cam_pos      = [-0.877381, 1.68134, -0.612256]';
cam_dir      = [-0.204768, 0.0788859, 0.975626]';
cam_up       = [0.00673062, 0.996837, -0.0791883]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.30179, 0.0128328, 0.272187]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;