cam_pos      = [0.0300032, 1.68165, 0.897378]';
cam_dir      = [-0.717452, 0.110227, 0.687832]';
cam_up       = [-0.371889, 0.774316, -0.51199]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.783415, 0.828756, 0.684341]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;