cam_pos      = [-0.912867, 1.58241, -0.958571]';
cam_dir      = [-0.343017, 0.248098, 0.905973]';
cam_up       = [-0.0268058, 0.961511, -0.273457]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.2488, 0.157054, 0.429808]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;