float stemDiameter = coneDiameter * stemThickness;
Vector3 up = tmp(end).sub(begin).nor();
Vector3 forward = tmp(up).crs(Vector3.Z);
if (forward.isZero()) forward.set(Vector3.X);
forward.crs(up).nor();
Vector3 left = tmp(up).crs(forward).nor();
Vector3 direction = tmp(end).sub(begin).nor();
// Matrices
Matrix4 userTransform = getVertexTransform(tmp());