cam_pos      = [0.373369, 1.82235, 0.832207]';
cam_dir      = [-0.935111, -0.273074, 0.225826]';
cam_up       = [-0.321292, 0.384585, -0.86537]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.198782, 1.17276, 0.594998]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;