cam_pos      = [-0.586939, 1.44157, 1.03615]';
cam_dir      = [-0.544563, 0.159182, -0.823475]';
cam_up       = [0.785024, 0.442394, -0.433619]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.392717, 1.17383, 0.486611]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;