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SLA gizmo clipping now also triangulates the cuts on support structure

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This commit is contained in:
Lukas Matena 2019-04-15 16:20:29 +02:00
parent e8c08d8f91
commit a177a7e1da
2 changed files with 92 additions and 8 deletions
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93
src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.cpp
View File

@ -51,6 +51,9 @@ void GLGizmoSlaSupports::set_sla_support_data(ModelObject* model_object, const S
return;
}
if (m_model_object != model_object)
m_print_object_idx = -1;
m_model_object = model_object;
m_active_instance = selection.get_instance_idx();
@ -111,32 +114,91 @@ void GLGizmoSlaSupports::render_clipping_plane(const Selection& selection, const
if (m_clipping_plane_distance == 0.f)
return;
// First cache instance transformation to be used later.
const GLVolume* vol = selection.get_volume(*selection.get_volume_idxs().begin());
Transform3f instance_matrix = vol->get_instance_transformation().get_matrix().cast<float>();
Transform3f instance_matrix_no_translation_no_scaling = vol->get_instance_transformation().get_matrix(true,false,true).cast<float>();
Vec3f scaling = vol->get_instance_scaling_factor().cast<float>();
Vec3d instance_offset = vol->get_instance_offset();
// Calculate distance from mesh origin to the clipping plane (in mesh coordinates).
Vec3f up_noscale = instance_matrix_no_translation_no_scaling.inverse() * direction_to_camera.cast<float>();
Vec3f up = Vec3f(up_noscale(0)*scaling(0), up_noscale(1)*scaling(1), up_noscale(2)*scaling(2));
float height_mesh = (m_active_instance_bb_radius - m_clipping_plane_distance * 2*m_active_instance_bb_radius) * (up_noscale.norm()/up.norm());
// Get transformation of the supports and calculate how far from its origin the clipping plane is.
Transform3d supports_trafo = Transform3d::Identity();
supports_trafo = supports_trafo.rotate(Eigen::AngleAxisd(vol->get_instance_rotation()(2), Vec3d::UnitZ()));
Vec3f up_supports = (supports_trafo.inverse() * direction_to_camera).cast<float>();
supports_trafo = supports_trafo.pretranslate(Vec3d(instance_offset(0), instance_offset(1), vol->get_sla_shift_z()));
// Instance and supports origin do not coincide, so the following is quite messy:
float height_supports = height_mesh * (up.norm() / up_supports.norm()) + instance_offset(2) * (direction_to_camera(2) / direction_to_camera.norm());
// In case either of these was recently changed, the cached triangulated ExPolygons are invalid now.
// We are gonna recalculate them both for the object and for the support structures.
if (m_clipping_plane_distance != m_old_clipping_plane_distance
|| m_old_direction_to_camera != direction_to_camera) {
std::vector<ExPolygons> list_of_expolys;
m_old_direction_to_camera = direction_to_camera;
m_old_clipping_plane_distance = m_clipping_plane_distance;
// Now initialize the TMS for the object, perform the cut and save the result.
if (! m_tms) {
m_tms.reset(new TriangleMeshSlicer);
m_tms->init(const_cast<TriangleMesh*>(&m_mesh), [](){});
}
std::vector<ExPolygons> list_of_expolys;
m_tms->set_up_direction(up);
m_tms->slice(std::vector<float>{height_mesh}, 0.f, &list_of_expolys, [](){});
m_triangles = triangulate_expolygons_2f(list_of_expolys[0]);
m_old_direction_to_camera = direction_to_camera;
m_old_clipping_plane_distance = m_clipping_plane_distance;
// Next, ask the backend if supports are already calculated. If so, we are gonna cut them too.
// First we need a pointer to the respective SLAPrintObject. The index into objects vector is
// cached so we don't have todo it on each render. We only search for the po if needed:
if (m_print_object_idx < 0 || (int)m_parent.sla_print()->objects().size() != m_print_objects_count) {
m_print_objects_count = m_parent.sla_print()->objects().size();
m_print_object_idx = -1;
for (const SLAPrintObject* po : m_parent.sla_print()->objects()) {
++m_print_object_idx;
if (po->model_object()->id() == m_model_object->id())
break;
}
}
if (m_print_object_idx >= 0) {
const SLAPrintObject* print_object = m_parent.sla_print()->objects()[m_print_object_idx];
if (print_object->is_step_done(slaposSupportTree)) {
// If the supports are already calculated, save the timestamp of the respective step
// so we can later tell they were recalculated.
size_t timestamp = print_object->step_state_with_timestamp(slaposSupportTree).timestamp;
if (!m_supports_tms || (int)timestamp != m_old_timestamp) {
// The timestamp has changed - stash the mesh and initialize the TMS.
m_supports_mesh = print_object->support_mesh();
m_supports_tms.reset(new TriangleMeshSlicer);
m_supports_tms->init(const_cast<TriangleMesh*>(&m_supports_mesh), [](){});
m_old_timestamp = timestamp;
}
// The TMS is initialized - let's do the cutting:
list_of_expolys.clear();
m_supports_tms->set_up_direction(up_supports);
m_supports_tms->slice(std::vector<float>{height_supports}, 0.f, &list_of_expolys, [](){});
m_supports_triangles = triangulate_expolygons_2f(list_of_expolys[0]);
}
else {
// The supports are not valid. We better dump the cached data.
m_supports_tms.reset();
m_supports_triangles.clear();
}
}
}
// At this point we have the triangulated cuts for both the object and supports - let's render.
::glColor3f(1.0f, 0.37f, 0.0f);
if (! m_triangles.empty()) {
::glPushMatrix();
::glTranslated(0.0, 0.0, m_z_shift);
@ -146,11 +208,26 @@ void GLGizmoSlaSupports::render_clipping_plane(const Selection& selection, const
Eigen::AngleAxisf aa(q);
::glRotatef(aa.angle() * (180./M_PI), aa.axis()(0), aa.axis()(1), aa.axis()(2));
::glTranslatef(0.f, 0.f, -0.001f); // to make sure the cut is safely beyond the near clipping plane
::glColor3f(1.0f, 0.37f, 0.0f);
::glBegin(GL_TRIANGLES);
::glColor3f(1.0f, 0.37f, 0.0f);
for (const Vec2f& point : m_triangles)
::glVertex3f(point(0), point(1), height_mesh);
::glEnd();
::glPopMatrix();
}
if (! m_supports_triangles.empty()) {
::glPushMatrix();
::glMultMatrixd(supports_trafo.data());
Eigen::Quaternionf q;
q.setFromTwoVectors(Vec3f::UnitZ(), up_supports);
Eigen::AngleAxisf aa(q);
::glRotatef(aa.angle() * (180./M_PI), aa.axis()(0), aa.axis()(1), aa.axis()(2));
::glTranslatef(0.f, 0.f, -0.001f); // to make sure the cut is safely beyond the near clipping plane
::glBegin(GL_TRIANGLES);
for (const Vec2f& point : m_supports_triangles)
::glVertex3f(point(0), point(1), height_supports);
::glEnd();
::glPopMatrix();
}
@ -974,10 +1051,12 @@ void GLGizmoSlaSupports::on_set_state()
m_clipping_plane_distance = 0.f;
// Release copy of the mesh, triangle slicer and the AABB spatial search structure.
m_mesh.clear();
m_supports_mesh.clear();
m_AABB.deinit();
m_V = Eigen::MatrixXf();
m_F = Eigen::MatrixXi();
m_tms.reset(nullptr);
m_tms.reset();
m_supports_tms.reset();
});
}
m_old_state = m_state;

7
src/slic3r/GUI/Gizmos/GLGizmoSlaSupports.hpp
View File

@ -37,7 +37,12 @@ private:
Eigen::MatrixXi m_F; // facets indices
igl::AABB<Eigen::MatrixXf,3> m_AABB;
TriangleMesh m_mesh;
mutable TriangleMesh m_supports_mesh;
mutable std::vector<Vec2f> m_triangles;
mutable std::vector<Vec2f> m_supports_triangles;
mutable int m_old_timestamp = -1;
mutable int m_print_object_idx = -1;
mutable int m_print_objects_count = -1;
class CacheEntry {
public:
@ -79,7 +84,6 @@ private:
bool m_old_editing_state = false; // To keep track of whether the user toggled between the modes (needed for imgui refreshes).
float m_new_point_head_diameter; // Size of a new point.
float m_minimal_point_distance = 20.f;
float m_density = 100.f;
mutable std::vector<CacheEntry> m_editing_mode_cache; // a support point and whether it is currently selected
float m_clipping_plane_distance = 0.f;
mutable float m_old_clipping_plane_distance = 0.f;
@ -101,6 +105,7 @@ private:
int m_canvas_height;
mutable std::unique_ptr<TriangleMeshSlicer> m_tms;
mutable std::unique_ptr<TriangleMeshSlicer> m_supports_tms;
std::vector<const ConfigOption*> get_config_options(const std::vector<std::string>& keys) const;
bool is_point_clipped(const Vec3d& point, const Vec3d& direction_to_camera) const;