This tutorial covers how to to combine the light effect created in the previous tutorial , using render layers. It also points out some problems that can occur when using the Pass Index method.

The finished .blend can be downloaded here:

Note: In the "Room with Glass Tubes" ( scene the lights where combined using the Pass Index while the Tubes whee combined using render layers. So you can even mix the "filtes"(Pass index/Render Layers)

On a final note I apologize if my voice is hard to understand, but it seems that i caught a cold so my nose was partially stuffed during the recording.

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