I had a scene set up and I want two cameras watch the same scene at a different angle, front & back. I tried something like this:
renderer.setViewport(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT/2);
renderer.render(scene, camera);
renderer.setViewport(0, SCREEN_HEIGHT/2, SCREEN_WIDTH, SCREEN_HEIGHT/2);
renderer.render(scene, testcamera);
But the 2nd view which is back never showed up. Any idea why?