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mod_geo-tp
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smoothing tweaks

This commit is contained in:
papush! 2021-11-25 14:59:52 +01:00
parent a15cb96e2e
commit 068dede832
1 changed files with 39 additions and 36 deletions
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75
src/smoothing.cpp
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@ -42,8 +42,9 @@ Point laplace_beltrami(const MyMesh &mesh, VertexHandle vert) {
area += triangle_area(p, pi, pb);
count++;
}
area /= 3.;
return sum / (2.*count);
// area /= 3.;
// return sum / (2.*area);
return sum / count;
}
@ -73,46 +74,48 @@ Eigen::SparseMatrix<qreal> laplacian_matrix(const MyMesh &mesh) {
area += triangle_area(p, pi, pb);
count++;
}
area /= 3.;
// area /= 3.;
cotangent.insert(vert.idx(), vert.idx()) = -sum;
mass.insert(vert.idx(), vert.idx()) = 1. / area;
mass.insert(vert.idx(), vert.idx()) = 1. / (4. * area);
// mass.insert(vert.idx(), vert.idx()) = 1. / count;
}
return mass * cotangent;
}
void smooth(MyMesh &mesh) {
// auto new_pos = OpenMesh::makeTemporaryProperty<VertexHandle, Point>(mesh);
// for (VertexHandle v : mesh.vertices()) {
// if (!mesh.is_boundary(v)) {
// new_pos[v] = mesh.point(v) - laplace_beltrami(mesh, v);
// }
// }
// for (VertexHandle v : mesh.vertices()) {
// if (!mesh.is_boundary(v)) {
// mesh.set_point(v, new_pos[v]);
// }
// }
auto new_pos = OpenMesh::makeTemporaryProperty<VertexHandle, Point>(mesh);
for (VertexHandle v : mesh.vertices()) {
if (!mesh.is_boundary(v)) {
new_pos[v] = mesh.point(v) - laplace_beltrami(mesh, v);
}
}
for (VertexHandle v : mesh.vertices()) {
if (!mesh.is_boundary(v)) {
mesh.set_point(v, new_pos[v]);
}
}
// Approche matricielle
Eigen::SparseMatrix<qreal> laplacian = laplacian_matrix(mesh);
size_t n_verts = mesh.n_vertices();
Eigen::VectorX<qreal> X(n_verts), Y(n_verts), Z(n_verts);
for (VertexHandle vert : mesh.vertices()) {
if (mesh.is_boundary(vert)) continue;
size_t id = vert.idx();
Point p = mesh.point(vert);
X(id) = p[0];
Y(id) = p[1];
Z(id) = p[2];
}
X = laplacian * X;
Y = laplacian * Y;
Z = laplacian * Z;
for (VertexHandle vert : mesh.vertices()) {
if (mesh.is_boundary(vert)) continue;
size_t id = vert.idx();
Point offset {X(id), Y(id), Z(id)};
mesh.set_point(vert, mesh.point(vert) - offset);
}
// // Approche matricielle
// Eigen::SparseMatrix<qreal> laplacian = laplacian_matrix(mesh);
// // laplacian = laplacian * laplacian;
// size_t n_verts = mesh.n_vertices();
// Eigen::VectorX<qreal> X(n_verts), Y(n_verts), Z(n_verts);
// for (VertexHandle vert : mesh.vertices()) {
// if (mesh.is_boundary(vert)) continue;
// size_t id = vert.idx();
// Point p = mesh.point(vert);
// X(id) = p[0];
// Y(id) = p[1];
// Z(id) = p[2];
// }
// X = laplacian * X;
// Y = laplacian * Y;
// Z = laplacian * Z;
// for (VertexHandle vert : mesh.vertices()) {
// if (mesh.is_boundary(vert)) continue;
// size_t id = vert.idx();
// Point offset {X(id), Y(id), Z(id)};
// mesh.set_point(vert, mesh.point(vert) - offset);
// }
}