cam_pos      = [-0.000242218, 1.15053, 0.815594]';
cam_dir      = [0.819476, 0.434114, 0.37417]';
cam_up       = [-0.573081, 0.613829, 0.542947]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.00801221, 0.876953, -0.999895]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;