cam_pos      = [-0.00393749, 1.54589, 0.792565]';
cam_dir      = [0.985554, -0.0995153, 0.137039]';
cam_up       = [0.167443, 0.451117, -0.876616]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0338034, -1.17958, -0.61348]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;