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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
Download patch file Download diff file Expand all files Collapse all files

126
src/libslic3r/Format/OBJ.cpp
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@ -19,7 +19,8 @@ namespace Slic3r {
bool load_obj(const char *path, TriangleMesh *meshptr)
{
if(meshptr == nullptr) return false;
if (meshptr == nullptr)
return false;
// Parse the OBJ file.
ObjParser::ObjData data;
@ -31,84 +32,69 @@ bool load_obj(const char *path, TriangleMesh *meshptr)
// Count the faces and verify, that all faces are triangular.
size_t num_faces = 0;
size_t num_quads = 0;
for (size_t i = 0; i < data.vertices.size(); ) {
for (size_t i = 0; i < data.vertices.size(); ++ i) {
// Find the end of face.
size_t j = i;
for (; j < data.vertices.size() && data.vertices[j].coordIdx != -1; ++ j) ;
if (i == j)
continue;
size_t face_vertices = j - i;
if (face_vertices != 3 && face_vertices != 4) {
// Non-triangular and non-quad faces are not supported as of now.
return false;
if (size_t num_face_vertices = j - i; num_face_vertices > 0) {
if (num_face_vertices > 4) {
// Non-triangular and non-quad faces are not supported as of now.
BOOST_LOG_TRIVIAL(error) << "load_obj: failed to parse " << path << ". The file contains polygons with more than 4 vertices.";
return false;
} else if (num_face_vertices < 3) {
// Non-triangular and non-quad faces are not supported as of now.
BOOST_LOG_TRIVIAL(error) << "load_obj: failed to parse " << path << ". The file contains polygons with less than 2 vertices.";
return false;
}
if (num_face_vertices == 4)
++ num_quads;
++ num_faces;
i = j;
}
if (face_vertices == 4)
++ num_quads;
++ num_faces;
i = j + 1;
}
// Convert ObjData into STL.
TriangleMesh &mesh = *meshptr;
stl_file &stl = mesh.stl;
stl.stats.type = inmemory;
stl.stats.number_of_facets = uint32_t(num_faces + num_quads);
stl.stats.original_num_facets = int(num_faces + num_quads);
// stl_allocate clears all the allocated data to zero, all normals are set to zeros as well.
stl_allocate(&stl);
size_t i_face = 0;
for (size_t i = 0; i < data.vertices.size(); ++ i) {
if (data.vertices[i].coordIdx == -1)
continue;
stl_facet &facet = stl.facet_start[i_face ++];
size_t num_normals = 0;
stl_normal normal(stl_normal::Zero());
for (unsigned int v = 0; v < 3; ++ v) {
const ObjParser::ObjVertex &vertex = data.vertices[i++];
memcpy(facet.vertex[v].data(), &data.coordinates[vertex.coordIdx*4], 3 * sizeof(float));
if (vertex.normalIdx != -1) {
normal(0) += data.normals[vertex.normalIdx*3];
normal(1) += data.normals[vertex.normalIdx*3+1];
normal(2) += data.normals[vertex.normalIdx*3+2];
++ num_normals;
}
}
// Result of obj_parseline() call is not checked, thus not all vertices are necessarily finalized with coord_Idx == -1.
if (i < data.vertices.size() && data.vertices[i].coordIdx != -1) {
// This is a quad. Produce the other triangle.
stl_facet &facet2 = stl.facet_start[i_face++];
facet2.vertex[0] = facet.vertex[0];
facet2.vertex[1] = facet.vertex[2];
const ObjParser::ObjVertex &vertex = data.vertices[i++];
memcpy(facet2.vertex[2].data(), &data.coordinates[vertex.coordIdx * 4], 3 * sizeof(float));
if (vertex.normalIdx != -1) {
normal(0) += data.normals[vertex.normalIdx*3];
normal(1) += data.normals[vertex.normalIdx*3+1];
normal(2) += data.normals[vertex.normalIdx*3+2];
++ num_normals;
}
if (num_normals == 4) {
// Normalize an average normal of a quad.
float len = facet.normal.norm();
if (len > EPSILON) {
normal /= len;
facet.normal = normal;
facet2.normal = normal;
}
}
} else if (num_normals == 3) {
// Normalize an average normal of a triangle.
float len = facet.normal.norm();
if (len > EPSILON)
facet.normal = normal / len;
}
// Convert ObjData into indexed triangle set.
indexed_triangle_set its;
size_t num_vertices = data.coordinates.size() / 4;
its.vertices.reserve(num_vertices);
its.indices.reserve(num_faces + num_quads);
for (size_t i = 0; i < num_vertices; ++ i) {
size_t j = i << 2;
its.vertices.emplace_back(data.coordinates[j], data.coordinates[j + 1], data.coordinates[j + 2]);
}
stl_get_size(&stl);
mesh.repair();
if (mesh.facets_count() == 0) {
int indices[4];
for (size_t i = 0; i < data.vertices.size();)
if (data.vertices[i].coordIdx == -1)
++ i;
else {
int cnt = 0;
while (i < data.vertices.size())
if (const ObjParser::ObjVertex &vertex = data.vertices[i ++]; vertex.coordIdx == -1) {
break;
} else {
assert(cnt < 4);
if (vertex.coordIdx < 0 || vertex.coordIdx >= its.vertices.size()) {
BOOST_LOG_TRIVIAL(error) << "load_obj: failed to parse " << path << ". The file contains invalid vertex index.";
return false;
}
indices[cnt ++] = vertex.coordIdx;
}
if (cnt) {
assert(cnt == 3 || cnt == 4);
// Insert one or two faces (triangulate a quad).
its.indices.emplace_back(indices[0], indices[1], indices[2]);
if (cnt == 4)
its.indices.emplace_back(indices[0], indices[2], indices[3]);
}
}
*meshptr = TriangleMesh(std::move(its));
if (meshptr->empty()) {
BOOST_LOG_TRIVIAL(error) << "load_obj: This OBJ file couldn't be read because it's empty. " << path;
return false;
}
if (meshptr->volume() < 0)
meshptr->flip_triangles();
return true;
}