Cut gizmo is now able to see clicks on the clipping plane

src/slic3r/GUI/Gizmos/GLGizmoCut.cpp

@@ -403,12 +403,44 @@ BoundingBoxf3 GLGizmoCut::bounding_box() const
 // }
 
 
+bool GLGizmoCut::gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_position, bool shift_down, bool alt_down, bool control_down)
+{
+    if (is_dragging())
+        return false;
+    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               = mi->get_transformation().get_matrix();
+    const Transform3d    instance_trafo_not_translate = mi->get_transformation().get_matrix(true);
+    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 hit;
+        Vec3f normal;
+        bool clipping_plane_was_hit = false;
+        m_c->raycaster()->raycasters()[mesh_id]->unproject_on_mesh(mouse_position, instance_trafo * mv->get_matrix(),
+                        camera, hit, normal, m_c->object_clipper()->get_clipping_plane(),
+                        nullptr, &clipping_plane_was_hit);
+        if (clipping_plane_was_hit) {
+            // The clipping plane was clicked, hit containts coordinates of the hit in world coords.
+            std::cout << hit.x() << "\t" << hit.y() << "\t" << hit.z() << std::endl;
+            return true;
+        }
+    }
+    return false;
+}
+
+
 
 CommonGizmosDataID GLGizmoCut::on_get_requirements() const {
     return CommonGizmosDataID(
                 int(CommonGizmosDataID::SelectionInfo)
               | int(CommonGizmosDataID::InstancesHider)
-              | int(CommonGizmosDataID::ObjectClipper));
+              | int(CommonGizmosDataID::ObjectClipper)
+              | int(CommonGizmosDataID::Raycaster));
 }
 
 } // namespace GUI

src/slic3r/GUI/Gizmos/GLGizmoCut.hpp

@@ -9,6 +9,8 @@
 namespace Slic3r {
 namespace GUI {
 
+enum class SLAGizmoEventType : unsigned char;
+
 class GLGizmoCut : public GLGizmoBase
 {
     static const double Offset;
@@ -49,6 +51,7 @@ public:
     void set_cut_z(double cut_z);
 
     std::string get_tooltip() const override;
+    bool gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_position, bool shift_down, bool alt_down, bool control_down);
 
 protected:
     bool on_init() override;

src/slic3r/GUI/Gizmos/GLGizmosManager.cpp

@@ -445,6 +445,8 @@ bool GLGizmosManager::gizmo_event(SLAGizmoEventType action, const Vec2d& mouse_p
         return dynamic_cast<GLGizmoSeam*>(m_gizmos[Seam].get())->gizmo_event(action, mouse_position, shift_down, alt_down, control_down);
     else if (m_current == MmuSegmentation)
         return dynamic_cast<GLGizmoMmuSegmentation*>(m_gizmos[MmuSegmentation].get())->gizmo_event(action, mouse_position, shift_down, alt_down, control_down);
+    else if (m_current == Cut)
+        return dynamic_cast<GLGizmoCut*>(m_gizmos[Cut].get())->gizmo_event(action, mouse_position, shift_down, alt_down, control_down);
     else
         return false;
 }
@@ -656,7 +658,7 @@ bool GLGizmosManager::on_mouse(wxMouseEvent& evt)
         m_tooltip.clear();
 
         if (evt.LeftDown() && (!control_down || grabber_contains_mouse())) {
-            if ((m_current == SlaSupports || m_current == Hollow || m_current == FdmSupports || m_current == Seam || m_current == MmuSegmentation)
+            if ((m_current == SlaSupports || m_current == Hollow || m_current == FdmSupports || m_current == Seam || m_current == MmuSegmentation || m_current == Cut)
                 && gizmo_event(SLAGizmoEventType::LeftDown, mouse_pos, evt.ShiftDown(), evt.AltDown()))
                 // the gizmo got the event and took some action, there is no need to do anything more
                 processed = true;