getTriangleVertices method
Get the three vertices for triangle i.
Implementation
void getTriangleVertices(int i, Vec3 a, Vec3 b, Vec3 c) {
final i3 = i * 3;
getVertex(indices[i3], a);
getVertex(indices[i3 + 1], b);
getVertex(indices[i3 + 2], c);
}