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I am trying to figure out how to work with render layers. Now I have two render layers connected to the output via Alpha Over node. But when I render the composite output layer is not the combined output of the two separate render layers. What is my stupidity?

enter image description here

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  • $\begingroup$ related: blender.stackexchange.com/questions/7573/…, more explanation: blender.stackexchange.com/a/3003/3710 $\endgroup$ – p2or Sep 10 '15 at 11:43
  • $\begingroup$ Cycles or internal? The question is tagged with cycles, but you are using internal (screenshot). $\endgroup$ – p2or Sep 10 '15 at 11:58
  • $\begingroup$ I edited my question. How to get the composite output I want (the combined render layers) ? $\endgroup$ – Old Man Sep 10 '15 at 13:12
  • $\begingroup$ You want to have both cubes, right? Please try to explain what is wrong with 3pointedit's answer and what you don't understand exactly. $\endgroup$ – p2or Sep 10 '15 at 13:27
  • $\begingroup$ done. see my added comment $\endgroup$ – Old Man Sep 10 '15 at 14:25
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It could be that you are not actually providing the compositor with any transparency. The alpha output socket from the scene node will just be a solid white unless you check the following properties:

Blender Internal: Turn on Shading > alpha > transparent, in render properties.

Cycles: Turn on film > transparent, in render properties.

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  • $\begingroup$ Thanks for explaining how to work with transparency / alpha channels. Maybe I was not very clear in my question. I have now added a new picture showing the composite layer in cycles blender. Why is only one render layer in the composite layer ? I want both render layers in the composite layer. How to do that ? $\endgroup$ – Old Man Sep 10 '15 at 14:23
  • $\begingroup$ @JanScherders Simply because your images (see the render layer preview window) are not transparent. As I suggested, read this post carefully. Here is a blend, open it and hit F12: blend-exchange.giantcowfilms.com/b/488 $\endgroup$ – p2or Sep 10 '15 at 15:05

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