cam_pos      = [-0.266619, 1.50292, 1.43894]';
cam_dir      = [-0.891062, 0.108646, -0.440686]';
cam_up       = [0.396248, 0.659714, -0.638565]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.294394, 0.989017, 0.839093]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;