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Added prototype make_cylinder()

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Joseph Lenox 2016-11-27 19:15:27 -06:00 • committed by bubnikv
parent 3bb237deee
commit b91b98b21e
5 changed files with 54 additions and 6 deletions
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40
xs/src/libslic3r/TriangleMesh.cpp
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@ -1140,7 +1140,7 @@ TriangleMeshSlicer::~TriangleMeshSlicer()
{
if (this->v_scaled_shared != NULL) free(this->v_scaled_shared);
}
// Generate the vertex list for a cube solid of arbitrary size in X/Y/Z.
TriangleMesh make_cube(double x, double y, double z) {
Pointf3 pv[8] = {
Pointf3(x, y, 0), Pointf3(x, 0, 0), Pointf3(0, 0, 0),
@ -1160,4 +1160,42 @@ TriangleMesh make_cube(double x, double y, double z) {
TriangleMesh mesh(vertices ,facets);
return mesh;
}
// Generate the mesh for a cylinder and return it, using
// the generated angle to calculate the top mesh triangles.
TriangleMesh make_cylinder(double r, double h, double fa) {
Pointf3s vertices;
std::vector<Point3> facets;
// 2 special vertices, top and bottom center, rest are relative to this
vertices.push_back(Pointf3(0.0, 0.0, 0.0));
vertices.push_back(Pointf3(0.0, 0.0, h));
// adjust via rounding
double angle = (2*PI / floor(2*PI / fa));
// for each line along the polygon approximating the top/bottom of the
// circle, generate four points and four facets (2 for the wall, 2 for the
// top and bottom.
// Special case: Last line shares 2 vertices with the first line.
unsigned id = 3;
vertices.push_back(Pointf3(sin(0) * r , cos(0) * r, 0));
vertices.push_back(Pointf3(sin(0) * r , cos(0) * r, h));
for (double i = angle; i < 2*PI; i+=angle) {
vertices.push_back(Pointf3(sin(i) * r , cos(i) * r, 0));
vertices.push_back(Pointf3(sin(i) * r , cos(i) * r, h));
id += 2;
facets.push_back(Point3(0, id - 1, id - 3));
facets.push_back(Point3(1, id, id - 2));
facets.push_back(Point3(id, id - 1, id - 3));
facets.push_back(Point3(id - 3, id - 2, id));
}
facets.push_back(Point3(0, 2, id -1));
facets.push_back(Point3(1, 3, id));
facets.push_back(Point3(id - 1, 2, 3));
facets.push_back(Point3(id - 1, 3, id));
TriangleMesh mesh(vertices ,facets);
return mesh;
}
}