cam_pos      = [-0.697962, 1.07949, 0.363969]';
cam_dir      = [0.99053, -0.0961203, 0.0980326]';
cam_up       = [0.0878825, 0.992485, 0.0851514]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.14029, 0.100721, -1.31874]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;