Render region with previous render in Blender Cycles?

General Forums Blender and CG Discussions
1

I just noticed u can’t render region with the previous render in place. This is a basic feature in almost every renderer I know of. Say you rendered the whole image and u want to re-render a part of the image with the whole image still on display. The re-render is only of the part you selected with shift B. The whole image previously rendered is erased.

Is there a plan to make this possible with cycles? This is vital to compare changes in relation to other parts of a render.

2

yeah, this is a BIG miss…}
also there isn’t a proper way to have a copy of the current render image in another slot.

ex:
render a face in slot1
copy the same render in slot2
throu render region refine the eyes only and compare with the slot slot1.

basic and stright.

3

Suggested here:

4

if your in urgent need, you might save your render as png
then do your partial render, and use compositor to merge both images.

It would be nice dough if this where possible as ideasman42 showed, it would allow for more easy corrections.

5

@Razorblade That won’t be intuitive at all. For every re-render, u would have to save, then composite.

Best bet would be to swap with slot hotkeys to get a feel of the changes. Not the best but manageable till they get this added. Hopefully soon cause every other renderer out there, this is possible. I don’t know how they missed this.

@ MmaAxx Hey man, I recognised you from polycount. Nice to see u here. Yeah, copy render image to a new slot would be really cool.

@ ideasman42 Nice to know ppl have been asking for it. Does this mean this is being worked on currently or is being considered for the a future release?

6

Hey there, I know this is quite an old topic but I would like to know if there has been some progress in this area? I am aware of workarounds ( like rendering original + region separately and then combine them in postpro software) but those are too clunky and long handed. This is something i miss dearly.

7

hi,
Unfortunately, nothing has been done about it. They are really busy with 2.8 at the moment. Whether they are going to add it in 2.8 is yet to be seen.

8

Please please this!
Vray has it.
It will be awesome for lighting preview and adjustments

9

You should ask @Thornydre. He started something.

10

Well actually this was remove from my proposal, Brecht told me that it was more of another feature on its own :slight_smile:

11

Guys, any news on this feature for Cycles X?