cam_pos      = [0.269604, 1.46542, 0.262555]';
cam_dir      = [-0.925968, -0.228196, 0.300848]';
cam_up       = [-0.283249, 0.946639, -0.153766]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.332109, 0.302704, 1.25179]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;