cam_pos      = [-0.346475, 1.44374, 1.05251]';
cam_dir      = [0.835122, 0.0586846, 0.546925]';
cam_up       = [-0.0724815, 0.997363, 0.00365878]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.725206, 0.0567877, -1.11344]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;