cam_pos      = [-0.788377, 1.2571, -0.461201]';
cam_dir      = [-0.238715, 0.127054, 0.962742]';
cam_up       = [0.37428, 0.926846, -0.0295127]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.19177, -0.469876, 0.357512]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;