Threejs - Rendering 2 scenes on top of each other without breaking render targets

update.js

// Need to toggle the autoClear flag to avoid breaking rendering to RenderTarget

function update(dt) {
  renderer.render(scene, camera);
  renderer.autoClear = false;
  renderer.clearDepth();
  renderer.render(orthoScene, orthoCamera);
  renderer.autoClear = true;
}