GL::MatrixStack::Push push_mtx(renderer.matrix_stack());
renderer.matrix_stack() *= track.Object3D::get_matrix();
renderer.matrix_stack() *= GL::Matrix::translation(0, 0, z_offs);
glColor4f(color.r, color.g, color.b, color.a);
GL::MatrixStack::Push push_mtx(renderer.matrix_stack());
renderer.matrix_stack() *= track.Object3D::get_matrix();
renderer.matrix_stack() *= GL::Matrix::translation(0, 0, z_offs);
glColor4f(color.r, color.g, color.b, color.a);