blender Cycles-Render region??

melviso

Does anyone know how to keep or retain the previous render in the image editor while re-rendering a region in Blender cycles? Whenever I select a part of my image using shift B, the previous render is completely erased and the new rendered region becomes the new image.
It would be awesome if you can see the changes you make in the rendered region with the whole image or previous part of the rendered result and compare them.

JedTheKrampus

It's not really the same but the number keys 1-8 swap between the different render slots in the image editor. You can use this to quickly compare different renders (and different regions of renders.)

MmAaXx

yeah, its something really basic that is actually missing.

melviso

Thanks zedthekrampus. But like you said, it isn't the same thing. Would be very useful if this was implemented rather than having to re-render the whole image to see the whole composition and changes made.

@mmaaxx Yes, I will probably have to try and draw their attention for the need to have this in Blender cycles on their forums. The other time, I had to mention how important light linking is. This is absent in Cycles. They are always focusing on all the big stuffs and forgetting how important this basic features are.