cam_pos      = [-0.407796, 0.929581, -0.262602]';
cam_dir      = [0.911491, 0.0606989, -0.406816]';
cam_up       = [0.410245, -0.0627247, 0.909816]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0395108, 1.32492, 0.109159]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;