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9782701dd4
Attempted to get mirroring right (that never worked correctly with the clipping plane in the sla gizmo) The transformation of the support mesh is kind of a mystery to me, hopefully it is right Also cleaned the code a bit (removed commented-out code, unused variables, etc)
90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
#include "MeshClipper.hpp"
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#include "GLCanvas3D.hpp"
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#include "libslic3r/Tesselate.hpp"
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namespace Slic3r {
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namespace GUI {
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void MeshClipper::set_plane(const ClippingPlane& plane)
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{
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if (m_plane != plane) {
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m_plane = plane;
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m_triangles_valid = false;
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}
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}
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void MeshClipper::set_mesh(const TriangleMesh& mesh)
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{
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if (m_mesh != &mesh) {
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m_mesh = &mesh;
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m_triangles_valid = false;
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m_triangles2d.resize(0);
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m_triangles3d.resize(0);
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m_tms.reset(nullptr);
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}
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}
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void MeshClipper::set_transformation(const Geometry::Transformation& trafo)
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{
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if (! m_trafo.get_matrix().isApprox(trafo.get_matrix())) {
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m_trafo = trafo;
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m_triangles_valid = false;
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m_triangles2d.resize(0);
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m_triangles3d.resize(0);
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}
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}
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const std::vector<Vec3f>& MeshClipper::get_triangles()
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{
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if (! m_triangles_valid)
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recalculate_triangles();
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return m_triangles3d;
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}
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void MeshClipper::recalculate_triangles()
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{
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if (! m_tms) {
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m_tms.reset(new TriangleMeshSlicer);
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m_tms->init(m_mesh, [](){});
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}
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const Transform3f& instance_matrix_no_translation_no_scaling = m_trafo.get_matrix(true,false,true).cast<float>();
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const Vec3f& scaling = m_trafo.get_scaling_factor().cast<float>();
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// Calculate clipping plane normal in mesh coordinates.
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Vec3f up_noscale = instance_matrix_no_translation_no_scaling.inverse() * m_plane.get_normal().cast<float>();
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Vec3f up (up_noscale(0)*scaling(0), up_noscale(1)*scaling(1), up_noscale(2)*scaling(2));
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// Calculate distance from mesh origin to the clipping plane (in mesh coordinates).
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float height_mesh = m_plane.distance(m_trafo.get_offset()) * (up_noscale.norm()/up.norm());
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// Now do the cutting
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std::vector<ExPolygons> list_of_expolys;
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m_tms->set_up_direction(up);
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m_tms->slice(std::vector<float>{height_mesh}, 0.f, &list_of_expolys, [](){});
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m_triangles2d = triangulate_expolygons_2f(list_of_expolys[0], m_trafo.get_matrix().matrix().determinant() < 0.);
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// Rotate the cut into world coords:
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Eigen::Quaternionf q;
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q.setFromTwoVectors(Vec3f::UnitZ(), up);
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Transform3f tr = Transform3f::Identity();
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tr.rotate(q);
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tr = m_trafo.get_matrix().cast<float>() * tr;
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m_triangles3d.clear();
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m_triangles3d.reserve(m_triangles2d.size());
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for (const Vec2f& pt : m_triangles2d) {
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m_triangles3d.push_back(Vec3f(pt(0), pt(1), height_mesh+0.001f));
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m_triangles3d.back() = tr * m_triangles3d.back();
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}
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m_triangles_valid = true;
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}
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} // namespace GUI
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} // namespace Slic3r
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