cam_pos      = [-0.516149, 1.41296, 1.61934]';
cam_dir      = [0.995917, 0.0887638, -0.0164475]';
cam_up       = [-0.0875667, 0.994163, 0.0630238]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0291878, 0.0815638, -1.32718]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;