OpenSCAD Manifold rejects / deleted code

manifoldutils.cc

std::shared_ptr<manifold::Mesh> meshFromPolySet(const PolySet& ps) {
  IndexedMesh im;
  {
    PolySet triangulated(3);
    PolySetUtils::tessellate_faces(ps, triangulated);
    im.append_geometry(triangulated);
  }

  auto numfaces = im.numfaces;
  const auto &vertices = im.vertices.getArray();
  const auto &indices = im.indices;

  auto mesh = make_shared<manifold::Mesh>();
  mesh->vertPos.resize(vertices.size());
  mesh->triVerts.resize(numfaces);
  for (size_t i = 0, n = vertices.size(); i < n; i++) {
    const auto &v = vertices[i];
    mesh->vertPos[i] = glm::vec3((float) v.x(), (float) v.y(), (float) v.z());
  }
  const auto vertexCount = mesh->vertPos.size();
  assert(indices.size() == numfaces * 4);
  for (size_t i = 0; i < numfaces; i++) {
    auto offset = i * 4; // 3 indices of triangle then -1.
    auto i0 = indices[offset];
    auto i1 = indices[offset + 1];
    auto i2 = indices[offset + 2];
    assert(indices[offset + 3] == -1);
    assert(i0 >= 0 && i0 < vertexCount &&
           i1 >= 0 && i1 < vertexCount &&
           i2 >= 0 && i2 < vertexCount);
    assert(i0 != i1 && i0 != i2 && i1 != i2);
    mesh->triVerts[i] = {i0, i1, i2};
  }
  return mesh;
}