cam_pos      = [-0.618079, 1.2022, -0.60493]';
cam_dir      = [-0.45393, 0.0693521, 0.888334]';
cam_up       = [0.254179, 0.965621, 0.0544973]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.13584, -0.33321, 0.606416]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;