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Eradicated admesh from TriangleMesh:

Browse Source 
TriangleMesh newly only holds indexed_triangle_set and
TriangleMeshStats. TriangleMeshStats contains an excerpt of stl_stats.
TriangleMeshStats are updated when initializing with indexed_triangle_set.

Admesh triangle mesh fixing is newly only used when loading an STL.
AMF / 3MF / OBJ file formats are already indexed triangle sets, thus
they are no more converted to admesh stl_file format, nor fixed
through admesh repair machinery. When importing AMF / 3MF / OBJ files,
volume is calculated and if negative, all faces are flipped. Also
a bounding box and number of open edges is calculated.

Implemented its_number_of_patches(), its_num_open_edges()
Optimized its_split(), its_is_splittable() using a visitor pattern.

Reworked QHull integration into TriangleMesh:
    1) Face normals were not right.
    2) Indexed triangle set is newly emitted instead of duplicating
       vertices for each face.

Fixed cut_mesh(): Orient the triangulated faces correctly.
This commit is contained in:
Vojtech Bubnik
2021-09-20 17:12:22 +02:00
parent f484953a5a
commit 8a2a9dba2f
59 changed files with 1056 additions and 1758 deletions
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95
src/libslic3r/Format/3mf.cpp
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@@ -305,8 +305,8 @@ namespace Slic3r {
struct Geometry
{
std::vector<float> vertices;
std::vector<unsigned int> triangles;
std::vector<Vec3f> vertices;
std::vector<Vec3i> triangles;
std::vector<std::string> custom_supports;
std::vector<std::string> custom_seam;
std::vector<std::string> mmu_segmentation;
@@ -720,7 +720,7 @@ namespace Slic3r {
}
// use the geometry to create the volumes in the new model objects
ObjectMetadata::VolumeMetadataList volumes(1, { 0, (unsigned int)geometry->triangles.size() / 3 - 1 });
ObjectMetadata::VolumeMetadataList volumes(1, { 0, (unsigned int)geometry->triangles.size() - 1 });
// for each instance after the 1st, create a new model object containing only that instance
// and copy into it the geometry
@@ -793,7 +793,7 @@ namespace Slic3r {
// config data not found, this model was not saved using slic3r pe
// add the entire geometry as the single volume to generate
volumes.emplace_back(0, (int)obj_geometry->second.triangles.size() / 3 - 1);
volumes.emplace_back(0, (int)obj_geometry->second.triangles.size() - 1);
// select as volumes
volumes_ptr = &volumes;
@@ -1559,9 +1559,10 @@ namespace Slic3r {
{
// appends the vertex coordinates
// missing values are set equal to ZERO
m_curr_object.geometry.vertices.push_back(m_unit_factor * get_attribute_value_float(attributes, num_attributes, X_ATTR));
m_curr_object.geometry.vertices.push_back(m_unit_factor * get_attribute_value_float(attributes, num_attributes, Y_ATTR));
m_curr_object.geometry.vertices.push_back(m_unit_factor * get_attribute_value_float(attributes, num_attributes, Z_ATTR));
m_curr_object.geometry.vertices.emplace_back(
m_unit_factor * get_attribute_value_float(attributes, num_attributes, X_ATTR),
m_unit_factor * get_attribute_value_float(attributes, num_attributes, Y_ATTR),
m_unit_factor * get_attribute_value_float(attributes, num_attributes, Z_ATTR));
return true;
}
@@ -1595,9 +1596,10 @@ namespace Slic3r {
// appends the triangle's vertices indices
// missing values are set equal to ZERO
m_curr_object.geometry.triangles.push_back((unsigned int)get_attribute_value_int(attributes, num_attributes, V1_ATTR));
m_curr_object.geometry.triangles.push_back((unsigned int)get_attribute_value_int(attributes, num_attributes, V2_ATTR));
m_curr_object.geometry.triangles.push_back((unsigned int)get_attribute_value_int(attributes, num_attributes, V3_ATTR));
m_curr_object.geometry.triangles.emplace_back(
get_attribute_value_int(attributes, num_attributes, V1_ATTR),
get_attribute_value_int(attributes, num_attributes, V2_ATTR),
get_attribute_value_int(attributes, num_attributes, V3_ATTR));
m_curr_object.geometry.custom_supports.push_back(get_attribute_value_string(attributes, num_attributes, CUSTOM_SUPPORTS_ATTR));
m_curr_object.geometry.custom_seam.push_back(get_attribute_value_string(attributes, num_attributes, CUSTOM_SEAM_ATTR));
@@ -1886,7 +1888,7 @@ namespace Slic3r {
return false;
}
unsigned int geo_tri_count = (unsigned int)geometry.triangles.size() / 3;
unsigned int geo_tri_count = (unsigned int)geometry.triangles.size();
unsigned int renamed_volumes_count = 0;
for (const ObjectMetadata::VolumeMetadata& volume_data : volumes) {
@@ -1897,77 +1899,50 @@ namespace Slic3r {
Transform3d volume_matrix_to_object = Transform3d::Identity();
bool has_transform = false;
#if ENABLE_FIX_MIRRORED_VOLUMES_3MF_IMPORT_EXPORT
bool is_left_handed = false;
#endif // ENABLE_FIX_MIRRORED_VOLUMES_3MF_IMPORT_EXPORT
// extract the volume transformation from the volume's metadata, if present
for (const Metadata& metadata : volume_data.metadata) {
if (metadata.key == MATRIX_KEY) {
volume_matrix_to_object = Slic3r::Geometry::transform3d_from_string(metadata.value);
has_transform = ! volume_matrix_to_object.isApprox(Transform3d::Identity(), 1e-10);
#if ENABLE_FIX_MIRRORED_VOLUMES_3MF_IMPORT_EXPORT
is_left_handed = Slic3r::Geometry::Transformation(volume_matrix_to_object).is_left_handed();
#endif // ENABLE_FIX_MIRRORED_VOLUMES_3MF_IMPORT_EXPORT
break;
}
}
// splits volume out of imported geometry
TriangleMesh triangle_mesh;
stl_file &stl = triangle_mesh.stl;
unsigned int triangles_count = volume_data.last_triangle_id - volume_data.first_triangle_id + 1;
stl.stats.type = inmemory;
stl.stats.number_of_facets = (uint32_t)triangles_count;
stl.stats.original_num_facets = (int)stl.stats.number_of_facets;
stl_allocate(&stl);
unsigned int src_start_id = volume_data.first_triangle_id * 3;
for (unsigned int i = 0; i < triangles_count; ++i) {
unsigned int ii = i * 3;
stl_facet& facet = stl.facet_start[i];
for (unsigned int v = 0; v < 3; ++v) {
unsigned int tri_id = geometry.triangles[src_start_id + ii + v] * 3;
if (tri_id + 2 >= geometry.vertices.size()) {
add_error("Malformed triangle mesh");
std::vector<Vec3i> faces(geometry.triangles.begin() + volume_data.first_triangle_id, geometry.triangles.begin() + volume_data.last_triangle_id + 1);
const size_t triangles_count = faces.size();
for (Vec3i face : faces)
for (unsigned int tri_id : face)
if (tri_id < 0 || tri_id >= geometry.vertices.size()) {
add_error("Found invalid vertex id");
return false;
}
facet.vertex[v] = Vec3f(geometry.vertices[tri_id + 0], geometry.vertices[tri_id + 1], geometry.vertices[tri_id + 2]);
}
}
stl_get_size(&stl);
triangle_mesh.repair();
#if ENABLE_FIX_MIRRORED_VOLUMES_3MF_IMPORT_EXPORT
// PrusaSlicer older than 2.4.0 saved mirrored volumes with reversed winding of the triangles
// This caused the call to TriangleMesh::repair() to reverse all the facets because the calculated volume was negative
if (is_left_handed && stl.stats.facets_reversed > 0 && stl.stats.facets_reversed == stl.stats.original_num_facets)
stl.stats.facets_reversed = 0;
#endif // ENABLE_FIX_MIRRORED_VOLUMES_3MF_IMPORT_EXPORT
TriangleMesh triangle_mesh(std::move(geometry.vertices), std::move(faces));
if (m_version == 0) {
// if the 3mf was not produced by PrusaSlicer and there is only one instance,
// bake the transformation into the geometry to allow the reload from disk command
// to work properly
if (object.instances.size() == 1) {
triangle_mesh.transform(object.instances.front()->get_transformation().get_matrix());
triangle_mesh.transform(object.instances.front()->get_transformation().get_matrix(), false);
object.instances.front()->set_transformation(Slic3r::Geometry::Transformation());
//FIXME do the mesh fixing?
}
}
if (triangle_mesh.volume() < 0)
triangle_mesh.flip_triangles();
ModelVolume* volume = object.add_volume(std::move(triangle_mesh));
// stores the volume matrix taken from the metadata, if present
if (has_transform)
volume->source.transform = Slic3r::Geometry::Transformation(volume_matrix_to_object);
volume->calculate_convex_hull();
// recreate custom supports, seam and mmu segmentation from previously loaded attribute
volume->supported_facets.reserve(triangles_count);
volume->seam_facets.reserve(triangles_count);
volume->mmu_segmentation_facets.reserve(triangles_count);
for (unsigned i=0; i<triangles_count; ++i) {
size_t index = src_start_id/3 + i;
for (size_t i=0; i<triangles_count; ++i) {
size_t index = volume_data.first_triangle_id + i;
assert(index < geometry.custom_supports.size());
assert(index < geometry.custom_seam.size());
assert(index < geometry.mmu_segmentation.size());
@@ -2543,11 +2518,6 @@ namespace Slic3r {
if (volume == nullptr)
continue;
if (!volume->mesh().repaired)
throw Slic3r::FileIOError("store_3mf() requires repair()");
if (!volume->mesh().has_shared_vertices())
throw Slic3r::FileIOError("store_3mf() requires shared vertices");
volumes_offsets.insert({ volume, Offsets(vertices_count) });
const indexed_triangle_set &its = volume->mesh().its;
@@ -2588,10 +2558,7 @@ namespace Slic3r {
if (volume == nullptr)
continue;
#if ENABLE_FIX_MIRRORED_VOLUMES_3MF_IMPORT_EXPORT
bool is_left_handed = volume->is_left_handed();
#endif // ENABLE_FIX_MIRRORED_VOLUMES_3MF_IMPORT_EXPORT
VolumeToOffsetsMap::iterator volume_it = volumes_offsets.find(volume);
assert(volume_it != volumes_offsets.end());
@@ -2606,7 +2573,6 @@ namespace Slic3r {
{
const Vec3i &idx = its.indices[i];
char *ptr = buf;
#if ENABLE_FIX_MIRRORED_VOLUMES_3MF_IMPORT_EXPORT
boost::spirit::karma::generate(ptr, boost::spirit::lit(" <") << TRIANGLE_TAG <<
" v1=\"" << boost::spirit::int_ <<
"\" v2=\"" << boost::spirit::int_ <<
@@ -2614,15 +2580,6 @@ namespace Slic3r {
idx[is_left_handed ? 2 : 0] + volume_it->second.first_vertex_id,
idx[1] + volume_it->second.first_vertex_id,
idx[is_left_handed ? 0 : 2] + volume_it->second.first_vertex_id);
#else
boost::spirit::karma::generate(ptr, boost::spirit::lit(" <") << TRIANGLE_TAG <<
" v1=\"" << boost::spirit::int_ <<
"\" v2=\"" << boost::spirit::int_ <<
"\" v3=\"" << boost::spirit::int_ << "\"",
idx[0] + volume_it->second.first_vertex_id,
idx[1] + volume_it->second.first_vertex_id,
idx[2] + volume_it->second.first_vertex_id);
#endif // ENABLE_FIX_MIRRORED_VOLUMES_3MF_IMPORT_EXPORT
*ptr = '\0';
output_buffer += buf;
}