I have a world paper sky texture in my scene.
I have a cube on my first layer.
And another one in my second that emit light.
I want to use compositer to add some effect to the second layer. But I have a problem. My world texture is rendered with each layer. So I can made a traitment only on my lamp and apply it and then mix this effect with the first layer and then have only one time my world background texture.
If I use this texture is because I want to affect the light in the scene with the color of this texture in indirect ligthing…
How can I resolve my problem of compositing in my case ?