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Apply the Belt Slicing Transform to Painted Supports and Seams

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Painted support/seam facets, support volumes, seam occlusion, MMU and fuzzy skin painting (top/bottom
and side facets) and the adaptive infill octree used trafo_centered(), or trafo() with a centre-offset
shift, while the layers were sliced with the belt rotation, remap and Z lift; they now share
PrintObject::trafo_sliced().
This commit is contained in:
Hanif Koh
2026-09-14 17:27:32 +08:00
parent 9cca3093ee
commit 5092831007
5 changed files with 26 additions and 11 deletions
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src/libslic3r/PrintObject.cpp
+7 -3
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@@ -1101,7 +1101,10 @@ std::pair<FillAdaptive::OctreePtr, FillAdaptive::OctreePtr> PrintObject::prepare
indexed_triangle_set mesh = this->model_object()->raw_indexed_triangle_set();
// Rotate mesh and build octree on it with axis-aligned (standart base) cubes.
auto to_octree = transform_to_octree().toRotationMatrix();
its_transform(mesh, to_octree * this->trafo_centered(), true);
// Overhangs below are placed at Layer::bottom_z(), which includes the belt global Z offset.
Transform3d object_trafo = this->trafo_sliced();
object_trafo.translation().z() += m_belt_global_z_offset;
its_transform(mesh, to_octree * object_trafo, true);
// Triangulate internal bridging surfaces.
std::vector<std::vector<Vec3d>> overhangs(std::max(surfaces_w_bottom_z.size(), size_t(1)));
@@ -5124,6 +5127,7 @@ static void project_triangles_to_slabs(ConstLayerPtrsAdaptor layers, const index
void PrintObject::project_and_append_custom_facets(
bool seam, EnforcerBlockerType type, std::vector<Polygons>& out, std::vector<std::pair<Vec3f, Vec3f>>* vertical_points) const
{
const Transform3d object_trafo = this->trafo_sliced();
for (const ModelVolume* mv : this->model_object()->volumes)
if (mv->is_model_part()) {
const indexed_triangle_set custom_facets = seam
@@ -5132,12 +5136,12 @@ void PrintObject::project_and_append_custom_facets(
if (! custom_facets.indices.empty()) {
if (seam)
project_triangles_to_slabs(this->layers(), custom_facets,
(this->trafo_centered() * mv->get_matrix()).cast<float>(),
(object_trafo * mv->get_matrix()).cast<float>(),
seam, out);
else {
std::vector<Polygons> projected;
// Support blockers or enforcers. Project downward facing painted areas upwards to their respective slicing plane.
slice_mesh_slabs(custom_facets, zs_from_layers(this->layers()), this->trafo_centered() * mv->get_matrix(), nullptr, &projected, vertical_points, [](){});
slice_mesh_slabs(custom_facets, zs_from_layers(this->layers()), object_trafo * mv->get_matrix(), nullptr, &projected, vertical_points, [](){});
// Merge these projections with the output, layer by layer.
assert(! projected.empty());
assert(out.empty() || out.size() == projected.size());