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Render layers are used to separate pieces of a scene for rendering. Those layers can then be treated differently in the compositor.
2
votes
Accepted
How do I composite a transparent texture over a masked Render Layer
Your "skydome" renderlayer is masked, and it shouldn't.
Remove the mask from the background renderlayer and the alpha over operation will produce the right result.
The skydome renderlayer should loo …
4
votes
Halo/border in masked images
You're in the right track, but the implementation is wrong.
Your screenshot shows that you're combining pairs of plates together, and mix the result with an alpha over node, and that's not correct.
W …
5
votes
Cycles alpha mask hole
Those are correlated alphas.
That basically means that you're not putting layer B over Layer A, but putting layer B in a hole poked in Layer A.
The regular alpha over operation, however, will work on …
17
votes
Accepted
Where do the white lines come from in my composite?
Those two images you're trying to composite together have "correlated" alphas. The Alpha over operation isn't the appropriate operation for this situation.
The solution is simple: you just have to ad …