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blender/extern/carve/carve-util.cc
Sergey Sharybin 1a9217e222 Fix T52763: Boolean problem with vertex group
2017-09-15 16:33:52 +05:00

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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2014 Blender Foundation.
* All rights reserved.
*
* Contributor(s): Blender Foundation,
* Sergey Sharybin
*
* ***** END GPL LICENSE BLOCK *****
*/
#include "carve-util.h"
#include "carve-capi.h"
#include <cfloat>
#include <carve/csg.hpp>
#include <carve/csg_triangulator.hpp>
#include <carve/rtree.hpp>
using carve::csg::Intersections;
using carve::geom::aabb;
using carve::geom::RTreeNode;
using carve::geom3d::Vector;
using carve::math::Matrix3;
using carve::mesh::Face;
using carve::mesh::MeshSet;
using carve::triangulate::tri_idx;
using carve::triangulate::triangulate;
typedef std::map< MeshSet<3>::mesh_t*, RTreeNode<3, Face<3> *> * > RTreeCache;
typedef std::map< MeshSet<3>::mesh_t*, bool > IntersectCache;
namespace {
// Functions adopted from BLI_math.h to use Carve Vector and Matrix.
void transpose_m3__bli(double mat[3][3])
{
double t;
t = mat[0][1];
mat[0][1] = mat[1][0];
mat[1][0] = t;
t = mat[0][2];
mat[0][2] = mat[2][0];
mat[2][0] = t;
t = mat[1][2];
mat[1][2] = mat[2][1];
mat[2][1] = t;
}
void ortho_basis_v3v3_v3__bli(double r_n1[3], double r_n2[3], const double n[3])
{
const double eps = FLT_EPSILON;
const double f = (n[0] * n[0]) + (n[1] * n[1]);
if (f > eps) {
const double d = 1.0f / sqrt(f);
r_n1[0] = n[1] * d;
r_n1[1] = -n[0] * d;
r_n1[2] = 0.0f;
r_n2[0] = -n[2] * r_n1[1];
r_n2[1] = n[2] * r_n1[0];
r_n2[2] = n[0] * r_n1[1] - n[1] * r_n1[0];
}
else {
/* degenerate case */
r_n1[0] = (n[2] < 0.0f) ? -1.0f : 1.0f;
r_n1[1] = r_n1[2] = r_n2[0] = r_n2[2] = 0.0f;
r_n2[1] = 1.0f;
}
}
void axis_dominant_v3_to_m3__bli(Matrix3 *r_mat, const Vector &normal)
{
memcpy(r_mat->m[2], normal.v, sizeof(double[3]));
ortho_basis_v3v3_v3__bli(r_mat->m[0], r_mat->m[1], r_mat->m[2]);
transpose_m3__bli(r_mat->m);
}
void meshset_minmax(const MeshSet<3> *mesh,
Vector *min,
Vector *max)
{
for (size_t i = 0; i < mesh->vertex_storage.size(); ++i) {
min->x = std::min(min->x, mesh->vertex_storage[i].v.x);
min->y = std::min(min->y, mesh->vertex_storage[i].v.y);
min->z = std::min(min->z, mesh->vertex_storage[i].v.z);
max->x = std::max(max->x, mesh->vertex_storage[i].v.x);
max->y = std::max(max->y, mesh->vertex_storage[i].v.y);
max->z = std::max(max->z, mesh->vertex_storage[i].v.z);
}
}
} // namespace
void carve_getRescaleMinMax(const MeshSet<3> *left,
const MeshSet<3> *right,
Vector *min,
Vector *max)
{
min->x = max->x = left->vertex_storage[0].v.x;
min->y = max->y = left->vertex_storage[0].v.y;
min->z = max->z = left->vertex_storage[0].v.z;
meshset_minmax(left, min, max);
meshset_minmax(right, min, max);
// Make sure we don't scale object with zero scale.
if (std::abs(min->x - max->x) < carve::EPSILON) {
min->x = -1.0;
max->x = 1.0;
}
if (std::abs(min->y - max->y) < carve::EPSILON) {
min->y = -1.0;
max->y = 1.0;
}
if (std::abs(min->z - max->z) < carve::EPSILON) {
min->z = -1.0;
max->z = 1.0;
}
}
namespace {
struct UnionIntersectionContext {
VertexAttrsCallback vertex_attr_callback;
void *user_data;
};
void copyMeshes(const std::vector<MeshSet<3>::mesh_t*> &meshes,
std::vector<MeshSet<3>::mesh_t*> *new_meshes)
{
std::vector<MeshSet<3>::mesh_t*>::const_iterator it = meshes.begin();
new_meshes->reserve(meshes.size());
for (; it != meshes.end(); it++) {
MeshSet<3>::mesh_t *mesh = *it;
MeshSet<3>::mesh_t *new_mesh = new MeshSet<3>::mesh_t(mesh->faces);
new_meshes->push_back(new_mesh);
}
}
struct NewMeshMapping {
std::map<const MeshSet<3>::edge_t*, MeshSet<3>::vertex_t*> orig_edge_vert;
};
void prepareNewMeshMapping(const std::vector<MeshSet<3>::mesh_t*> &meshes,
NewMeshMapping *mapping)
{
for (size_t m = 0; m < meshes.size(); ++m) {
MeshSet<3>::mesh_t *mesh = meshes[m];
for (size_t f = 0; f < mesh->faces.size(); ++f) {
MeshSet<3>::face_t *face = mesh->faces[f];
MeshSet<3>::edge_t *edge = face->edge;
do {
mapping->orig_edge_vert[edge] = edge->vert;
edge = edge->next;
} while (edge != face->edge);
}
}
}
void runNewMeshSetHooks(UnionIntersectionContext *ctx,
NewMeshMapping *mapping,
MeshSet<3> *mesh_set)
{
for (size_t m = 0; m < mesh_set->meshes.size(); ++m) {
MeshSet<3>::mesh_t *mesh = mesh_set->meshes[m];
for (size_t f = 0; f < mesh->faces.size(); ++f) {
MeshSet<3>::face_t *face = mesh->faces[f];
MeshSet<3>::edge_t *edge = face->edge;
do {
const MeshSet<3>::vertex_t *orig_vert = mapping->orig_edge_vert[edge];
const MeshSet<3>::vertex_t *new_vert = edge->vert;
ctx->vertex_attr_callback(orig_vert, new_vert, ctx->user_data);
edge = edge->next;
} while (edge != face->edge);
}
}
}
MeshSet<3> *newMeshSetFromMeshesWithAttrs(
UnionIntersectionContext *ctx,
std::vector<MeshSet<3>::mesh_t*> &meshes)
{
NewMeshMapping mapping;
prepareNewMeshMapping(meshes, &mapping);
MeshSet<3> *mesh_set = new MeshSet<3>(meshes);
runNewMeshSetHooks(ctx, &mapping, mesh_set);
return mesh_set;
}
MeshSet<3> *meshSetFromMeshes(UnionIntersectionContext *ctx,
const std::vector<MeshSet<3>::mesh_t*> &meshes)
{
std::vector<MeshSet<3>::mesh_t*> new_meshes;
copyMeshes(meshes, &new_meshes);
return newMeshSetFromMeshesWithAttrs(ctx, new_meshes);
}
MeshSet<3> *meshSetFromTwoMeshes(UnionIntersectionContext *ctx,
const std::vector<MeshSet<3>::mesh_t*> &left_meshes,
const std::vector<MeshSet<3>::mesh_t*> &right_meshes)
{
std::vector<MeshSet<3>::mesh_t*> new_meshes;
copyMeshes(left_meshes, &new_meshes);
copyMeshes(right_meshes, &new_meshes);
return newMeshSetFromMeshesWithAttrs(ctx, new_meshes);
}
bool checkEdgeFaceIntersections_do(Intersections &intersections,
MeshSet<3>::face_t *face_a,
MeshSet<3>::edge_t *edge_b)
{
if (intersections.intersects(edge_b, face_a))
return true;
carve::mesh::MeshSet<3>::vertex_t::vector_t _p;
if (face_a->simpleLineSegmentIntersection(carve::geom3d::LineSegment(edge_b->v1()->v, edge_b->v2()->v), _p))
return true;
return false;
}
bool checkEdgeFaceIntersections(Intersections &intersections,
MeshSet<3>::face_t *face_a,
MeshSet<3>::face_t *face_b)
{
MeshSet<3>::edge_t *edge_b;
edge_b = face_b->edge;
do {
if (checkEdgeFaceIntersections_do(intersections, face_a, edge_b))
return true;
edge_b = edge_b->next;
} while (edge_b != face_b->edge);
return false;
}
inline bool facesAreCoplanar(const MeshSet<3>::face_t *a, const MeshSet<3>::face_t *b)
{
carve::geom3d::Ray temp;
// XXX: Find a better definition. This may be a source of problems
// if floating point inaccuracies cause an incorrect answer.
return !carve::geom3d::planeIntersection(a->plane, b->plane, temp);
}
bool checkMeshSetInterseciton_do(Intersections &intersections,
const RTreeNode<3, Face<3> *> *a_node,
const RTreeNode<3, Face<3> *> *b_node,
bool descend_a = true)
{
if (!a_node->bbox.intersects(b_node->bbox)) {
return false;
}
if (a_node->child && (descend_a || !b_node->child)) {
for (RTreeNode<3, Face<3> *> *node = a_node->child; node; node = node->sibling) {
if (checkMeshSetInterseciton_do(intersections, node, b_node, false)) {
return true;
}
}
}
else if (b_node->child) {
for (RTreeNode<3, Face<3> *> *node = b_node->child; node; node = node->sibling) {
if (checkMeshSetInterseciton_do(intersections, a_node, node, true)) {
return true;
}
}
}
else {
for (size_t i = 0; i < a_node->data.size(); ++i) {
MeshSet<3>::face_t *fa = a_node->data[i];
aabb<3> aabb_a = fa->getAABB();
if (aabb_a.maxAxisSeparation(b_node->bbox) > carve::EPSILON) {
continue;
}
for (size_t j = 0; j < b_node->data.size(); ++j) {
MeshSet<3>::face_t *fb = b_node->data[j];
aabb<3> aabb_b = fb->getAABB();
if (aabb_b.maxAxisSeparation(aabb_a) > carve::EPSILON) {
continue;
}
std::pair<double, double> a_ra = fa->rangeInDirection(fa->plane.N, fa->edge->vert->v);
std::pair<double, double> b_ra = fb->rangeInDirection(fa->plane.N, fa->edge->vert->v);
if (carve::rangeSeparation(a_ra, b_ra) > carve::EPSILON) {
continue;
}
std::pair<double, double> a_rb = fa->rangeInDirection(fb->plane.N, fb->edge->vert->v);
std::pair<double, double> b_rb = fb->rangeInDirection(fb->plane.N, fb->edge->vert->v);
if (carve::rangeSeparation(a_rb, b_rb) > carve::EPSILON) {
continue;
}
if (!facesAreCoplanar(fa, fb)) {
if (checkEdgeFaceIntersections(intersections, fa, fb)) {
return true;
}
}
}
}
}
return false;
}
bool checkMeshSetInterseciton(RTreeNode<3, Face<3> *> *rtree_a, RTreeNode<3, Face<3> *> *rtree_b)
{
Intersections intersections;
return checkMeshSetInterseciton_do(intersections, rtree_a, rtree_b);
}
void getIntersectedOperandMeshes(std::vector<MeshSet<3>::mesh_t*> *meshes,
const MeshSet<3>::aabb_t &otherAABB,
std::vector<MeshSet<3>::mesh_t*> *operandMeshes,
RTreeCache *rtree_cache,
IntersectCache *intersect_cache)
{
std::vector<MeshSet<3>::mesh_t*>::iterator it = meshes->begin();
std::vector< RTreeNode<3, Face<3> *> *> meshRTree;
while (it != meshes->end()) {
MeshSet<3>::mesh_t *mesh = *it;
bool isAdded = false;
RTreeNode<3, Face<3> *> *rtree;
bool intersects;
RTreeCache::iterator rtree_found = rtree_cache->find(mesh);
if (rtree_found != rtree_cache->end()) {
rtree = rtree_found->second;
}
else {
rtree = RTreeNode<3, Face<3> *>::construct_STR(mesh->faces.begin(), mesh->faces.end(), 4, 4);
(*rtree_cache)[mesh] = rtree;
}
IntersectCache::iterator intersect_found = intersect_cache->find(mesh);
if (intersect_found != intersect_cache->end()) {
intersects = intersect_found->second;
}
else {
intersects = rtree->bbox.intersects(otherAABB);
(*intersect_cache)[mesh] = intersects;
}
if (intersects) {
bool isIntersect = false;
std::vector<MeshSet<3>::mesh_t*>::iterator operand_it = operandMeshes->begin();
std::vector<RTreeNode<3, Face<3> *> *>::iterator tree_it = meshRTree.begin();
for (; operand_it!=operandMeshes->end(); operand_it++, tree_it++) {
RTreeNode<3, Face<3> *> *operandRTree = *tree_it;
if (checkMeshSetInterseciton(rtree, operandRTree)) {
isIntersect = true;
break;
}
}
if (!isIntersect) {
operandMeshes->push_back(mesh);
meshRTree.push_back(rtree);
it = meshes->erase(it);
isAdded = true;
}
}
if (!isAdded) {
//delete rtree;
it++;
}
}
std::vector<RTreeNode<3, Face<3> *> *>::iterator tree_it = meshRTree.begin();
for (; tree_it != meshRTree.end(); tree_it++) {
//delete *tree_it;
}
}
MeshSet<3> *getIntersectedOperand(UnionIntersectionContext *ctx,
std::vector<MeshSet<3>::mesh_t*> *meshes,
const MeshSet<3>::aabb_t &otherAABB,
RTreeCache *rtree_cache,
IntersectCache *intersect_cache)
{
std::vector<MeshSet<3>::mesh_t*> operandMeshes;
getIntersectedOperandMeshes(meshes, otherAABB, &operandMeshes, rtree_cache, intersect_cache);
if (operandMeshes.size() == 0)
return NULL;
return meshSetFromMeshes(ctx, operandMeshes);
}
MeshSet<3> *unionIntersectingMeshes(carve::csg::CSG *csg,
MeshSet<3> *poly,
const MeshSet<3> *other_poly,
const MeshSet<3>::aabb_t &otherAABB,
VertexAttrsCallback vertex_attr_callback,
UnionIntersectionsCallback callback,
void *user_data)
{
if (poly->meshes.size() <= 1) {
return poly;
}
std::vector<MeshSet<3>::mesh_t*> orig_meshes =
std::vector<MeshSet<3>::mesh_t*>(poly->meshes.begin(), poly->meshes.end());
RTreeCache rtree_cache;
IntersectCache intersect_cache;
UnionIntersectionContext ctx;
ctx.vertex_attr_callback = vertex_attr_callback;
ctx.user_data = user_data;
MeshSet<3> *left = getIntersectedOperand(&ctx,
&orig_meshes,
otherAABB,
&rtree_cache,
&intersect_cache);
if (!left) {
// No maniforlds which intersects another object at all.
return poly;
}
while (orig_meshes.size()) {
MeshSet<3> *right = getIntersectedOperand(&ctx,
&orig_meshes,
otherAABB,
&rtree_cache,
&intersect_cache);
if (!right) {
// No more intersecting manifolds which intersects other object
break;
}
try {
if (left->meshes.size()==0) {
delete left;
left = right;
}
else {
MeshSet<3> *result = csg->compute(left, right,
carve::csg::CSG::UNION,
NULL, carve::csg::CSG::CLASSIFY_EDGE);
callback(result, other_poly, user_data);
delete left;
delete right;
left = result;
}
}
catch (carve::exception e) {
std::cerr << "CSG failed, exception " << e.str() << std::endl;
MeshSet<3> *result = meshSetFromTwoMeshes(&ctx,
left->meshes,
right->meshes);
callback(result, other_poly, user_data);
delete left;
delete right;
left = result;
}
catch (...) {
delete left;
delete right;
throw "Unknown error in Carve library";
}
}
for (RTreeCache::iterator it = rtree_cache.begin();
it != rtree_cache.end();
it++)
{
delete it->second;
}
// Append all meshes which doesn't have intersection with another operand as-is.
if (orig_meshes.size()) {
MeshSet<3> *result = meshSetFromTwoMeshes(&ctx,
left->meshes,
orig_meshes);
delete left;
left = result;
}
return left;
}
} // namespace
// TODO(sergey): This function is to be totally re-implemented to make it
// more clear what's going on and hopefully optimize it as well.
void carve_unionIntersections(carve::csg::CSG *csg,
MeshSet<3> **left_r,
MeshSet<3> **right_r,
VertexAttrsCallback vertex_attr_callback,
UnionIntersectionsCallback callback,
void *user_data)
{
MeshSet<3> *left = *left_r, *right = *right_r;
if (left->meshes.size() == 1 && right->meshes.size() == 0) {
return;
}
MeshSet<3>::aabb_t leftAABB = left->getAABB();
MeshSet<3>::aabb_t rightAABB = right->getAABB();;
left = unionIntersectingMeshes(csg, left, right, rightAABB,
vertex_attr_callback, callback, user_data);
right = unionIntersectingMeshes(csg, right, left, leftAABB,
vertex_attr_callback, callback, user_data);
if (left != *left_r) {
delete *left_r;
}
if (right != *right_r) {
delete *right_r;
}
*left_r = left;
*right_r = right;
}
static inline void add_newell_cross_v3_v3v3(const Vector &v_prev,
const Vector &v_curr,
Vector *n)
{
(*n)[0] += (v_prev[1] - v_curr[1]) * (v_prev[2] + v_curr[2]);
(*n)[1] += (v_prev[2] - v_curr[2]) * (v_prev[0] + v_curr[0]);
(*n)[2] += (v_prev[0] - v_curr[0]) * (v_prev[1] + v_curr[1]);
}
// Axis matrix is being set for non-flat ngons only.
bool carve_checkPolyPlanarAndGetNormal(const std::vector<MeshSet<3>::vertex_t> &vertex_storage,
const int verts_per_poly,
const int *verts_of_poly,
Matrix3 *axis_matrix_r)
{
if (verts_per_poly == 3) {
// Triangles are always planar.
return true;
}
else if (verts_per_poly == 4) {
// Presumably faster than using generig n-gon check for quads.
const Vector &v1 = vertex_storage[verts_of_poly[0]].v,
&v2 = vertex_storage[verts_of_poly[1]].v,
&v3 = vertex_storage[verts_of_poly[2]].v,
&v4 = vertex_storage[verts_of_poly[3]].v;
Vector vec1, vec2, vec3, cross;
vec1 = v2 - v1;
vec2 = v4 - v1;
vec3 = v3 - v1;
cross = carve::geom::cross(vec1, vec2);
double production = carve::geom::dot(cross, vec3);
// TODO(sergey): Check on whether we could have length-independent
// magnitude here.
double magnitude = 1e-3 * cross.length2();
return fabs(production) < magnitude;
}
else {
const Vector *vert_prev = &vertex_storage[verts_of_poly[verts_per_poly - 1]].v;
const Vector *vert_curr = &vertex_storage[verts_of_poly[0]].v;
Vector normal = carve::geom::VECTOR(0.0, 0.0, 0.0);
for (int i = 0; i < verts_per_poly; i++) {
add_newell_cross_v3_v3v3(*vert_prev, *vert_curr, &normal);
vert_prev = vert_curr;
vert_curr = &vertex_storage[verts_of_poly[(i + 1) % verts_per_poly]].v;
}
if (normal.length2() < FLT_EPSILON) {
// Degenerated face, couldn't triangulate properly anyway.
return true;
}
else {
double magnitude = normal.length2();
normal.normalize();
axis_dominant_v3_to_m3__bli(axis_matrix_r, normal);
Vector first_projected = *axis_matrix_r * vertex_storage[verts_of_poly[0]].v;
double min_z = first_projected[2], max_z = first_projected[2];
for (int i = 1; i < verts_per_poly; i++) {
const Vector &vertex = vertex_storage[verts_of_poly[i]].v;
Vector projected = *axis_matrix_r * vertex;
if (projected[2] < min_z) {
min_z = projected[2];
}
if (projected[2] > max_z) {
max_z = projected[2];
}
}
if (std::abs(min_z - max_z) > FLT_EPSILON * magnitude) {
return false;
}
}
return true;
}
return false;
}
namespace {
int triangulateNGon_carveTriangulator(const std::vector<MeshSet<3>::vertex_t> &vertex_storage,
const int verts_per_poly,
const int *verts_of_poly,
const Matrix3 &axis_matrix,
std::vector<tri_idx> *triangles)
{
// Project vertices to 2D plane.
Vector projected;
std::vector<carve::geom::vector<2> > poly_2d;
poly_2d.reserve(verts_per_poly);
for (int i = 0; i < verts_per_poly; ++i) {
projected = axis_matrix * vertex_storage[verts_of_poly[i]].v;
poly_2d.push_back(carve::geom::VECTOR(projected[0], projected[1]));
}
carve::triangulate::triangulate(poly_2d, *triangles);
carve::triangulate::improve(poly_2d, *triangles);
return triangles->size();
}
int triangulateNGon_importerTriangulator(struct ImportMeshData *import_data,
CarveMeshImporter *mesh_importer,
const std::vector<MeshSet<3>::vertex_t> &vertex_storage,
const int verts_per_poly,
const int *verts_of_poly,
const Matrix3 &axis_matrix,
std::vector<tri_idx> *triangles)
{
typedef float Vector2D[2];
typedef unsigned int Triangle[3];
// Project vertices to 2D plane.
Vector2D *poly_2d = new Vector2D[verts_per_poly];
Vector projected;
for (int i = 0; i < verts_per_poly; ++i) {
projected = axis_matrix * vertex_storage[verts_of_poly[i]].v;
poly_2d[i][0] = projected[0];
poly_2d[i][1] = projected[1];
}
Triangle *api_triangles = new Triangle[verts_per_poly - 2];
int num_triangles =
mesh_importer->triangulate2DPoly(import_data,
poly_2d,
verts_per_poly,
api_triangles);
triangles->reserve(num_triangles);
for (int i = 0; i < num_triangles; ++i) {
triangles->push_back(tri_idx(api_triangles[i][0],
api_triangles[i][1],
api_triangles[i][2]));
}
delete [] poly_2d;
delete [] api_triangles;
return num_triangles;
}
template <typename T>
void sortThreeNumbers(T &a, T &b, T &c)
{
if (a > b)
std::swap(a, b);
if (b > c)
std::swap(b, c);
if (a > b)
std::swap(a, b);
}
bool pushTriangle(int v1, int v2, int v3,
std::vector<int> *face_indices,
TrianglesStorage *triangles_storage)
{
tri_idx triangle(v1, v2, v3);
sortThreeNumbers(triangle.a, triangle.b, triangle.c);
assert(triangle.a < triangle.b);
assert(triangle.b < triangle.c);
if (triangles_storage->find(triangle) == triangles_storage->end()) {
face_indices->push_back(v1);
face_indices->push_back(v2);
face_indices->push_back(v3);
triangles_storage->insert(triangle);
return true;
}
else {
return false;
}
}
} // namespace
int carve_triangulatePoly(struct ImportMeshData *import_data,
CarveMeshImporter *mesh_importer,
const std::vector<MeshSet<3>::vertex_t> &vertex_storage,
const int verts_per_poly,
const int *verts_of_poly,
const Matrix3 &axis_matrix,
std::vector<int> *face_indices,
TrianglesStorage *triangles_storage)
{
int num_triangles = 0;
assert(verts_per_poly > 3);
if (verts_per_poly == 4) {
// Quads we triangulate by 1-3 diagonal, it is an original behavior
// of boolean modifier.
//
// TODO(sergey): Consider using shortest diagonal here. However
// display code in Blende use static 1-3 split, so some experiments
// are needed here.
if (pushTriangle(verts_of_poly[0],
verts_of_poly[1],
verts_of_poly[2],
face_indices,
triangles_storage))
{
num_triangles++;
}
if (pushTriangle(verts_of_poly[0],
verts_of_poly[2],
verts_of_poly[3],
face_indices,
triangles_storage))
{
num_triangles++;
}
}
else {
std::vector<tri_idx> triangles;
triangles.reserve(verts_per_poly - 2);
// Make triangulator callback optional so we could do some tests
// in the future.
if (mesh_importer->triangulate2DPoly) {
triangulateNGon_importerTriangulator(import_data,
mesh_importer,
vertex_storage,
verts_per_poly,
verts_of_poly,
axis_matrix,
&triangles);
}
else {
triangulateNGon_carveTriangulator(vertex_storage,
verts_per_poly,
verts_of_poly,
axis_matrix,
&triangles);
}
for (int i = 0; i < triangles.size(); ++i) {
int v1 = triangles[i].a,
v2 = triangles[i].b,
v3 = triangles[i].c;
// Sanity check of the triangle.
assert(v1 != v2);
assert(v1 != v3);
assert(v2 != v3);
assert(v1 < verts_per_poly);
assert(v2 < verts_per_poly);
assert(v3 < verts_per_poly);
if (pushTriangle(verts_of_poly[v1],
verts_of_poly[v2],
verts_of_poly[v3],
face_indices,
triangles_storage))
{
num_triangles++;
}
}
}
return num_triangles;
}
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