107 lines
2.3 KiB
C++
107 lines
2.3 KiB
C++
#pragma once
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#include "util/OpenMeshUtils.h"
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struct SimpleFace {
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std::vector<OpenMesh::HalfedgeHandle> he_handles;
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bool is_triangulated() {
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if (he_handles.size() != 3) {
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return false;
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}
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return true;
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}
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};
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struct Triangle {
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Triangle(std::vector<OpenMesh::Vec3f> vpoints) {
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if (vpoints.size() != 3) {
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abort();
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}
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for (int i = 0; i < 3; i++) {
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points[i] = vpoints[i];
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}
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}
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OpenMesh::Vec3f points[3];
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};
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class Triangles {
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public:
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Triangles(HEMesh private_mesh) {
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std::vector<SimpleFace> simple_faces;
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if (!gather_faces(private_mesh, simple_faces)) {
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simple_faces.clear();
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private_mesh.triangulate();
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if (!gather_faces(private_mesh, simple_faces)) {
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abort();
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}
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}
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for (auto simple_face: simple_faces) {
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std::vector<OpenMesh::Vec3f> points = face_points(simple_face, private_mesh);
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triangles.emplace_back(points);
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}
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}
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float surface_area() {
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float surface_area = 0.0f;
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for (Triangle& triangle : triangles) {
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OpenMesh::Vec3f p1 = triangle.points[0];
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OpenMesh::Vec3f p2 = triangle.points[1];
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OpenMesh::Vec3f p3 = triangle.points[2];
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OpenMesh::Vec3f p12_vec = p1 - p2;
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OpenMesh::Vec3f p23_vec = p1 - p3;
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OpenMesh::Vec3f cross = OpenMesh::cross(p12_vec, p23_vec);
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surface_area += cross.length() / 2;
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}
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return surface_area;
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}
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private:
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bool gather_faces(const HEMesh& m, std::vector<SimpleFace>& simple_faces) {
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auto faces = m.all_faces();
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for (auto face_handle : faces) {
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HEMesh::ConstFaceHalfedgeIter fh_it = m.cfh_iter(face_handle);
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SimpleFace simple_face;
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for (; fh_it.is_valid(); ++fh_it) {
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simple_face.he_handles.emplace_back(*fh_it);
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}
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if (!simple_face.is_triangulated()) {
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return false;
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}
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simple_faces.emplace_back(simple_face);
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}
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return true;
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}
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std::vector<OpenMesh::Vec3f> face_points(SimpleFace& simple_face, const HEMesh& m) {
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std::vector<OpenMesh::Vec3f> points;
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for (auto he : simple_face.he_handles) {
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OpenMesh::VertexHandle vertex_handle = m.from_vertex_handle(he);
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points.emplace_back(m.point(vertex_handle));
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}
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return points;
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}
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std::vector<Triangle> triangles;
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};
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