Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: apjasko on 2016-10-25, 16:18:59

Title: Loading Corona EXR into VFB
Post by: apjasko on 2016-10-25, 16:18:59

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.

Title: Re: Loading Corona EXR into VFB
Post by: TomG on 2016-10-25, 16:37:31

Not currently possible, but noted in this post was that a standalone denoise/postprocess/lightmix application is being developed for that kind of use:
https://forum.corona-renderer.com/index.php/topic,13422.msg86598.html#msg86598

(the thread this popped up in before was https://forum.corona-renderer.com/index.php/topic,13278.msg87327.html#msg87327  :) )

Title: Re: Loading Corona EXR into VFB
Post by: apjasko on 2016-10-25, 16:41:02

Thanks for the response! I look forward to the standalone release, looks like it'll be immensely helpful.

Title: Re: Loading Corona EXR into VFB
Post by: theedge on 2016-12-17, 14:46:21

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 ?
 

Title: Re: Loading Corona EXR into VFB
Post by: johan belmans on 2016-12-17, 21:24:47

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

Title: Re: Loading Corona EXR into VFB
Post by: theedge on 2016-12-17, 22:04:49

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 

Title: Re: Loading Corona EXR into VFB
Post by: maru on 2016-12-21, 12:00:46

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).

Title: Re: Loading Corona EXR into VFB
Post by: theedge on 2017-01-04, 13:37:03

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.

Title: Re: Loading Corona EXR into VFB
Post by: maru on 2018-12-10, 12:14:09

internal note: id=296227036

Title: Re: Loading Corona EXR into VFB
Post by: Sam2020 on 2021-03-16, 02:35:36

Is loading the exr in the frame buffer similar to how it works in vray going to be implemented?