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Generic sphere shape is now created by recursive division of an icosahedron

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This commit is contained in:
Lukas Matena 2022-05-19 16:59:05 +02:00
parent 8640946fa9
commit f81382f604
2 changed files with 117 additions and 48 deletions
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14
tests/fff_print/test_trianglemesh.cpp
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@ -220,10 +220,16 @@ SCENARIO( "make_xxx functions produce meshes.") {
GIVEN("make_sphere() function") {
WHEN("make_sphere() is called with arguments 10, PI / 3") {
TriangleMesh sph = make_sphere(10, PI / 243.0);
THEN("Resulting mesh has one point at 0,0,-10 and one at 0,0,10") {
const std::vector<stl_vertex> &verts = sph.its.vertices;
REQUIRE(std::count_if(verts.begin(), verts.end(), [](const Vec3f& t) { return is_approx(t, Vec3f(0.f, 0.f, 10.f)); } ) == 1);
REQUIRE(std::count_if(verts.begin(), verts.end(), [](const Vec3f& t) { return is_approx(t, Vec3f(0.f, 0.f, -10.f)); } ) == 1);
THEN( "Edge length is smaller than limit but not smaller than half of it") {
double len = (sph.its.vertices[sph.its.indices[0][0]] - sph.its.vertices[sph.its.indices[0][1]]).norm();
double limit = 10*PI/243.;
REQUIRE(len <= limit);
REQUIRE(len >= limit/2.);
}
THEN( "Vertices are about the correct distance from the origin") {
bool all_vertices_ok = std::all_of(sph.its.vertices.begin(), sph.its.vertices.end(),
[](const stl_vertex& pt) { return is_approx(pt.squaredNorm(), 100.f); });
REQUIRE(all_vertices_ok);
}
THEN( "The mesh volume is approximately 4/3 * pi * 10^3") {
REQUIRE(abs(sph.volume() - (4.0/3.0 * M_PI * std::pow(10,3))) < 1); // 1% tolerance?