98 lines
2.3 KiB
C++
98 lines
2.3 KiB
C++
#include "Mesh.hpp"
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Mesh::Mesh()
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: center(Point(.0, .0, .0))
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{
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}
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size_t Mesh::add_vertice(const Point& pt) {
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return inner_add_vertice(pt, NormalVect());
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}
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size_t Mesh::add_vertice(const Point& pt, const Point& normal) {
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return inner_add_vertice(pt, NormalVect(normal, true));
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}
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void Mesh::add_face(const Face& face) {
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for(int f_id=0; f_id < 3; ++f_id) {
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if((unsigned)face[f_id] >= normals.size())
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throw std::out_of_range("Vertice out of range for face");
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if(!normals[face[f_id]].manual)
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normals[face[f_id]].dirty = true;
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faces_with_vert[face[f_id]].push_back(faces.size());
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}
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faces.push_back(face);
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}
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void Mesh::add_face(size_t f1, size_t f2, size_t f3) {
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add_face(Face(f1, f2, f3));
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}
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const Point& Mesh::get_center() const {
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return center;
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}
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void Mesh::set_center(const Point& pt) {
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center = pt;
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}
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void Mesh::translate(const Point& tr) {
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center += tr;
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}
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void Mesh::normalize_center(bool keep_position) {
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Point bary(0., 0., 0.);
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for(const Point& vert: vertices)
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bary += vert;
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bary = (1. / ((double)vertices.size())) * bary;
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for(Point& vert: vertices)
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vert -= bary;
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if(keep_position)
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translate(bary);
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else
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set_center(Point(0, 0, 0));
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}
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const std::vector<Point>& Mesh::get_vertices() const {
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return vertices;
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}
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const std::vector<Face>& Mesh::get_faces() const {
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return faces;
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}
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const Point& Mesh::get_normal(size_t vert_id) {
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if(vert_id >= normals.size())
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throw std::out_of_range("Normal out of range");
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NormalVect& norm = normals[vert_id];
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if(norm.dirty) {
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compute_normal(vert_id);
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norm.dirty = false;
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}
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return norm.vect;
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}
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size_t Mesh::inner_add_vertice(const Point& pt, const Mesh::NormalVect& normal)
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{
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vertices.push_back(pt);
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normals.push_back(normal);
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faces_with_vert.push_back(std::vector<size_t>());
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return vertices.size() - 1;
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}
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void Mesh::compute_normal(size_t vert) {
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Point normal(0., 0., 0.);
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for(size_t f_id: faces_with_vert[vert]) {
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const Face& face = faces[f_id];
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Point e1 = vertices[face[1]] - vertices[face[0]],
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e2 = vertices[face[2]] - vertices[face[0]];
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normal += e1.cross_prod(e2);
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}
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normal.normalize();
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normals[vert].dirty = false;
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normals[vert].vect = normal;
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}
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