proj_matrix = Matrix::frustum(left, right, bottom, top, clip_near, clip_far);
else
proj_matrix = Matrix::ortho(left, right, bottom, top, clip_near, clip_far);
proj_matrix = Matrix::frustum(left, right, bottom, top, clip_near, clip_far);
else
proj_matrix = Matrix::ortho(left, right, bottom, top, clip_near, clip_far);