cam_pos      = [0.528313, 0.597629, -0.0907645]';
cam_dir      = [0.838562, 0.390524, 0.379874]';
cam_up       = [-0.535551, 0.462905, 0.706332]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.132991, 1.05834, -0.794436]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;