = box.center().z() - radius;//box.min.z();
    end[Z] = box.center().z() + radius;//box.max.z();

    rotate_vec3d_around_center(beg, angles, m_plane_center);
    rotate_vec3d_around_center(end, angles, m_plane_center);

    double dist = (m_plane_center - beg).norm();

    // calculate normal and offset for clipping plane
    Vec3d normal = end - beg;
    if (normal == Vec3d::Zero())
        return;
    dist = std::clamp(dist, 0.0001, normal.norm());
    normal.normalize();
    const double offset = normal.dot(beg) + dist;

    m_c->object_clipper()->set_range_and_pos(normal, offset, dist);

    put_connetors_on_cut_plane(normal, offset);

    if (m_raycasters.empty())
        on_register_raycasters_for_picking();
    else
        update_raycasters_for_picking_transform();
}

void GLGizmoCut3D::update_clipper_on_render()
{
    update_clipper();
    force_update_clipper_on_render = false;
}

void GLGizmoCut3D::set_center(const Vec3d& center)
{
    set_center_pos(center);
    update_clipper();
}

bool GLGizmoCut3D::render_combo(const std::string& label, const std::vector<std::string>& lines, size_t& selection_idx)
{
    ImGui::AlignTextToFramePadding();
    m_imgui->text(label);
    ImGui::SameLine(m_label_width);
    ImGui::PushItemWidth(m_control_width);
    
    size_t selection_out = selection_idx;
    // It is necessary to use BeginGroup(). Otherwise, when using SameLine() is called, then other items will be drawn inside the combobox.
    ImGui::BeginGroup();
    ImVec2 combo_pos = ImGui::GetCursorScreenPos();
    if (ImGui::BeginCombo(("##"+label).c_str(), "")) {
        for (size_t line_idx = 0; line_idx < lines.size(); ++line_idx) {
            ImGui::PushID(int(line_idx));
            if (ImGui::Selectable("", line_idx == selection_idx))
                selection_out = line_idx;

            ImGui::SameLine();
            ImGui::Text("%s", lines[line_idx].c_str());
            ImGui::PopID();
        }

        ImGui::EndCombo();
    }

    ImVec2      backup_pos = ImGui::GetCursorScreenPos();
    ImGuiStyle& style = ImGui::GetStyle();

    ImGui::SetCursorScreenPos(ImVec2(combo_pos.x + style.FramePadding.x, combo_pos.y + style.FramePadding.y));
    ImGui::Text("%s", lines[selection_out].c_str());
    ImGui::SetCursorScreenPos(backup_pos);
    ImGui::EndGroup();

    bool is_changed = selection_idx != selection_out;
    selection_idx = selection_out;

    if (is_changed)
        update_connector_shape();

    return is_changed;
}

bool GLGizmoCut3D::render_double_input(const std::string& label, double& value_in)
{
    ImGui::AlignTextToFramePadding();
    m_imgui->text(label);
    ImGui::SameLine(m_label_width);
    ImGui::PushItemWidth(m_control_width);

    double value = value_in;
    if (m_imperial_units)
        value *= ObjectManipulation::mm_to_in;
    double old_val = value;
    ImGui::InputDouble(("##" + label).c_str(), &value, 0.0f, 0.0f, "%.2f", ImGuiInputTextFlags_CharsDecimal);

    ImGui::SameLine();
    m_imgui->text(m_imperial_units ? _L("in") : _L("mm"));

    value_in = value * (m_imperial_units ? ObjectManipulation::in_to_mm : 1.0);
    return old_val != value;
}

bool GLGizmoCut3D::render_slider_double_input(const std::string& label, double& value_in, int& tolerance_in)
{
    ImGui::AlignTextToFramePadding();
    m_imgui->text(label);
    ImGui::SameLine(m_label_width);
    ImGui::PushItemWidth(m_control_width * 0.85f);

    float value = (float)value_in;
    if (m_imperial_units)
        value *= ObjectManipulation::mm_to_in;
    float old_val = value;

    const BoundingBoxf3 bbox = bounding_box();
    float mean_size = float((bbox.size().x() + bbox.size().y() + bbox.size().z()) / 9.0);
    float min_size = 1.f;
    if (m_imperial_units) {
        mean_size *= ObjectManipulation::mm_to_in;
        min_size  *= ObjectManipulation::mm_to_in;
    }
    std::string format = m_imperial_units ? "%.4f  " + _u8L("in") : "%.2f  " + _u8L("mm");

    m_imgui->slider_float(("##" + label).c_str(), &value, min_size, mean_size, format.c_str());
    value_in = (double)(value * (m_imperial_units ? ObjectManipulation::in_to_mm : 1.0));

    ImGui::SameLine(m_label_width + m_control_width + 3);
    ImGui::PushItemWidth(m_control_width * 0.3f);

    float old_tolerance, tolerance = old_tolerance = (float)tolerance_in;
    m_imgui->slider_float(("##tolerance_" + label).c_str(), &tolerance, 1.f, 20.f, "%.f %%", 1.f, true, _L("Tolerance"));
    tolerance_in = (int)tolerance;

    return old_val != value || old_tolerance != tolerance;
}

void GLGizmoCut3D::render_move_center_input(int axis)
{
    ImGui::AlignTextToFramePadding();
    m_imgui->text(m_axis_names[axis]+":");
    ImGui::SameLine();
    ImGui::PushItemWidth(0.3*m_control_width);

    Vec3d move = m_plane_center;
    double in_val, value = in_val = move[axis];
    if (m_imperial_units)
        value *= ObjectManipulation::mm_to_in;
    ImGui::InputDouble(("##move_" + m_axis_names[axis]).c_str(), &value, 0.0f, 0.0f, "%.2f", ImGuiInputTextFlags_CharsDecimal);
    ImGui::SameLine();

    double val = value * (m_imperial_units ? ObjectManipulation::in_to_mm : 1.0);

    if (in_val != val) {
        move[axis] = val;
        set_center(move);
    }
}

bool GLGizmoCut3D::render_connect_type_radio_button(CutConnectorType type)
{
    ImGui::SameLine(type == CutConnectorType::Plug ? m_label_width : 2*m_label_width);
    ImGui::PushItemWidth(m_control_width);
    if (m_imgui->radio_button(m_connector_types[size_t(type)], m_connector_type == type)) {
        m_connector_type = type;
        update_connector_shape();
        return true;
    }
    return false;
}

void GLGizmoCut3D::render_connect_mode_radio_button(CutConnectorMode mode)
{
    ImGui::SameLine(mode == CutConnectorMode::Auto ? m_label_width : 2*m_label_width);
    ImGui::PushItemWidth(m_control_width);
    if (m_imgui->radio_button(m_connector_modes[int(mode)], m_connector_mode == mode))
        m_connector_mode = mode;
}

bool GLGizmoCut3D::render_revert_button(const std::string& label_id)
{
    const ImGuiStyle& style = ImGui::GetStyle();

    ImGui::PushStyleVar(ImGuiStyleVar_ItemSpacing, { 1, style.ItemSpacing.y });
    ImGui::SameLine(m_label_width);

    ImGui::PushStyleColor(ImGuiCol_Button, { 0.25f, 0.25f, 0.25f, 0.0f });
    ImGui::PushStyleColor(ImGuiCol_ButtonHovered, { 0.4f, 0.4f, 0.4f, 1.0f });
    ImGui::PushStyleColor(ImGuiCol_ButtonActive, { 0.4f, 0.4f, 0.4f, 1.0f });

    std::string label;
    label += ImGui::RevertButton;
    bool revert = ImGui::Button((label + "##" + label_id).c_str());

    ImGui::PopStyleColor(3);

    if (ImGui::IsItemHovered())
        m_imgui->tooltip(into_u8(_L("Revert")).c_str(), ImGui::GetFontSize() * 20.0f);

    ImGui::PopStyleVar();

    ImGui::SameLine();
    return revert;
}

void GLGizmoCut3D::render_cut_plane()
{
    if (cut_line_processing())
        return;

    GLShaderProgram* shader = wxGetApp().get_shader("flat");
    if (shader == nullptr)
        return;

    glsafe(::glEnable(GL_DEPTH_TEST));
    glsafe(::glDisable(GL_CULL_FACE));
    glsafe(::glEnable(GL_BLEND));
    glsafe(::glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA));

    shader->start_using();

    const Camera& camera = wxGetApp().plater()->get_camera();
    const Transform3d view_model_matrix = camera.get_view_matrix() * Geometry::assemble_transform(
        m_plane_center,
        Geometry::Transformation(m_rotation_m).get_rotation(),
        Vec3d::Ones(),
        Vec3d::Ones()
    );
    shader->set_uniform("view_model_matrix", view_model_matrix);
    shader->set_uniform("projection_matrix", camera.get_projection_matrix());

    if (!m_plane.is_initialized()) {
        GLModel::Geometry init_data;
        init_data.format = { GLModel::Geometry::EPrimitiveType::Triangles, GLModel::Geometry::EVertexLayout::P3 };
//        init_data.color = { 0.8f, 0.8f, 0.8f, 0.5f };
        init_data.reserve_vertices(4);
        init_data.reserve_indices(6);

        // vertices
        float radius = (float)bounding_box().radius();
        init_data.add_vertex(Vec3f(-radius, -radius, 0.0));
        init_data.add_vertex(Vec3f( radius, -radius, 0.0));
        init_data.add_vertex(Vec3f( radius,  radius, 0.0));
        init_data.add_vertex(Vec3f(-radius,  radius, 0.0));

        // indices
        init_data.add_triangle(0, 1, 2);
        init_data.add_triangle(2, 3, 0);

        m_plane.init_from(std::move(init_data));
    }

    if (can_perform_cut())
        m_plane.set_color({ 0.8f, 0.8f, 0.8f, 0.5f });
    else
        m_plane.set_color({ 1.0f, 0.8f, 0.8f, 0.5f });
    m_plane.render();

    glsafe(::glEnable(GL_CULL_FACE));
    glsafe(::glDisable(GL_BLEND));

    shader->stop_using();
}

void GLGizmoCut3D::render_cut_center_graber()
{
    glsafe(::glClear(GL_DEPTH_BUFFER_BIT));

    GLShaderProgram* shader = wxGetApp().get_shader("gouraud_light");
    if (!shader)
        return;

    ColorRGBA color = m_hover_id == Z ? complementary(GRABBER_COLOR) : GRABBER_COLOR;

    const Camera& camera = wxGetApp().plater()->get_camera();
    const Grabber& graber = m_grabbers.front();

    const BoundingBoxf3 box = bounding_box();

    const double mean_size = float((box.size().x() + box.size().y() + box.size().z()) / 3.0);
    double size = m_dragging && m_hover_id == Z ? double(graber.get_dragging_half_size(mean_size)) : double(graber.get_half_size(mean_size));

    Vec3d cone_scale = Vec3d(0.75 * size, 0.75 * size, 1.8 * size);
    Vec3d offset = 1.25 * size * Vec3d::UnitZ();

    shader->start_using();
    shader->set_uniform("emission_factor", 0.1f);
    shader->set_uniform("projection_matrix", camera.get_projection_matrix());

    const Transform3d view_matrix = camera.get_view_matrix() * Geometry::translation_transform(m_plane_center) * m_rotation_m;

    auto render = [shader, this](GLModel& model, const ColorRGBA& color, Transform3d view_model_matrix) {
        shader->set_uniform("view_model_matrix", view_model_matrix);
        shader->set_uniform("normal_matrix", (Matrix3d)view_model_matrix.matrix().block(0, 0, 3, 3).inverse().transpose());
        model.set_color(color);
        model.render();
    };

    auto render_grabber_connection = [shader, camera, view_matrix, this](const ColorRGBA& color)
    {
        shader->stop_using();
        GLShaderProgram* line_shader = OpenGLManager::get_gl_info().is_core_profile() ? wxGetApp().get_shader("dashed_thick_lines") : wxGetApp().get_shader("flat");
        if (!line_shader)
            return;

        line_shader->start_using();
        line_shader->set_uniform("emission_factor", 0.1f);
        line_shader->set_uniform("projection_matrix", camera.get_projection_matrix());

        const Transform3d trafo = view_matrix * Geometry::assemble_transform(Vec3d::Zero(), Vec3d::Zero(), Vec3d(1.0, 1.0, m_grabber_connection_len));
        line_shader->set_uniform("view_model_matrix", trafo);
        line_shader->set_uniform("normal_matrix", (Matrix3d)trafo.matrix().block(0, 0, 3, 3).inverse().transpose());
        line_shader->set_uniform("width", 0.2f);

        m_grabber_connection.set_color(color);
        m_grabber_connection.render();

        line_shader->stop_using();
        shader->start_using();
    };

    auto render_rotation_snapping = [shader, camera, this](Axis axis, const ColorRGBA& color)
    {
        Transform3d view_model_matrix = camera.get_view_matrix() * Geometry::translation_transform(m_plane_center) * m_start_dragging_m;

        if (axis == X)
            view_model_matrix = view_model_matrix * Geometry::rotation_transform(0.5 * PI * Vec3d::UnitY()) * Geometry::rotation_transform(-PI * Vec3d::UnitZ());
        else
            view_model_matrix = view_model_matrix * Geometry::rotation_transform(-0.5 * PI * Vec3d::UnitZ()) * Geometry::rotation_transform(-0.5 * PI * Vec3d::UnitY());

        shader->stop_using();

        GLShaderProgram* line_shader = OpenGLManager::get_gl_info().is_core_profile() ? wxGetApp().get_shader("dashed_thick_lines") : wxGetApp().get_shader("flat");
        if (!line_shader)
            return;

        line_shader->start_using();
        line_shader->set_uniform("emission_factor", 0.1f);
        line_shader->set_uniform("projection_matrix", camera.get_projection_matrix());

        line_shader->set_uniform("view_model_matrix", view_model_matrix);
        line_shader->set_uniform("normal_matrix", (Matrix3d)view_model_matrix.matrix().block(0, 0, 3, 3).inverse().transpose());
        line_shader->set_uniform("width", 0.25f);

        m_circle.render();
        m_scale.render();
        m_snap_radii.render();
        m_reference_radius.render();
        if (m_dragging) {
            line_shader->set_uniform("width", 1.5f);
            m_angle_arc.set_color(color);
            m_angle_arc.render();
        }

        line_shader->stop_using();
        shader->start_using();
    };

    // render Z grabber

    if ((!m_dragging && m_hover_id < 0))
        render_grabber_connection(color);
    render(m_sphere.model, color, view_matrix * Geometry::assemble_transform(Vec3d::Zero(), Vec3d::Zero(), size * Vec3d::Ones()));

    if (!m_dragging && m_hover_id < 0 || m_hover_id == Z)
    {
        const BoundingBoxf3 tbb = transformed_bounding_box();
        if (tbb.min.z() <= 0.0)
            render(m_cone.model, color, view_matrix * Geometry::assemble_transform(-offset, PI * Vec3d::UnitX(), cone_scale));

        if (tbb.max.z() >= 0.0)
            render(m_cone.model, color, view_matrix * Geometry::assemble_transform(offset, Vec3d::Zero(), cone_scale));
    }

    // render top sphere for X/Y grabbers

    if ((!m_dragging && m_hover_id < 0) || m_hover_id == X || m_hover_id == Y)
    {
        size = m_dragging ? double(graber.get_dragging_half_size(mean_size)) : double(graber.get_half_size(mean_size));
        color = m_hover_id == Y ? complementary(ColorRGBA::GREEN()) :
                m_hover_id == X ? complementary(ColorRGBA::RED())   : ColorRGBA::GRAY();
        render(m_sphere.model, color, view_matrix * Geometry::assemble_transform(m_grabber_connection_len * Vec3d::UnitZ(), Vec3d::Zero(), size * Vec3d::Ones()));
    }

    // render X grabber

    if ((!m_dragging && m_hover_id < 0) || m_hover_id == X)
    {
        size = m_dragging && m_hover_id == X ? double(graber.get_dragging_half_size(mean_size)) : double(graber.get_half_size(mean_size));
        cone_scale = Vec3d(0.75 * size, 0.75 * size, 1.8 * size);
        color = m_hover_id == X ? complementary(ColorRGBA::RED()) : ColorRGBA::RED();

        if (m_hover_id == X) {
            render_grabber_connection(color);
            render_rotation_snapping(X, color);
        }

        offset = Vec3d(0.0, 1.25 * size, m_grabber_connection_len);
        render(m_cone.model, color, view_matrix * Geometry::assemble_transform(offset, -0.5 * PI * Vec3d::UnitX(), cone_scale));
        offset = Vec3d(0.0, -1.25 * size, m_grabber_connection_len);
        render(m_cone.model, color, view_matrix * Geometry::assemble_transform(offset, 0.5 * PI * Vec3d::UnitX(), cone_scale));
    }

    // render Y grabber

    if ((!m_dragging && m_hover_id < 0) || m_hover_id == Y)
    {
        size = m_dragging && m_hover_id == Y ? double(graber.get_dragging_half_size(mean_size)) : double(graber.get_half_size(mean_size));
        cone_scale = Vec3d(0.75 * size, 0.75 * size, 1.8 * size);
        color = m_hover_id == Y ? complementary(ColorRGBA::GREEN()) : ColorRGBA::GREEN();

        if (m_hover_id == Y) {
            render_grabber_connection(color);
            render_rotation_snapping(Y, color);
        }

        offset = Vec3d(1.25 * size, 0.0, m_grabber_connection_len);
        render(m_cone.model, color, view_matrix * Geometry::assemble_transform(offset, 0.5 * PI * Vec3d::UnitY(), cone_scale));
        offset = Vec3d(-1.25 * size, 0.0, m_grabber_connection_len);
        render(m_cone.model, color, view_matrix * Geometry::assemble_transform(offset, -0.5 * PI * Vec3d::UnitY(), cone_scale));
    }

    shader->stop_using();
}

void GLGizmoCut3D::render_cut_line()
{
    if (!cut_line_processing() || m_line_end == Vec3d::Zero())
        return;

    glsafe(::glEnable(GL_DEPTH_TEST));
    glsafe(::glClear(GL_DEPTH_BUFFER_BIT));

    GLShaderProgram* shader = OpenGLManager::get_gl_info().is_core_profile() ? wxGetApp().get_shader("dashed_thick_lines") : wxGetApp().get_shader("flat");
    if (shader != nullptr) {
        shader->start_using();

        const Camera& camera = wxGetApp().plater()->get_camera();
        shader->set_uniform("view_model_matrix", camera.get_view_matrix());
        shader->set_uniform("projection_matrix", camera.get_projection_matrix());
        shader->set_uniform("width", 0.25f);

        m_cut_line.reset();
        m_cut_line.init_from(its_make_line((Vec3f)m_line_beg.cast<float>(), (Vec3f)m_line_end.cast<float>()));

        m_cut_line.set_color(GRABBER_COLOR);
        m_cut_line.render();

        shader->stop_using();
    }
}

bool GLGizmoCut3D::on_init()
{
    m_grabbers.emplace_back();
    m_shortcut_key = WXK_CONTROL_C;

    // initiate info shortcuts
    const wxString ctrl = GUI::shortkey_ctrl_prefix();
    const wxString alt  = GUI::shortkey_alt_prefix();

    m_shortcuts.push_back(std::make_pair(_L("Left click"),        _L("Add connector")));
    m_shortcuts.push_back(std::make_pair(_L("Right click"),       _L("Remove connector")));
    m_shortcuts.push_back(std::make_pair(_L("Drag"),              _L("Move connector")));
    m_shortcuts.push_back(std::make_pair(ctrl + _L("Left click"), _L("Add connector to selection")));
    m_shortcuts.push_back(std::make_pair(alt + _L("Left click"),  _L("Remove connector from selection")));
    m_shortcuts.push_back(std::make_pair(ctrl + "A",              _L("Select all connectors")));

    return true;
}

void GLGizmoCut3D::on_load(cereal::BinaryInputArchive& ar)
{
    ar( m_keep_upper, m_keep_lower, m_rotate_lower, m_rotate_upper, m_hide_cut_plane, m_mode, m_connectors_editing,//m_selected,
 //       m_connector_depth_ratio, m_connector_size, m_connector_mode, m_connector_type, m_connector_style, m_connector_shape_id,
        m_ar_plane_center, m_ar_rotations);

    set_center_pos(m_ar_plane_center, true);
    m_rotation_m = Geometry::rotation_transform(m_ar_rotations);

    force_update_clipper_on_render = true;

    m_parent.request_extra_frame();
}

void GLGizmoCut3D::on_save(cereal::BinaryOutputArchive& ar) const
{ 
    ar( m_keep_upper, m_keep_lower, m_rotate_lower, m_rotate_upper, m_hide_cut_plane, m_mode, m_connectors_editing,//m_selected,
 //       m_connector_depth_ratio, m_connector_size, m_connector_mode, m_connector_type, m_connector_style, m_connector_shape_id,
        m_ar_plane_center, m_ar_rotations);
}

std::string GLGizmoCut3D::on_get_name() const
{
    return _u8L("Cut");
}

void GLGizmoCut3D::on_set_state()
{
    if (m_state == On) {
        update_bb();

        // initiate archived values
        m_ar_plane_center   = m_plane_center;
        m_ar_rotations = Geometry::Transformation(m_rotation_m).get_rotation();

        m_parent.request_extra_frame();
    }
    else
        m_c->object_clipper()->release();

	force_update_clipper_on_render = m_state == On;
}

void GLGizmoCut3D::on_register_raycasters_for_picking()
{
    assert(m_raycasters.empty());
    set_volumes_picking_state(false);

    init_picking_models();

    if (m_connectors_editing) {
        if (CommonGizmosDataObjects::SelectionInfo* si = m_c->selection_info()) {
            const CutConnectors& connectors = si->model_object()->cut_connectors;
            for (size_t i = 0; i < connectors.size(); ++i)
                m_raycasters.emplace_back(m_parent.add_raycaster_for_picking(SceneRaycaster::EType::Gizmo, i + m_connectors_group_id, *(m_shapes[connectors[i].attribs]).mesh_raycaster, Transform3d::Identity()));
        }
    }
    else {
        m_raycasters.emplace_back(m_parent.add_raycaster_for_picking(SceneRaycaster::EType::Gizmo, X, *m_cone.mesh_raycaster, Transform3d::Identity()));
        m_raycasters.emplace_back(m_parent.add_raycaster_for_picking(SceneRaycaster::EType::Gizmo, X, *m_cone.mesh_raycaster, Transform3d::Identity()));

        m_raycasters.emplace_back(m_parent.add_raycaster_for_picking(SceneRaycaster::EType::Gizmo, Y, *m_cone.mesh_raycaster, Transform3d::Identity()));
        m_raycasters.emplace_back(m_parent.add_raycaster_for_picking(SceneRaycaster::EType::Gizmo, Y, *m_cone.mesh_raycaster, Transform3d::Identity()));

        m_raycasters.emplace_back(m_parent.add_raycaster_for_picking(SceneRaycaster::EType::Gizmo, Z, *m_sphere.mesh_raycaster, Transform3d::Identity()));
        m_raycasters.emplace_back(m_parent.add_raycaster_for_picking(SceneRaycaster::EType::Gizmo, Z, *m_cone.mesh_raycaster, Transform3d::Identity()));
        m_raycasters.emplace_back(m_parent.add_raycaster_for_picking(SceneRaycaster::EType::Gizmo, Z, *m_cone.mesh_raycaster, Transform3d::Identity()));
    }

    update_raycasters_for_picking_transform();
}

void GLGizmoCut3D::on_unregister_raycasters_for_picking()
{
    m_parent.remove_raycasters_for_picking(SceneRaycaster::EType::Gizmo);
    m_raycasters.clear();
    set_volumes_picking_state(true);
}

void GLGizmoCut3D::update_raycasters_for_picking()
{
    on_unregister_raycasters_for_picking();
    on_register_raycasters_for_picking();
}

void GLGizmoCut3D::set_volumes_picking_state(bool state)
{
    std::vector<std::shared_ptr<SceneRaycasterItem>>* raycasters = m_parent.get_raycasters_for_picking(SceneRaycaster::EType::Volume);
    if (raycasters != nullptr) {
        const Selection& selection = m_parent.get_selection();
        const Selection::IndicesList ids = selection.get_volume_idxs();
        for (unsigned int id : ids) {
            const GLVolume* v = selection.get_volume(id);
            auto it = std::find_if(raycasters->begin(), raycasters->end(), [v](std::shared_ptr<SceneRaycasterItem> item) { return item->get_raycaster() == v->mesh_raycaster.get(); });
            if (it != raycasters->end())
                (*it)->set_active(state);
        }
    }
}

void GLGizmoCut3D::update_raycasters_for_picking_transform()
{
    if (m_connectors_editing) {
        CommonGizmosDataObjects::SelectionInfo* si = m_c->selection_info();
        if (!si) 
            return;
        const ModelObject* mo = si->model_object();
        const CutConnectors& connectors = mo->cut_connectors;
        if (connectors.empty())
            return;
        auto inst_id = m_c->selection_info()->get_active_instance();
        if (inst_id < 0)
            return;

        const Vec3d& instance_offset = mo->instances[inst_id]->get_offset();
        const float sla_shift = m_c->selection_info()->get_sla_shift();

        const ClippingPlane* cp = m_c->object_clipper()->get_clipping_plane();
        const Vec3d& normal = cp && cp->is_active() ? cp->get_normal() : m_clp_normal;

        for (size_t i = 0; i < connectors.size(); ++i) {
            const CutConnector& connector = connectors[i];

            double height = connector.height;
            // recalculate connector position to world position
            Vec3d pos = connector.pos + instance_offset;
            if (connector.attribs.type == CutConnectorType::Dowel &&
                connector.attribs.style == CutConnectorStyle::Prizm) {
                pos -= height * normal;
                height *= 2;
            }
            pos[Z] += sla_shift;

            m_raycasters[i]->set_transform(Geometry::assemble_transform(
                pos,
                Geometry::Transformation(m_rotation_m).get_rotation(),
                Vec3d(connector.radius, connector.radius, height)
            ));
        }
    }
    else {
        const Transform3d trafo = Geometry::translation_transform(m_plane_center) * m_rotation_m;

        const BoundingBoxf3 box = bounding_box();
        const double mean_size = float((box.size().x() + box.size().y() + box.size().z()) / 6.0);

        double size = double(m_grabbers.front().get_half_size(mean_size));
        Vec3d scale = Vec3d(0.75 * size, 0.75 * size, 1.8 * size);

        Vec3d offset = Vec3d(0.0, 1.25 * size, m_grabber_connection_len);
        m_raycasters[0]->set_transform(trafo * Geometry::assemble_transform(offset, -0.5 * PI * Vec3d::UnitX(), scale));
        offset = Vec3d(0.0, -1.25 * size, m_grabber_connection_len);
        m_raycasters[1]->set_transform(trafo * Geometry::assemble_transform(offset, 0.5 * PI * Vec3d::UnitX(), scale));

        offset = Vec3d(1.25 * size, 0.0, m_grabber_connection_len);
        m_raycasters[2]->set_transform(trafo * Geometry::assemble_transform(offset, 0.5 * PI * Vec3d::UnitY(), scale));
        offset = Vec3d(-1.25 * size, 0.0, m_grabber_connection_len);
        m_raycasters[3]->set_transform(trafo * Geometry::assemble_transform(offset, -0.5 * PI * Vec3d::UnitY(), scale));

        offset = 1.25 * size * Vec3d::UnitZ();
        m_raycasters[4]->set_transform(trafo * Geometry::assemble_transform(Vec3d::Zero(), Vec3d::Zero(), size * Vec3d::Ones()));
        m_raycasters[5]->set_transform(trafo * Geometry::assemble_transform(-offset, PI * Vec3d::UnitX(), scale));
        m_raycasters[6]->set_transform(trafo * Geometry::assemble_transform(offset, Vec3d::Zero(), scale));
    }
}

void GLGizmoCut3D::on_set_hover_id() 
{
}

bool GLGizmoCut3D::on_is_activable() const
{
    // This is assumed in GLCanvas3D::do_rotate, do not change this
    // without updating that function too.
    return m_parent.get_selection().is_single_full_instance();
}

Vec3d GLGizmoCut3D::mouse_position_in_local_plane(Axis axis, const Linef3& mouse_ray) const
{
    double half_pi = 0.5 * PI;

    Transform3d m = Transform3d::Identity();

    switch (axis)
    {
    case X:
    {
        m.rotate(Eigen::AngleAxisd(half_pi, Vec3d::UnitZ()));
        m.rotate(Eigen::AngleAxisd(-half_pi, Vec3d::UnitY()));
        break;
    }
    case Y:
    {
        m.rotate(Eigen::AngleAxisd(half_pi, Vec3d::UnitY()));
        m.rotate(Eigen::AngleAxisd(half_pi, Vec3d::UnitZ()));
        break;
    }
    default:
    case Z:
    {
        // no rotation applied
        break;
    }
    }

    m = m * m_start_dragging_m.inverse();
    m.translate(-m_plane_center);

    return transform(mouse_ray, m).intersect_plane(0.0);
}

void GLGizmoCut3D::on_dragging(const UpdateData& data)
{
    if (m_hover_id < 0)
        return;

    CutConnectors& connectors = m_c->selection_info()->model_object()->cut_connectors;

    if (m_hover_id == Z) {
        Vec3d starting_box_center = m_plane_center - Vec3d::UnitZ();// some Margin
        rotate_vec3d_around_center(starting_box_center, Geometry::Transformation(m_rotation_m).get_rotation(), m_plane_center);

        const Vec3d& starting_drag_position = m_plane_center;
        double projection = 0.0;

        Vec3d starting_vec = starting_drag_position - starting_box_center;
        if (starting_vec.norm() != 0.0) {
            Vec3d mouse_dir = data.mouse_ray.unit_vector();
            // finds the intersection of the mouse ray with the plane parallel to the camera viewport and passing throught the starting position
            // use ray-plane intersection see i.e. https://en.wikipedia.org/wiki/Line%E2%80%93plane_intersection algebric form
            // in our case plane normal and ray direction are the same (orthogonal view)
            // when moving to perspective camera the negative z unit axis of the camera needs to be transformed in world space and used as plane normal
            Vec3d inters = data.mouse_ray.a + (starting_drag_position - data.mouse_ray.a).dot(mouse_dir) / mouse_dir.squaredNorm() * mouse_dir;
            // vector from the starting position to the found intersection
            Vec3d inters_vec = inters - starting_drag_position;

            starting_vec.normalize();
            // finds projection of the vector along the staring direction
            projection = inters_vec.dot(starting_vec);
        }
        if (wxGetKeyState(WXK_SHIFT))
            projection = m_snap_step * (double)std::round(projection / m_snap_step);

        Vec3d shift = starting_vec * projection;

        // move  cut plane center
        set_center(m_plane_center + shift);
    }

    else if (m_hover_id == X || m_hover_id == Y) {

        Vec3d rotation = Vec3d::Zero();

        const Vec2d mouse_pos = to_2d(mouse_position_in_local_plane((Axis)m_hover_id, data.mouse_ray));

        const Vec2d orig_dir = Vec2d::UnitX();
        const Vec2d new_dir = mouse_pos.normalized();

        const double two_pi = 2.0 * PI;

        double theta = ::acos(std::clamp(new_dir.dot(orig_dir), -1.0, 1.0));
        if (cross2(orig_dir, new_dir) < 0.0)
            theta = two_pi - theta;

        const double len = mouse_pos.norm();
        // snap to coarse snap region
        if (m_snap_coarse_in_radius <= len && len <= m_snap_coarse_out_radius) {
            const double step = two_pi / double(SnapRegionsCount);
            theta = step * std::round(theta / step);
        }
        else {
            // snap to fine snap region (scale)
            if (m_snap_fine_in_radius <= len && len <= m_snap_fine_out_radius) {
                const double step = two_pi / double(ScaleStepsCount);
                theta = step * std::round(theta / step);
            }
        }

        if (theta == two_pi)
            theta = 0.0;
        if (m_hover_id == X)
            theta += 0.5 * PI;

        rotation[m_hover_id] = theta;
        m_rotation_m = m_start_dragging_m * Geometry::rotation_transform(rotation);

        m_angle = theta;
        while (m_angle > two_pi)
            m_angle -= two_pi;
        if (m_angle < 0.0)
            m_angle += two_pi;

        update_clipper();
    }

    else if (m_hover_id >= m_connectors_group_id && m_connector_mode == CutConnectorMode::Manual)
    {
        std::pair<Vec3d, Vec3d> pos_and_normal;
        Vec3d pos_world;
        if (!unproject_on_cut_plane(data.mouse_pos.cast<double>(), pos_and_normal, pos_world))
            return;
        connectors[m_hover_id - m_connectors_group_id].pos    = pos_and_normal.first;
        update_raycasters_for_picking_transform();
    }
}

void GLGizmoCut3D::on_start_dragging()
{
    m_angle = 0.0;
    if (m_hover_id >= m_connectors_group_id && m_connector_mode == CutConnectorMode::Manual)
        Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Move connector"), UndoRedo::SnapshotType::GizmoAction);

    if (m_hover_id == X || m_hover_id == Y)
        m_start_dragging_m = m_rotation_m;
}

void GLGizmoCut3D::on_stop_dragging()
{
    if (m_hover_id == X || m_hover_id == Y) {
        m_angle_arc.reset();
        m_angle = 0.0;
        Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Rotate cut plane"), UndoRedo::SnapshotType::GizmoAction);
        m_ar_rotations = Geometry::Transformation(m_rotation_m).get_rotation();

        m_start_dragging_m = m_rotation_m;
    }
    else if (m_hover_id == Z) {
        Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Move cut plane"), UndoRedo::SnapshotType::GizmoAction);
        m_ar_plane_center = m_plane_center;
    }
}

void GLGizmoCut3D::set_center_pos(const Vec3d& center_pos, bool force/* = false*/)
{
    if (force || transformed_bounding_box(true).contains(center_pos)) {
        m_plane_center = center_pos;
        m_center_offset = m_plane_center - m_bb_center;
    }
}

BoundingBoxf3 GLGizmoCut3D::bounding_box() const
{
    BoundingBoxf3 ret;
    const Selection& selection = m_parent.get_selection();
    const Selection::IndicesList& idxs = selection.get_volume_idxs();
    for (unsigned int i : idxs) {
        const GLVolume* volume = selection.get_volume(i);
        // respect just to the solid parts for FFF and ignore pad and supports for SLA
        if (!volume->is_modifier && !volume->is_sla_pad() && !volume->is_sla_support())
            ret.merge(volume->transformed_convex_hull_bounding_box());
    }
    return ret;
}

BoundingBoxf3 GLGizmoCut3D::transformed_bounding_box(bool revert_move /*= false*/) const
{
    // #ysFIXME !!!
    BoundingBoxf3 ret;

    const ModelObject* mo = m_c->selection_info()->model_object();
    if (!mo)
        return ret;
    const int instance_idx = m_c->selection_info()->get_active_instance();
    if (instance_idx < 0)
        return ret;
    const ModelInstance* mi = mo->instances[instance_idx];

    const Vec3d& instance_offset = mi->get_offset();
    Vec3d cut_center_offset = m_plane_center - instance_offset;
    cut_center_offset[Z] -= m_c->selection_info()->get_sla_shift();

    const auto move  = Geometry::assemble_transform(-cut_center_offset);
    const auto move2 = Geometry::assemble_transform(m_plane_center);

    const auto cut_matrix = (revert_move ? move2 : Transform3d::Identity()) * m_rotation_m.inverse() * move;

    const Selection& selection = m_parent.get_selection();
    const Selection::IndicesList& idxs = selection.get_volume_idxs();
    for (unsigned int i : idxs) {
        const GLVolume* volume = selection.get_volume(i);
        // respect just to the solid parts for FFF and ignore pad and supports for SLA
        if (!volume->is_modifier && !volume->is_sla_pad() && !volume->is_sla_support()) {

            const auto instance_matrix = Geometry::assemble_transform(
                Vec3d::Zero(),  // don't apply offset
                volume->get_instance_rotation().cwiseProduct(Vec3d(1.0, 1.0, 1.0)),
                volume->get_instance_scaling_factor(),
                volume->get_instance_mirror()
            );

            auto volume_travo = instance_matrix * volume->get_volume_transformation().get_matrix();
            auto volume_offset = Geometry::Transformation(volume_travo).get_offset();

            ret.merge(volume->transformed_convex_hull_bounding_box(cut_matrix * volume_travo));
        }
    }
    return ret;
}

bool GLGizmoCut3D::update_bb()
{
    const BoundingBoxf3 box = bounding_box();
    if (m_max_pos != box.max && m_min_pos != box.min) {
        m_max_pos = box.max;
        m_min_pos = box.min;
        m_bb_center = box.center();
        if (box.contains(m_center_offset))
            set_center_pos(m_bb_center + m_center_offset, true);
        else
            set_center_pos(m_bb_center, true);

        m_radius = box.radius();
        m_grabber_connection_len = 0.75 * m_radius;// std::min<double>(0.75 * m_radius, 35.0);
        m_grabber_radius = m_grabber_connection_len * 0.85;

        m_snap_coarse_in_radius   = m_grabber_radius / 3.0f;
        m_snap_coarse_out_radius  = 2.0f * m_snap_coarse_in_radius;
        m_snap_fine_in_radius     = m_grabber_connection_len * 0.85;
        m_snap_fine_out_radius    = m_grabber_connection_len * 1.15f;

        m_plane.reset();
        m_cone.reset();
        m_sphere.reset();
        m_grabber_connection.reset();
        m_circle.reset();
        m_scale.reset();
        m_snap_radii.reset();
        m_reference_radius.reset();

        on_unregister_raycasters_for_picking();

        if (CommonGizmosDataObjects::SelectionInfo* selection = m_c->selection_info()) {
            m_selected.clear();
            m_selected.resize(selection->model_object()->cut_connectors.size(), false);
        }

        return true;
    }
    return false;
}

void GLGizmoCut3D::init_picking_models()
{
    if (!m_cone.model.is_initialized()) {
        indexed_triangle_set its = its_make_cone(1.0, 1.0, PI / 12.0);
        m_cone.model.init_from(its);
        m_cone.mesh_raycaster = std::make_unique<MeshRaycaster>(std::make_shared<const TriangleMesh>(std::move(its)));
    }
    if (!m_sphere.model.is_initialized()) {
        indexed_triangle_set its = its_make_sphere(1.0, PI / 12.0);
        m_sphere.model.init_from(its);
        m_sphere.mesh_raycaster = std::make_unique<MeshRaycaster>(std::make_shared<const TriangleMesh>(std::move(its)));
    }
}

void GLGizmoCut3D::on_render()
{
    if (update_bb() || force_update_clipper_on_render) {
        update_clipper_on_render();
        m_c->object_clipper()->set_behavior(m_connectors_editing, m_connectors_editing, 0.4f);
    }

    init_picking_models();

    if (!m_grabber_connection.is_initialized())
        m_grabber_connection.init_from(its_make_line(Vec3f::Zero(), Vec3f::UnitZ()));
    if (!m_circle.is_initialized())
        init_from_circle(m_circle, m_grabber_radius);
    if (!m_scale.is_initialized())
        init_from_scale(m_scale, m_grabber_radius);
    if (!m_snap_radii.is_initialized())
        init_from_snap_radii(m_snap_radii, m_grabber_radius);
    if (!m_reference_radius.is_initialized()) {
        m_reference_radius.init_from(its_make_line(Vec3f::Zero(), m_grabber_connection_len * Vec3f::UnitX()));
        m_reference_radius.set_color(ColorRGBA::WHITE());
    }
    if (!m_angle_arc.is_initialized() || m_angle != 0.0)
        init_from_angle_arc(m_angle_arc, m_angle, m_grabber_connection_len);

    render_connectors();

    if (! m_connectors_editing)
        ::glDisable(GL_DEPTH_TEST);
    m_c->object_clipper()->render_cut();
    if (! m_connectors_editing)
        ::glEnable(GL_DEPTH_TEST);

    if (!m_hide_cut_plane && !m_connectors_editing) {
        render_cut_plane();
        render_cut_center_graber();
    }

    render_cut_line();
}

void GLGizmoCut3D::on_render_input_window(float x, float y, float bottom_limit)
{
    static float last_y = 0.0f;
    static float last_h = 0.0f;

    m_imgui->begin(_L("Cut"), ImGuiWindowFlags_AlwaysAutoResize | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoCollapse);

    m_imperial_units    = wxGetApp().app_config->get("use_inches") == "1";
    m_label_width       = m_imgui->get_style_scaling() * 100.0f;
    m_control_width     = m_imgui->get_style_scaling() * 150.0f;

    // adjust window position to avoid overlap the view toolbar
    const float win_h = ImGui::GetWindowHeight();
    y = std::min(y, bottom_limit - win_h);
    ImGui::SetWindowPos(ImVec2(x, y), ImGuiCond_Always);
    if (last_h != win_h || last_y != y) {
        // ask canvas for another frame to render the window in the correct position
        m_imgui->set_requires_extra_frame();
        if (last_h != win_h)
            last_h = win_h;
        if (last_y != y)
            last_y = y;
    }

    // render_combo(_u8L("Mode"), m_modes, m_mode);

    CutConnectors& connectors = m_c->selection_info()->model_object()->cut_connectors;
    bool cut_clicked = false;
    bool revert_move{ false };
    bool revert_rotation{ false };
    bool fff_printer = wxGetApp().plater()->printer_technology() == ptFFF;

    if (! m_connectors_editing) {
        if (m_mode == size_t(CutMode::cutPlanar)) {
            ImGui::AlignTextToFramePadding();
            m_imgui->text_colored(ImGuiWrapper::COL_ORANGE_LIGHT, _L("Hold SHIFT key and connect some two points of an object to cut by line"));
            ImGui::Separator();

            ////////
            double koef = m_imperial_units ? ObjectManipulation::mm_to_in : 1.0;
            std::string unit_str = m_imperial_units ? _u8L("inch") : _u8L("mm");
            const BoundingBoxf3 tbb = transformed_bounding_box();
            double top = (tbb.min.z() <= 0.0 ? tbb.max.z() : tbb.size().z()) * koef;
            double bottom = (tbb.max.z() <= 0.0 ? tbb.size().z() : (tbb.min.z() * (-1))) * koef;
            
            Vec3d tbb_sz = tbb.size();
            wxString size =    "X: " + double_to_string(tbb_sz.x() * koef, 2) + unit_str +
                            ",  Y: " + double_to_string(tbb_sz.y() * koef, 2) + unit_str +
                            ",  Z: " + double_to_string(tbb_sz.z() * koef, 2) + unit_str;

            ImGui::AlignTextToFramePadding();
            m_imgui->text(_L("Build size"));
            ImGui::SameLine(m_label_width);
            m_imgui->text_colored(ImGuiWrapper::COL_ORANGE_LIGHT, size);
            
            //static float v = 0.; // TODO: connect to cutting plane position
            m_imgui->text(_L("Cut position: "));
            render_move_center_input(Z);
            //m_imgui->input_double(unit_str, v);
            //v = std::clamp(v, 0.f, float(bottom+top));
            if (m_imgui->button("Reset cutting plane")) {
                set_center(bounding_box().center());
                m_rotation_m = Transform3d::Identity();
                m_angle_arc.reset();
                update_clipper();
            }
        }

        if (m_mode == size_t(CutMode::cutPlanar)) {
            ImGui::Separator();

            ImGui::AlignTextToFramePadding();
            m_imgui->text(_L("After cut") + ": ");
            bool keep = true;

            ImGui::SameLine(m_label_width);
            m_imgui->text(_L("Upper part"));
            ImGui::SameLine(2 * m_label_width);

            m_imgui->disabled_begin(!connectors.empty());
            m_imgui->checkbox(_L("Keep") + "##upper", connectors.empty() ? m_keep_upper : keep);
            m_imgui->disabled_end();
            ImGui::SameLine(3 * m_label_width);

            m_imgui->disabled_begin(!m_keep_upper);

            m_imgui->disabled_begin(is_approx(Geometry::Transformation(m_rotation_m).get_rotation().x(), 0.) && is_approx(Geometry::Transformation(m_rotation_m).get_rotation().y(), 0.));
            if (m_imgui->checkbox(_L("Place on cut") + "##upper", m_place_on_cut_upper))
                m_rotate_upper = false;
            m_imgui->disabled_end();

            ImGui::SameLine();
            if (m_imgui->checkbox(_L("Flip") + "##upper", m_rotate_upper))
                m_place_on_cut_upper = false;

            m_imgui->disabled_end();

            m_imgui->text("");
            ImGui::SameLine(m_label_width);
            m_imgui->text(_L("Lower part"));
            ImGui::SameLine(2 * m_label_width);

            m_imgui->disabled_begin(!connectors.empty());

            m_imgui->checkbox(_L("Keep") + "##lower", connectors.empty() ? m_keep_lower : keep);
            m_imgui->disabled_end();
            ImGui::SameLine(3 * m_label_width);
            m_imgui->disabled_begin(!m_keep_lower);

            if (m_imgui->checkbox(_L("Place on cut") + "##lower", m_place_on_cut_lower)) 
                m_rotate_lower = false;
            ImGui::SameLine();
            if (m_imgui->checkbox(_L("Flip") + "##lower", m_rotate_lower))
                m_place_on_cut_lower = false;

            m_imgui->disabled_end();
        }

        if (fff_printer) {
            ImGui::Separator();

            m_imgui->disabled_begin(!m_keep_upper || !m_keep_lower);
            if (m_imgui->button(_L("Add/Edit connectors"))) {
                m_connectors_editing = true;
                update_raycasters_for_picking();
            }
            m_imgui->disabled_end();
        }
    } 
    else { // connectors mode
        if (m_imgui->button("? " + (m_show_shortcuts ? wxString(ImGui::CollapseBtn) : wxString(ImGui::ExpandBtn))))
            m_show_shortcuts = !m_show_shortcuts;

        if (m_show_shortcuts)
            for (const auto& shortcut : m_shortcuts ){
                m_imgui->text_colored(ImGuiWrapper::COL_ORANGE_LIGHT, shortcut.first);
                ImGui::SameLine(m_label_width);
                m_imgui->text(shortcut.second);
            }

        m_imgui->disabled_begin(!m_keep_lower || !m_keep_upper);
        // Connectors section
        ImGui::Separator();

        ImGui::AlignTextToFramePadding();
        m_imgui->text_colored(ImGuiWrapper::COL_ORANGE_LIGHT, _L("Connectors"));

        m_imgui->disabled_begin(connectors.empty());
        ImGui::SameLine(m_label_width);
        if (m_imgui->button("  " + _L("Reset") + "  ##connectors"))
            reset_connectors();
        m_imgui->disabled_end();
/*
        m_imgui->text(_L("Mode"));
        render_connect_mode_radio_button(CutConnectorMode::Auto);
        render_connect_mode_radio_button(CutConnectorMode::Manual);
*/

        if (m_selected_count == 1)
            for (size_t idx = 0; idx < m_selected.size(); idx++)
                if (m_selected[idx]) {
                    auto& connector = connectors[idx];
                    m_connector_depth_ratio             = connector.height;
                    m_connector_depth_ratio_tolerance   = 100 * connector.height_tolerance;
                    m_connector_size                    = 2. * connector.radius;
                    m_connector_size_tolerance          = 100 * connector.radius_tolerance;
                    m_connector_type                    = connector.attribs.type;
                    m_connector_style                   = size_t(connector.attribs.style);
                    m_connector_shape_id                = size_t(connector.attribs.shape);

                    break;
                }

        m_imgui->text(_L("Type"));
        bool type_changed = render_connect_type_radio_button(CutConnectorType::Plug);
        type_changed     |= render_connect_type_radio_button(CutConnectorType::Dowel);
        if (type_changed)
            for (size_t idx = 0; idx < m_selected.size() ; idx++)
                if (m_selected[idx])
                    connectors[idx].attribs.type = CutConnectorType(m_connector_type);

        if (render_combo(_u8L("Style"), m_connector_styles, m_connector_style))
            for (size_t idx = 0; idx < m_selected.size() ; idx++)
                if (m_selected[idx])
                    connectors[idx].attribs.style = CutConnectorStyle(m_connector_style) ;

        if (render_combo(_u8L("Shape"), m_connector_shapes, m_connector_shape_id))
            for (size_t idx = 0; idx < m_selected.size() ; idx++)
                if (m_selected[idx])
                    connectors[idx].attribs.shape = CutConnectorShape(m_connector_shape_id);

        if (render_slider_double_input(_u8L("Depth ratio"), m_connector_depth_ratio, m_connector_depth_ratio_tolerance))
            for (size_t idx = 0; idx < m_selected.size() ; idx++)
                if (m_selected[idx]) {
                    auto& connector = connectors[idx];
                    connector.height            = float(m_connector_depth_ratio);
                    connector.height_tolerance  = 0.01f * m_connector_depth_ratio_tolerance;
                }

        if (render_slider_double_input(_u8L("Size"), m_connector_size, m_connector_size_tolerance))
            for (size_t idx = 0; idx < m_selected.size(); idx++)
                if (m_selected[idx]) {
                    auto& connector = connectors[idx];
                    connector.radius            = float(m_connector_size * 0.5);
                    connector.radius_tolerance  = 0.01f * m_connector_size_tolerance;
                }

        m_imgui->disabled_end();

        if (m_imgui->button(_L("Confirm connectors"))) {
            m_clp_normal = m_c->object_clipper()->get_clipping_plane()->get_normal();
            m_connectors_editing = false;
            update_raycasters_for_picking();
            std::fill(m_selected.begin(), m_selected.end(), false);
            m_selected_count = 0;
        }
        m_parent.request_extra_frame();
    }

    ImGui::Separator();

    if (fff_printer)
        m_imgui->text(m_has_invalid_connector ? wxString(ImGui::WarningMarkerSmall) + _L("Invalid connectors detected.") : wxString());
    if (!m_connectors_editing) {
        m_imgui->disabled_begin(!can_perform_cut());
        cut_clicked = m_imgui->button(_L("Perform cut"));
        m_imgui->disabled_end();
    }

    m_imgui->end();

    ////////
    m_imgui->begin(wxString("DEBUG"));
    static bool hide_clipped = false;
    static bool fill_cut = false;
    static float contour_width = 0.4f;
    m_imgui->checkbox(_L("Hide cut plane and grabbers"), m_hide_cut_plane);
    if (m_imgui->checkbox("hide_clipped", hide_clipped) && !hide_clipped)
        m_clp_normal = m_c->object_clipper()->get_clipping_plane()->get_normal();
    m_imgui->checkbox("fill_cut", fill_cut);
    m_imgui->slider_float("contour_width", &contour_width, 0.f, 3.f);
    m_c->object_clipper()->set_behavior(hide_clipped || m_connectors_editing, fill_cut || m_connectors_editing, contour_width);
    m_imgui->end();
    ////////

    if (cut_clicked && (m_keep_upper || m_keep_lower))
        perform_cut(m_parent.get_selection());

    if (revert_move)
        set_center(bounding_box().center());
    if (revert_rotation) {
        m_rotation_m = Transform3d::Identity();
        m_angle_arc.reset();
        update_clipper();
    }
}

// get volume transformation regarding to the "border". Border is related from the size of connectors
Transform3d GLGizmoCut3D::get_volume_transformation(const ModelVolume* volume) const
{
    bool is_prizm_dowel = m_connector_type == CutConnectorType::Dowel && m_connector_style == size_t(CutConnectorStyle::Prizm);
    const Transform3d connector_trafo = Geometry::assemble_transform(
        is_prizm_dowel ? Vec3d(0.0, 0.0, -m_connector_depth_ratio) : Vec3d::Zero(),
        Geometry::Transformation(m_rotation_m).get_rotation(),
        Vec3d(0.5*m_connector_size, 0.5*m_connector_size, is_prizm_dowel ? 2 * m_connector_depth_ratio : m_connector_depth_ratio),
        Vec3d::Ones());
    const Vec3d connector_bb = m_connector_mesh.transformed_bounding_box(connector_trafo).size();

    const Vec3d bb = volume->mesh().bounding_box().size();

    // calculate an unused border - part of the the volume, where we can't put connectors
    const Vec3d border_scale(connector_bb.x() / bb.x(), connector_bb.y() / bb.y(), connector_bb.z() / bb.z());

    const Transform3d vol_matrix = volume->get_matrix();
    const Vec3d vol_trans = vol_matrix.translation();
    // offset of the volume will be changed after scaling, so calculate the needed offset and set it to a volume_trafo
    const Vec3d offset(vol_trans.x() * border_scale.x(), vol_trans.y() * border_scale.y(), vol_trans.z() * border_scale.z());

    // scale and translate volume to suppress to put connectors too close to the border
    return Geometry::assemble_transform(offset, Vec3d::Zero(), Vec3d::Ones() - border_scale, Vec3d::Ones()) * vol_matrix;
}

void GLGizmoCut3D::render_connectors()
{
    if (!m_connectors_editing)
        return;

    ::glEnable(GL_DEPTH_TEST);

    if (cut_line_processing() || m_connector_mode == CutConnectorMode::Auto || !m_c->selection_info())
        return;

    const ModelObject* mo = m_c->selection_info()->model_object();
    auto inst_id = m_c->selection_info()->get_active_instance();
    if (inst_id < 0)
        return;
    const CutConnectors& connectors = mo->cut_connectors;
    if (connectors.size() != m_selected.size()) {
        // #ysFIXME
        m_selected.clear();
        m_selected.resize(connectors.size(), false);
    }

    GLShaderProgram* shader = wxGetApp().get_shader("gouraud_light");
    if (shader == nullptr)
        return;

    shader->start_using();

    ScopeGuard guard([shader]() { shader->stop_using(); });

    const Camera& camera = wxGetApp().plater()->get_camera();

    ColorRGBA render_color;

    const ModelInstance* mi = mo->instances[inst_id];
    const Vec3d& instance_offset = mi->get_offset();
    const float sla_shift        = m_c->selection_info()->get_sla_shift();

    const ClippingPlane* cp = m_c->object_clipper()->get_clipping_plane();
    const Vec3d& normal = cp && cp->is_active() ? cp->get_normal() : m_clp_normal;

    const Transform3d instance_trafo = Geometry::assemble_transform(Vec3d(0.0, 0.0, sla_shift)) * mi->get_transformation().get_matrix();

    m_has_invalid_connector = false;

    for (size_t i = 0; i < connectors.size(); ++i) {
        const CutConnector& connector = connectors[i];

        double height = connector.height;
        // recalculate connector position to world position
        Vec3d pos = connector.pos + instance_offset;
        if (connector.attribs.type  == CutConnectorType::Dowel &&
            connector.attribs.style == CutConnectorStyle::Prizm) {
            pos -= height * normal;
            height *= 2;
        }
        pos[Z] += sla_shift;

        // First decide about the color of the point.
        if (size_t(m_hover_id- m_connectors_group_id) == i)
            render_color = ColorRGBA::CYAN();
        else if (m_selected[i])
            render_color = ColorRGBA::DARK_GRAY();
        else // neither hover nor picking
            render_color = m_connectors_editing ? ColorRGBA(1.0f, 1.0f, 1.0f, 0.5f) : ColorRGBA(1.0f, 0.3f, 0.3f, 0.5f);

        // ! #ysFIXME rework get_volume_transformation
        if (0) { // else { // neither hover nor picking
            int mesh_id = -1;
            for (const ModelVolume* mv : mo->volumes) {
                ++mesh_id;
                if (!mv->is_model_part())
                    continue;

                const Transform3d volume_trafo = get_volume_transformation(mv);

                if (m_c->raycaster()->raycasters()[mesh_id]->is_valid_intersection(pos, -normal, instance_trafo * volume_trafo)) {
                    render_color = m_connectors_editing ? ColorRGBA(1.0f, 1.0f, 1.0f, 0.5f) : /*ColorRGBA(0.5f, 0.5f, 0.5f, 1.f)*/ColorRGBA(1.0f, 0.3f, 0.3f, 0.5f);
                    break;
                }
                render_color = ColorRGBA(1.0f, 0.3f, 0.3f, 0.5f);
                m_has_invalid_connector = true;
            }
        }

        m_shapes[connector.attribs].model.set_color(render_color);

        const Transform3d view_model_matrix = camera.get_view_matrix() * Geometry::assemble_transform(
            pos,
            Geometry::Transformation(m_rotation_m).get_rotation(),
            Vec3d(connector.radius, connector.radius, height)
        );
        shader->set_uniform("view_model_matrix", view_model_matrix);
        shader->set_uniform("projection_matrix", camera.get_projection_matrix());

        m_shapes[connector.attribs].model.render();
    }
}

bool GLGizmoCut3D::can_perform_cut() const
{
    if (m_has_invalid_connector || (!m_keep_upper && !m_keep_lower) || m_connectors_editing)
        return false;

    const BoundingBoxf3 tbb = transformed_bounding_box(true);
    return tbb.contains(m_plane_center);
}

void GLGizmoCut3D::perform_cut(const Selection& selection)
{
    const int instance_idx = selection.get_instance_idx();
    const int object_idx = selection.get_object_idx();

    wxCHECK_RET(instance_idx >= 0 && object_idx >= 0, "GLGizmoCut: Invalid object selection");

    // m_cut_z is the distance from the bed. Subtract possible SLA elevation.
    const GLVolume* first_glvolume = selection.get_first_volume();
    const double object_cut_z = m_plane_center.z() - first_glvolume->get_sla_shift_z();

    const Vec3d& instance_offset = wxGetApp().plater()->model().objects[object_idx]->instances[instance_idx]->get_offset();

    Vec3d cut_center_offset = m_plane_center - instance_offset;
    cut_center_offset[Z] -= first_glvolume->get_sla_shift_z();

    Plater* plater = wxGetApp().plater();

    bool create_dowels_as_separate_object = false;
    if (0.0 < object_cut_z && can_perform_cut()) {
        ModelObject* mo = plater->model().objects[object_idx];
        if(!mo)
            return;

        Vec3d rotation = Geometry::Transformation(m_rotation_m).get_rotation();

        const bool has_connectors = !mo->cut_connectors.empty();
        {
            Plater::TakeSnapshot snapshot(plater, _L("Cut by Plane"));
            // update connectors pos as offset of its center before cut performing
            if (has_connectors && m_connector_mode == CutConnectorMode::Manual) {
                m_selected.clear();

                for (CutConnector& connector : mo->cut_connectors) {
                    connector.rotation = rotation;

                    if (connector.attribs.type == CutConnectorType::Dowel) {
                        if (connector.attribs.style == CutConnectorStyle::Prizm)
                            connector.height *= 2;
                        create_dowels_as_separate_object = true;
                    }
                    else {
                        // culculate shift of the connector center regarding to the position on the cut plane
                        Vec3d shifted_center = m_plane_center + Vec3d::UnitZ();
                        rotate_vec3d_around_center(shifted_center, rotation, m_plane_center);
                        Vec3d norm = (shifted_center - m_plane_center).normalized();
                        connector.pos += norm * (0.5 * connector.height);
                    }
                }
                mo->apply_cut_connectors(_u8L("Connector"));
            }
        }

        plater->cut(object_idx, instance_idx, cut_center_offset, rotation,
            only_if(has_connectors ? true : m_keep_upper, ModelObjectCutAttribute::KeepUpper) |
            only_if(has_connectors ? true : m_keep_lower, ModelObjectCutAttribute::KeepLower) |
            only_if(m_place_on_cut_upper, ModelObjectCutAttribute::PlaceOnCutUpper) | 
            only_if(m_place_on_cut_lower, ModelObjectCutAttribute::PlaceOnCutLower) | 
            only_if(m_rotate_upper, ModelObjectCutAttribute::FlipUpper) | 
            only_if(m_rotate_lower, ModelObjectCutAttribute::FlipLower) | 
            only_if(create_dowels_as_separate_object, ModelObjectCutAttribute::CreateDowels));
    }
    else {
        // the object is SLA-elevated and the plane is under it.
    }
}



// Unprojects the mouse position on the mesh and saves hit point and normal of the facet into pos_and_normal
// Return false if no intersection was found, true otherwise.
bool GLGizmoCut3D::unproject_on_cut_plane(const Vec2d& mouse_position, std::pair<Vec3d, Vec3d>& pos_and_normal, Vec3d& pos_world)
{
    const float sla_shift = m_c->selection_info()->get_sla_shift();

    const ModelObject* mo = m_c->selection_info()->model_object();
    const ModelInstance* mi = mo->instances[m_c->selection_info()->get_active_instance()];
    const Transform3d    instance_trafo = sla_shift > 0.0 ? 
        Geometry::assemble_transform(Vec3d(0.0, 0.0, sla_shift)) * mi->get_transformation().get_matrix() : mi->get_transformation().get_matrix();
    const Camera& camera = wxGetApp().plater()->get_camera();

    int mesh_id = -1;
    for (const ModelVolume* mv : mo->volumes) {
        ++mesh_id;
        if (!mv->is_model_part())
            continue;
        Vec3f normal;
        Vec3f hit;
        bool clipping_plane_was_hit = false;

//        const Transform3d volume_trafo = get_volume_transformation(mv);
        const Transform3d volume_trafo = mv->get_transformation().get_matrix();

        m_c->raycaster()->raycasters()[mesh_id]->unproject_on_mesh(mouse_position, instance_trafo * volume_trafo,
            camera, hit, normal, m_c->object_clipper()->get_clipping_plane(true),
            nullptr, &clipping_plane_was_hit);
        if (clipping_plane_was_hit) {
            // recalculate hit to object's local position
            Vec3d hit_d = hit.cast<double>();
            hit_d -= mi->get_offset();
            hit_d[Z] -= sla_shift;

            // Return both the point and the facet normal.
            pos_and_normal = std::make_pair(hit_d, normal.cast<double>());
            pos_world = hit.cast<double>();
            return true;
        }
    }
    return false;
}

void GLGizmoCut3D::reset_connectors()
{
    m_c->selection_info()->model_object()->cut_connectors.clear();
    update_model_object();
    m_selected.clear();
}

void GLGizmoCut3D::update_connector_shape()
{
    CutConnectorAttributes attribs = { m_connector_type, CutConnectorStyle(m_connector_style), CutConnectorShape(m_connector_shape_id) };
    if (m_shapes.find(attribs) == m_shapes.end()) {
        const indexed_triangle_set its = ModelObject::get_connector_mesh(attribs);
        m_shapes[attribs].model.init_from(its);
        m_shapes[attribs].mesh_raycaster = std::make_unique<MeshRaycaster>(std::make_shared<const TriangleMesh>(std::move(its)));;
    }

    const indexed_triangle_set its = ModelObject::get_connector_mesh(attribs);
    m_connector_mesh.clear();
    m_connector_mesh = TriangleMesh(its);
}

void GLGizmoCut3D::update_model_object()
{
    const ModelObjectPtrs& mos = wxGetApp().model().objects;
    ModelObject* mo = m_c->selection_info()->model_object();
    wxGetApp().obj_list()->update_info_items(std::find(mos.begin(), mos.end(), mo) - mos.begin());

    m_parent.post_event(SimpleEvent(EVT_GLCANVAS_SCHEDULE_BACKGROUND_PROCESS));

    update_raycasters_for_picking();
}

bool GLGizmoCut3D::cut_line_processing() const
{
    return m_line_beg != Vec3d::Zero();
}

void GLGizmoCut3D::discard_cut_line_processing()
{
    m_line_beg = m_line_end = Vec3d::Zero();
}

bool GLGizmoCut3D::process_cut_line(SLAGizmoEventType action, const Vec2d& mouse_position)
{
    const float sla_shift = m_c->selection_info()->get_sla_shift();
    const ModelObject* mo = m_c->selection_info()->model_object();
    const ModelInstance* mi = mo->instances[m_c->selection_info()->get_active_instance()];
    Transform3d inst_trafo = sla_shift > 0.0 ?
        Geometry::assemble_transform(Vec3d(0.0, 0.0, sla_shift)) * mi->get_transformation().get_matrix() :
        mi->get_transformation().get_matrix();

    const Camera& camera = wxGetApp().plater()->get_camera();

    Vec3d pt;
    Vec3d dir;
    MeshRaycaster::line_from_mouse_pos(mouse_position, Transform3d::Identity(), camera, pt, dir);
    dir.normalize();
    pt += dir; // Move the pt along dir so it is not clipped.

    if (action == SLAGizmoEventType::LeftDown && !cut_line_processing()) {
        m_line_beg = pt;
        m_line_end = pt;
        on_unregister_raycasters_for_picking();
        return true;
    }

    if (cut_line_processing()) {
        m_line_end = pt;
        if (action == SLAGizmoEventType::LeftDown || action == SLAGizmoEventType::LeftUp) {
            Vec3d line_dir = m_line_end - m_line_beg;
            if (line_dir.norm() < 3.0)
                return true;
            Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Cut by line"), UndoRedo::SnapshotType::GizmoAction);

            Vec3d cross_dir = line_dir.cross(dir).normalized();
            Eigen::Quaterniond q;
            Transform3d m = Transform3d::Identity();
            m.matrix().block(0, 0, 3, 3) = q.setFromTwoVectors(Vec3d::UnitZ(), cross_dir).toRotationMatrix();

            m_rotation_m = m;
            m_angle_arc.reset();

            set_center(m_plane_center + cross_dir * (cross_dir.dot(pt - m_plane_center)));

            discard_cut_line_processing();
        }
        else if (action == SLAGizmoEventType::Moving)
            this->set_dirty();
        return true;
    }
    return false;
}

bool GLGizmoCut3D::gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_position, bool shift_down, bool alt_down, bool control_down)
{
    if (is_dragging() || m_connector_mode == CutConnectorMode::Auto || (!m_keep_upper || !m_keep_lower))
        return false;

    if ( m_hover_id < 0 && shift_down &&  ! m_connectors_editing &&
        (action == SLAGizmoEventType::LeftDown || action == SLAGizmoEventType::LeftUp || action == SLAGizmoEventType::Moving) )
        return process_cut_line(action, mouse_position);

    CutConnectors& connectors = m_c->selection_info()->model_object()->cut_connectors;

    if (action == SLAGizmoEventType::LeftDown && !shift_down) {
        // If there is no selection and no hovering, add new point
        if (m_hover_id == -1 && !control_down && !alt_down) {
            std::pair<Vec3d, Vec3d> pos_and_normal;
            Vec3d pos_world;
            if (unproject_on_cut_plane(mouse_position.cast<double>(), pos_and_normal, pos_world)) {
                const Vec3d& hit = pos_and_normal.first;

                if (m_connectors_editing) {

                    Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Add connector"), UndoRedo::SnapshotType::GizmoAction);

                    connectors.emplace_back(hit, Geometry::Transformation(m_rotation_m).get_rotation(), 
                                            float(m_connector_size * 0.5), float(m_connector_depth_ratio), 
                                            float(0.01f * m_connector_size_tolerance), float(0.01f * m_connector_depth_ratio_tolerance),
                                            CutConnectorAttributes( CutConnectorType(m_connector_type), 
                                                                    CutConnectorStyle(m_connector_style), 
                                                                    CutConnectorShape(m_connector_shape_id)));
                    std::fill(m_selected.begin(), m_selected.end(), false);
                    m_selected.push_back(true);
                    assert(m_selected.size() == connectors.size());
                    update_model_object();
                    m_parent.set_as_dirty();
                } else {
                    // Following would inform the clipper about the mouse click, so it can
                    // toggle the respective contour as disabled.
                    //m_c->object_clipper()->pass_mouse_click(pos_world);
                }

                return true;
            }
            return false;
        }
        return true;
    }
    else if (action == SLAGizmoEventType::LeftUp && !shift_down && m_connectors_editing) {
        if (m_hover_id >= m_connectors_group_id) {
            if (alt_down) {
                m_selected[m_hover_id - m_connectors_group_id] = false;
                --m_selected_count;
            }
            else {
                if (!control_down) {
                    std::fill(m_selected.begin(), m_selected.end(), false);
                    m_selected_count = 0;
                }
                m_selected[m_hover_id - m_connectors_group_id] = true;
                ++m_selected_count;
            }
            return true;
        }
    }
    else if (action == SLAGizmoEventType::RightDown && !shift_down && m_connectors_editing) {
        // If any point is in hover state, this should initiate its move - return control back to GLCanvas:
        if (m_hover_id < m_connectors_group_id)
            return false;

        Plater::TakeSnapshot snapshot(wxGetApp().plater(), _L("Delete connector"), UndoRedo::SnapshotType::GizmoAction);

        size_t connector_id = m_hover_id - m_connectors_group_id;
        connectors.erase(connectors.begin() + connector_id);
        m_selected.erase(m_selected.begin() + connector_id);
        assert(m_selected.size() == connectors.size());
        update_model_object();
        m_parent.set_as_dirty();

        return true;
    }
    else if (action == SLAGizmoEventType::SelectAll) {
        std::fill(m_selected.begin(), m_selected.end(), true);
        return true;
    }
    return false;
}

CommonGizmosDataID GLGizmoCut3D::on_get_requirements() const {
    return CommonGizmosDataID(
                int(CommonGizmosDataID::SelectionInfo)
              | int(CommonGizmosDataID::InstancesHider)
              | int(CommonGizmosDataID::ObjectClipper)
              | int(CommonGizmosDataID::Raycaster));
}

} // namespace GUI
} // namespace Slic3r