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Filter out opposite triangle to projection during convert object to CGAL model

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Filip Sykala 2022-05-18 11:18:06 +02:00
parent abea5c95f3
commit 3864bb0b1c
1 changed files with 158 additions and 94 deletions
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234
src/libslic3r/CutSurface.cpp
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@ -66,6 +66,8 @@ using HI = CGAL::SM_Halfedge_index;
using EI = CGAL::SM_Edge_index;
using FI = CGAL::SM_Face_index;
using P3 = CGAL::Epick::Point_3;
/// <summary>
/// IntersectingElement
///
@ -146,11 +148,13 @@ struct IntersectingElement
/// <summary>
/// Convert triangle mesh model to CGAL Surface_mesh
/// Filtrate out opposite triangles
/// Add property map for source face index
/// </summary>
/// <param name="its">Model</param>
/// <param name="projection">Projection to filtrate out oposite triangles</param>
/// <returns>CGAL mesh - half edge mesh</returns>
CutMesh to_cgal(const indexed_triangle_set &its);
CutMesh to_cgal(const indexed_triangle_set &its, const ::Emboss::IProject3f & projection);
using Project = Emboss::IProjection;
/// <summary>
@ -266,39 +270,23 @@ using FaceTypeMap = CutMesh::Property_map<FI, FaceType>;
/// </summary>
/// <param name="face_type_map">[Output] property map with type of faces</param>
/// <param name="mesh">Mesh to process</param>
/// <param name="vertex_shape_map">Keep information about source element of Face
/// type</param> <param name="ecm">Dynamic Edge Constrained Map of bool</param>
/// <param name="project">projection of opoint</param>
/// <param name="vertex_shape_map">Keep information about source of created vertex</param>
/// <param name="ecm">Dynamic Edge Constrained Map of bool</param>
/// <param name="shape_mesh">Vertices of mesh made by shapes</param>
void set_face_type(FaceTypeMap &face_type_map,
const CutMesh &mesh,
const VertexShapeMap &vertex_shape_map,
const EcmType &ecm,
const Project &project,
const CutMesh &shape_mesh);
/// <summary>
/// Check orientation(normal direction) of face on mesh
/// </summary>
/// <param name="fi">Face index to inspect</param>
/// <param name="mesh">Mesh contained fi</param>
/// <param name="projection">Define direction of projection</param>
/// <returns>TRUE for cutted face otherwise FALSE</returns>
bool is_toward_projection(FI fi,
const CutMesh &mesh,
const Project &projection);
/// <summary>
/// Change FaceType from not_constrained to inside
/// For neighbor(or neighbor of neighbor of ...) of inside triangles.
/// Process only not_constrained triangles
/// </summary>
/// <param name="mesh">Corefined mesh</param>
/// <param name="projection">Projection from 2d to 3d</param>
/// <param name="face_type_map">In/Out map with faces type</param>
void flood_fill_inner(const CutMesh &mesh,
const Project &projection,
FaceTypeMap &face_type_map);
using ReductionMap = CutMesh::Property_map<VI, VI>;
@ -438,7 +426,7 @@ SurfaceCut Slic3r::cut_surface(const indexed_triangle_set &model,
const ExPolygons &shapes,
const Emboss::IProjection &projection)
{
priv::CutMesh cgal_model = priv::to_cgal(model);
priv::CutMesh cgal_model = priv::to_cgal(model, projection);
#ifdef DEBUG_OUTPUT_DIR
CGAL::IO::write_OFF(DEBUG_OUTPUT_DIR + "model.off", cgal_model); // only debug
@ -479,14 +467,14 @@ SurfaceCut Slic3r::cut_surface(const indexed_triangle_set &model,
priv::FaceTypeMap face_type_map = cgal_model.add_property_map<priv::FI, priv::FaceType>(face_type_map_name).first;
// Select inside and outside face in model
priv::set_face_type(face_type_map, cgal_model, vert_shape_map, ecm, projection, cgal_shape);
priv::set_face_type(face_type_map, cgal_model, vert_shape_map, ecm, cgal_shape);
#ifdef DEBUG_OUTPUT_DIR
priv::store(cgal_model, face_type_map, DEBUG_OUTPUT_DIR + "constrained.off"); // only debug
#endif // DEBUG_OUTPUT_DIR
priv::flood_fill_inner(cgal_model, face_type_map);
// Seed fill the other faces inside the region.
priv::flood_fill_inner(cgal_model, projection, face_type_map);
#ifdef DEBUG_OUTPUT_DIR
priv::store(cgal_model, face_type_map, DEBUG_OUTPUT_DIR + "filled.off"); // only debug
@ -663,7 +651,8 @@ indexed_triangle_set Slic3r::cut2model(const SurfaceCut &cut,
return result;
}
priv::CutMesh priv::to_cgal(const indexed_triangle_set &its)
priv::CutMesh priv::to_cgal(const indexed_triangle_set &its,
const Emboss::IProject3f &projection)
{
CutMesh result;
if (its.empty()) return result;
@ -671,18 +660,72 @@ priv::CutMesh priv::to_cgal(const indexed_triangle_set &its)
const std::vector<stl_vertex> &vertices = its.vertices;
const std::vector<stl_triangle_vertex_indices> &indices = its.indices;
size_t vertices_count = vertices.size();
size_t faces_count = indices.size();
size_t edges_count = (faces_count * 3) / 2;
std::vector<bool> use_indices(indices.size(), {false});
std::vector<bool> use_vetices(vertices.size(), {false});
size_t vertices_count = 0;
size_t faces_count = 0;
size_t edges_count = 0;
for (const auto &t : indices) {
const Vec3f &t0 = vertices[t[0]];
const Vec3f &t1 = vertices[t[1]];
const Vec3f &t2 = vertices[t[2]];
P3 a(t0.x(), t0.y(), t0.z());
P3 b(t1.x(), t1.y(), t1.z());
P3 c(t2.x(), t2.y(), t2.z());
Vec3f p_ = projection.project(t0);
P3 p{p_.x(), p_.y(), p_.z()};
// is_toward_projection
if (CGAL::orientation(a, b, c, p) == CGAL::POSITIVE) {
++faces_count;
size_t index = &t - &indices.front();
use_indices[index] = true;
size_t count_used_vertices = 0;
for (const auto vi : t) {
if (!use_vetices[vi]) {
++vertices_count;
use_vetices[vi] = true;
} else {
++count_used_vertices;
}
}
switch (count_used_vertices) {
case 3: break; // all edges are already counted
case 2: edges_count += 2; break;
case 1:
case 0: edges_count += 3; break;
default: assert(false);
}
}
}
assert(vertices_count <= vertices.size());
assert(edges_count <= (indices.size() * 3) / 2);
assert(faces_count <= indices.size());
result.reserve(vertices_count, edges_count, faces_count);
for (const stl_vertex &v : vertices)
result.add_vertex(CutMesh::Point{v.x(), v.y(), v.z()});
std::vector<size_t> to_filtrated_vertices_index(vertices.size());
size_t filtrated_vertices_index = 0;
for (size_t i = 0; i < vertices.size(); ++i)
if (use_vetices[i]) {
to_filtrated_vertices_index[i] = filtrated_vertices_index;
++filtrated_vertices_index;
}
for (const stl_triangle_vertex_indices &f : indices)
result.add_face(static_cast<VI>(f[0]),
static_cast<VI>(f[1]),
static_cast<VI>(f[2]));
for (const stl_vertex& v : vertices) {
if (!use_vetices[&v - &vertices.front()]) continue;
result.add_vertex(CutMesh::Point{v.x(), v.y(), v.z()});
}
for (const stl_triangle_vertex_indices &f : indices) {
if (!use_indices[&f - &indices.front()]) continue;
result.add_face(static_cast<VI>(to_filtrated_vertices_index[f[0]]),
static_cast<VI>(to_filtrated_vertices_index[f[1]]),
static_cast<VI>(to_filtrated_vertices_index[f[2]]));
}
return result;
}
@ -767,7 +810,6 @@ void priv::set_face_type(FaceTypeMap &face_type_map,
const CutMesh &mesh,
const VertexShapeMap &vertex_shape_map,
const EcmType &ecm,
const Project &project,
const CutMesh &shape_mesh)
{
for (const FI& fi : mesh.faces()) {
@ -839,14 +881,8 @@ void priv::set_face_type(FaceTypeMap &face_type_map,
shape_to.vertex_base == shape_from.vertex_base;
if (is_last) is_inside = true;
}
if (is_inside) {
if (is_toward_projection(fi, mesh, project))
face_type = FaceType::inside;
else
is_inside = false;
}
if (!is_inside) face_type = FaceType::outside;
face_type = (is_inside) ? FaceType::inside :
FaceType::outside;
break;
}
// next half edge index inside of face
@ -856,27 +892,7 @@ void priv::set_face_type(FaceTypeMap &face_type_map,
}
}
bool priv::is_toward_projection(FI fi,
const CutMesh &mesh,
const Project &projection)
{
using P3 = CGAL::Epick::Point_3;
HI hi = mesh.halfedge(fi);
const P3 &a = mesh.point(mesh.source(hi));
const P3 &b = mesh.point(mesh.target(hi));
const P3 &c = mesh.point(mesh.target(mesh.next(hi)));
Vec3f a_(a.x(), a.y(), a.z());
Vec3f p_ = projection.project(a_);
P3 p{p_.x(), p_.y(), p_.z()};
return CGAL::orientation(a, b, c, p) == CGAL::POSITIVE;
}
void priv::flood_fill_inner(const CutMesh &mesh,
const Project &projection,
FaceTypeMap &face_type_map)
{
std::vector<FI> process;
@ -888,30 +904,28 @@ void priv::flood_fill_inner(const CutMesh &mesh,
auto has_inside_neighbor = [&mesh, &face_type_map](FI fi) {
HI hi = mesh.halfedge(fi);
HI hi_end = hi;
auto exist_next = [&hi, &hi_end, &mesh]() -> bool {
hi = mesh.next(hi);
return hi != hi_end;
};
// loop over 3 half edges of face
do {
HI hi_opposite = mesh.opposite(hi);
// open edge doesn't have opposit half edge
if (!hi_opposite.is_valid()) {
hi = mesh.next(hi);
continue;
}
if (!hi_opposite.is_valid()) continue;
FI fi_opposite = mesh.face(hi_opposite);
if (!fi_opposite.is_valid()) continue;
if (face_type_map[fi_opposite] == FaceType::inside) return true;
hi = mesh.next(hi);
} while (hi != hi_end);
} while (exist_next());
return false;
};
for (FI fi : mesh.faces()) {
if (face_type_map[fi] != FaceType::not_constrained) continue;
if (!has_inside_neighbor(fi)) continue;
if (!is_toward_projection(fi, mesh, projection)) {
face_type_map[fi] = FaceType::outside;
continue;
}
assert(process.empty());
process.push_back(fi);
//store(mesh, face_type_map, DEBUG_OUTPUT_DIR + "progress.off");
while (!process.empty()) {
FI fi = process.back();
@ -923,25 +937,20 @@ void priv::flood_fill_inner(const CutMesh &mesh,
// check neighbor triangle
HI hi = mesh.halfedge(fi);
HI hi_end = hi;
auto exist_next = [&hi, &hi_end, &mesh]() -> bool {
hi = mesh.next(hi);
return hi != hi_end;
};
do {
HI hi_opposite = mesh.opposite(hi);
// open edge doesn't have opposit half edge
if (!hi_opposite.is_valid()) {
hi = mesh.next(hi);
continue;
}
if (!hi_opposite.is_valid()) continue;
FI fi_opposite = mesh.face(hi_opposite);
if (!fi_opposite.is_valid()) continue;
FaceType &side = face_type_map[fi_opposite];
if (side == FaceType::not_constrained) {
if (is_toward_projection(fi_opposite, mesh, projection)) {
if (side == FaceType::not_constrained)
process.push_back(fi_opposite);
} else {
// Is in opposit direction
side = FaceType::outside;
}
}
hi = mesh.next(hi);
} while (hi != hi_end);
} while (exist_next());
}
}
}
@ -1031,10 +1040,16 @@ void priv::collect_surface_data(std::queue<FI> &process,
HI hi_opposite = mesh.opposite(hi);
// open edge doesn't have opposit half edge
if (!hi_opposite.is_valid()) {
outlines.push_back(hi);
hi = mesh.next(hi);
continue;
}
FI fi_opposite = mesh.face(hi_opposite);
if (!fi_opposite.is_valid()) {
outlines.push_back(hi);
hi = mesh.next(hi);
continue;
}
FaceType side = face_type_map[fi_opposite];
if (side == FaceType::inside) {
process.emplace(fi_opposite);
@ -1535,13 +1550,62 @@ static void prepare_dir(const std::string &dir) {
}
void priv::store(const CutAOIs &aois, const CutMesh &mesh, const std::string &dir) {
auto create_outline_its =
[&mesh](const std::vector<HI> &outlines) -> indexed_triangle_set {
static const float line_width = 0.1f;
indexed_triangle_set its;
its.indices.reserve(2*outlines.size());
its.vertices.reserve(outlines.size()*4);
for (HI hi : outlines) {
//FI fi = mesh.face(hi);
VI vi_a = mesh.source(hi);
VI vi_b = mesh.target(hi);
VI vi_c = mesh.target(mesh.next(hi));
P3 p3_a = mesh.point(vi_a);
P3 p3_b = mesh.point(vi_b);
P3 p3_c = mesh.point(vi_c);
Vec3f a(p3_a.x(), p3_a.y(), p3_a.z());
Vec3f b(p3_b.x(), p3_b.y(), p3_b.z());
Vec3f c(p3_c.x(), p3_c.y(), p3_c.z());
Vec3f v1 = b - a; // from a to b
v1.normalize();
Vec3f v2 = c - a; // from a to c
v2.normalize();
Vec3f norm = v1.cross(v2);
norm.normalize();
Vec3f perp_to_edge = norm.cross(v1);
perp_to_edge.normalize();
Vec3f dir = -perp_to_edge * line_width;
size_t ai = its.vertices.size();
its.vertices.push_back(a);
size_t bi = its.vertices.size();
its.vertices.push_back(b);
size_t ai2 = its.vertices.size();
its.vertices.push_back(a + dir);
size_t bi2 = its.vertices.size();
its.vertices.push_back(b + dir);
its.indices.push_back(Vec3i(ai, ai2, bi));
its.indices.push_back(Vec3i(ai2, bi2, bi));
}
return its;
};
prepare_dir(dir);
for (const auto &aoi : aois) {
size_t index = &aoi - &aois.front();
std::string file = dir + "aoi" + std::to_string(index) + ".obj";
indexed_triangle_set its = create_indexed_triangle_set(aoi.first, mesh);
its_write_obj(its, file.c_str());
// TODO: Store outline from half edge somehow
// exist some outline?
if (aoi.second.empty()) continue;
std::string file_outline = dir + "outline" + std::to_string(index) + ".obj";
indexed_triangle_set outline = create_outline_its(aoi.second);
its_write_obj(outline, file_outline.c_str());
}
}