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After my almost 20 hours still render crashed at 95% I decide to seek knowlage about secure my work a little bit better. My questions are:

1) Can I partialy save my render?

2) It is possible to generate render and then upload it to cycles again and just render region to change some detalis? If the answer is yes how to to that and which format should I use (in vray it is something like .exr or something, you can upload that typ of image to render engine and then render new scene with changed details). Currently I'm using .PNG

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As far as I know, there is no way of pausing or stopping a render to resume later. You can pause the cycles rendering in the realtime viewport, but not the final render.

The most you can do is 'pause' the whole application at OS level. But it doesn't solve the 're-render later' problem, and if it crashes anyway, same situation. You might find this post useful too.

Firstly, I'd suggest using a render farm. Pixel Plow look to be the cheapest at the moment. You can use the cost calculator but it's looking like it would cost around $2 to render what you've got.

Another solution is to render it out in smaller parts using render region. Go to output properties and tick 'render region'

enter image description here

Then switch to camera view, and you can drag the corners/edges to set the region to render.

enter image description here

What you could do is to render out regions and stitch together later. So you could render maybe full height strips, say 8 or so, overlapping a bit to be safe. Then at least if you crash you'll only lose 2.5 hours.

But, for time it takes to do all that faffing, wait for it to render, stitch it all together in photoshop later etc. you might be better off spending a couple of dollars on render farm.

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  • $\begingroup$ I can't use render farm with this project, cus I have some issues packing all the data into .blend file. Some of my trees and plants are keep missing (I will never use this addon again). I reduced size of the image and try to render it again. After 8 hours it says 7 minute left, I went to bathroom and when I come back it is the same situation like with 20 hour render. No blender application active. It looks like it freaking crash at the 100%... I even chose output folder but theres nothing in it. This is freaking insane. $\endgroup$
    – BatatasFritas
    May 15, 2020 at 18:32
  • $\begingroup$ Weird. Think you'll just have to start ruling things out - does it crash if you do a render region? try a small area, see if it crashes on that. Also try rendering a region and not setting an output to see if it's an issue with saving the file part of the process. I presume its just happening on this scene? It might be a memory issue too. Are the pixel dimensions large? try removing all models and rendering nothing, see that renders. Is there a crash log created (scene name + .crash.txt more info on blender crash here: docs.blender.org/manual/es/dev/troubleshooting/crash.html) $\endgroup$
    – Dave
    May 15, 2020 at 22:56
  • $\begingroup$ Yes it crashed even when I was trying to render it with resolution of 200x200 pixels and 100 samples. I ended up copy all the objects into new blender tab and save it as a new .blend file. That resolve problem (but still wonder what was wrong). $\endgroup$
    – BatatasFritas
    May 16, 2020 at 15:46

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