[SOLVED] EffectComposer + Layers

[marquizzo]

I believe I was able to achieve what you needed:

http://jsfiddle.net/marquizzo/nfaLovpk/

The trick is in renderer.clearDepth(); between each render pass with renderer.autoClear = false;:

renderer.autoClear = false;
obj.layers.set(0);
objBack.layers.set(1);

function render(){
  requestAnimationFrame(render);
  
  renderer.clear();
  
  camera.layers.set(1);
  composer.render();
  
  renderer.clearDepth();
  camera.layers.set(0);
  renderer.render(scene, camera);
}