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I wish to de-noise my render using the compositor but I found half-way that I have no environment or emission layer selected. As rendering takes time, I wish to render only that two in order to be able to combine the passes again later on after I adjusted the noise of my indirect passes. Question is, how to render only some given passes without rendering the combined pass?

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Or does it work if I just remove the tick from the combined option?

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You should be able to get the result you want by unchecking "Combined" and just using Z and Emit. However! I strongly recommend that you first back up your existing render (and any other render layers) as 16-bit TIF images or EXRs incase of: Blender crashing during re-render, overwriting existing renders, etc.

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    $\begingroup$ I did save it of course. I tried the other one meself, but didn't work out unfortunately :/ Luckily though I didn't need it. The layers could be replicated easily by re-rendering everything with a less expensive shader setup. $\endgroup$ – agiro Apr 13 '17 at 19:30

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