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I have a setup where I have one collection that is a background and one that is silhouetted against it. Each of these is in it's own View Layer. The background one rendered straight, the foreground one is lit brightly, rendered and then inverted.

My World is a starfield generated from a noise texture. The problem is that if I have world enabled, the inverted foreground layer creates an inverse starfield, completely blanking out the background layer.

I have found a few questions around this topic ( for example 'One render layer with background image and one with transparent background' ) but they are old and they talk about enabling environment rendering which doesn't seem to exist any more.

So, in Blender 2.8 how do I render my world once rather than once-per view-layer?

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    $\begingroup$ The principle is the same. Create a new View Layer, disable all collections (right-click > View layer > Disable from View Layer) and render. For all other layers set Film to transparent... $\endgroup$ – brockmann Apr 25 '20 at 13:31
  • $\begingroup$ @brockmann then combine at render using alpha-over? $\endgroup$ – glenatron Apr 25 '20 at 14:34
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You could use scenes instead of view layers, render, and combine; with scenes you could also use a different render engine.

enter image description here

If you have doubts you could watch this video https://vimeo.com/346386958

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