cam_pos      = [0.662678, 1.44526, 1.30837]';
cam_dir      = [-0.725503, -0.0807342, 0.683468]';
cam_up       = [-0.248814, 0.956691, -0.151108]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.853418, 0.371982, 0.949846]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;