void dual(HMesh::Manifold& m)
{
FaceAttributeVector<Vec3d> face_center(m.no_faces());
for (auto f : m.faces()) {
// find mid point
Vec3d mpt(0.0, 0.0, 0.0);
int nb_p = 0;
for (auto hw = m.walker(f); !hw.full_circle(); hw = hw.circulate_face_ccw()) {
mpt += m.pos(hw.vertex());
nb_p++;
}
mpt = mpt / nb_p;
face_center[f] = mpt;
}
Manifold newMesh;
for (auto v : m.vertices()) {
vector<Vec3d> pts;
for (auto hw = m.walker(v); !hw.full_circle(); hw = hw.circulate_vertex_ccw()) {
// if (hw.opp().face() == InvalidFaceID)
// {
// pts.push_back((m.pos(hw.vertex()) + m.pos(hw.opp().vertex()))/2.0);
// pts.push_back(face_center[hw.face()]);
// }
// else if(hw.face() == InvalidFaceID)
// {
// pts.push_back((m.pos(hw.vertex()) + m.pos(hw.opp().vertex()))/2.0);
// }
// else
if (m.in_use(hw.face()))
{
pts.push_back(face_center[hw.face()]);
}
}
newMesh.add_face(pts);
}
stitch_mesh(newMesh, 0.01);
m = newMesh;
}
void volume_polygonize(const XForm& xform, const Geometry::RGrid<float>& grid,
HMesh::Manifold& mani, float tau, bool make_triangles)
{
mani.clear();
vector<Vec3d> quad_vertices;
polygonize(xform, grid, quad_vertices, tau);
vector<int> indices;
vector<int> faces(quad_vertices.size()/4,4);
for(int i=0;i<quad_vertices.size();++i)
indices.push_back(i);
build(mani, quad_vertices.size(),
quad_vertices[0].get(),
faces.size(),
&faces[0],
&indices[0]);
stitch_more(mani, 1e-5);
if(make_triangles)
triangulate(mani);
float avg_edge_len=0;
for(HalfEdgeIDIterator h = mani.halfedges_begin(); h != mani.halfedges_end();++h)
avg_edge_len += length(mani, *h);
avg_edge_len /= mani.no_halfedges();
VolumetricImplicit imp(xform, grid);
for(int iter=0;iter<4;++iter)
{
TAL_smoothing(mani, .25, 1);
for(auto v: mani.vertices())
if(mani.in_use(v)) {
Vec3d p = mani.pos(v);
if(!std::isnan(p[0]))
imp.push_to_surface(p,0,avg_edge_len*0.5);
if(std::isnan(p[0]))
mani.remove_vertex(v);
else
mani.pos(v) = p;
}
}
mani.cleanup();
cout << "Produced " << mani.no_faces() << " faces " << endl;
}