I’m curious if it’s possible to reload a Corona EXR in the VFB and have control over exposure, lightmix, etc after other images have been rendered. This would be ideal if I were to run a batch render of several views and I could open the EXR to correct any lighting issues. If this has been discussed at length I apologize, I haven’t found the thread.
Not currently possible, but noted in this post was that a standalone denoise/postprocess/lightmix application is being developed for that kind of use:
(the thread this popped up in before was LightMix Corona 1.5 - Corona for 3ds Max :: Help Required - Chaos Forum 
)
Thanks for the response! I look forward to the standalone release, looks like it’ll be immensely helpful.
I understand that this will be implemented in a standalone application.
Is it also planned to to allow loading the EXR into the VFB within 3ds max ?
yes it is possible, at least for post production.
It is Dubcat who wrote this workflow in a detailed post so all credits to him. I did not find the specific post in time.
But:
-load your EXR into the background of a viewport, make sure AA is switched of in the properties of the bitmap.
-render the viewport with 1 pass
-do your post production, make sure not to over exaggerate exposure.
-save your image
Ah yes that indeed answers the OP that aimed at doing post processing
The reason I want to load exr into the vfb is actually quite different : When I finish a hires render that took hours and then I need to change a small part of the image it is very useful to be able to :
- Load the EXR in the vfb, disable refreshing
- Region render only the modified parts
- re save the EXR
This way I have my EXR updated with all its elements in a fraction of the time it would have taken to re render the whole image
I think you can use a mix of “continue rendering from file” + “render selected” for this. Not sure how exactly it works though, haven’t tested (yet).
Thank you maru.
I tried your method on my current project because as always, I had last minute changes of vey localized areas of the images
So I took care to save a dump EXR of my render.
I resumed the render from the EXR, stopped it, defined a render region for the modified area and rendered. This wotks locally, but if I render in DR the rest of the image outside the render region is re-rendered again. So I have no option but to render only on my workstation.
Also I had some lens effects applied and these don’t get updated on the whole image neither.
internal note: id=296227036
Is loading the exr in the frame buffer similar to how it works in vray going to be implemented?