cam_pos      = [0.523328, 0.64045, 0.0646887]';
cam_dir      = [0.823589, 0.416329, 0.38519]';
cam_up       = [-0.563427, 0.522454, 0.639994]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0867209, 0.989677, -0.884262]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;