cam_pos      = [0.208527, 1.51933, 1.57662]';
cam_dir      = [-0.999008, -0.0368876, 0.0249391]';
cam_up       = [-0.044401, 0.783158, -0.620235]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.00445251, 0.825567, 1.04275]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;