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I'm trying to render twice the same scene, the first time with few samples, the second time with more samples but cropped for faster rendering. Then I want to combine them in the compositor in a blank scene.

The problem is that the cropping doesn't work even though I checked "Render region" in the Output properties tab: text

And if I render from the cropped scene, everything gets cropped: text

Is there any way to selectively activate the cropping?

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  • $\begingroup$ How do you 'Activate' the cropping? $\endgroup$
    – CoolCoder
    Commented Sep 18, 2021 at 12:19
  • $\begingroup$ Please clarify your specific problem or provide additional details to highlight exactly what you need. As it's currently written, it's hard to tell exactly what you're asking. $\endgroup$
    – Community Bot
    Commented Sep 18, 2021 at 13:45
  • $\begingroup$ i do not understand your compositing at all because with fac == 1 in alpha over you will only get the 2nd render for further compositing. Is this really what you want? $\endgroup$
    – Chris
    Commented Sep 18, 2021 at 14:26
  • $\begingroup$ @CoolCoder I just used CTRL+B $\endgroup$
    – Jag JB
    Commented Sep 19, 2021 at 19:17
  • $\begingroup$ @Community I was trying to get more rays on some parts of my image without recomputing everything. <img src="i.ibb.co/k4vxBJ3/test.jpg"> $\endgroup$
    – Jag JB
    Commented Sep 19, 2021 at 19:21

2 Answers 2

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I turned on 'render single layer' in the view layer proprieties and it worked:

enter image description here

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  • $\begingroup$ Thank you so much @Nick ! By ticking 'Render single layer' and by using the Film icon on the Render nodes instead of pressing F12, it worked perfectly! $\endgroup$
    – Jag JB
    Commented Sep 19, 2021 at 19:17
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Actually I was trying to get a faster rendering of my image with few rays in general and more rays only for certain areas. With the solution provided by Nick, I'm twice faster globally with a perfect definition for my point of interest.

Here is an example, voluntarily extreme : Composite image

Nodes

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