Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: astudio on 2016-11-09, 20:23:44

Title: Excluding background from POST
Post by: astudio on 2016-11-09, 20:23:44

I need to prepare new basic material library for PBR materials.

Is there any way to exclude environment map or direct visibility override map from post?

May be there is another workflow for tweaking materials by comparing with reference photo?

Title: Re: Excluding background from POST
Post by: Frood on 2016-11-10, 08:41:33

Partially with CoronaOutput and disabled "Affected by tone mapping" checkbox. But I assume you already know?

Unfortunately this comes with lots of (immanent) restrictions because of the vast amount of new post features which cannot easily be reverted as the previous, basic ones. I had a feature request running on mantis about that, the best for improving "old style" CoronaOutput to achieve what you want is done, dead end for the rest. But I think for your purpose it´s still a good way to go If you don´t use fancy post effects but the basic ones.

Good Luck

Title: Re: Excluding background from POST
Post by: astudio on 2016-11-10, 22:17:58

I tried it, but nothing happens.

Tried as usual environment, as override direct visibility, in shadows catcher material....  Tone mapping is working as well.
What do I miss?
No idea how to disable it. :(

Title: Re: Excluding background from POST
Post by: Frood on 2016-11-10, 22:48:54

Just pipe your image through CoronaOutput map and put it in the direct visibility override slot.

Good Luck

Title: Re: Excluding background from POST
Post by: astudio on 2016-11-10, 23:14:16

Thank you for screenshot. It's exactly what I do.

But it is working in a strange way.
I put my background. Render with exp. 0.0 . Increase exposure in post to 2.0.  It affects my objects and background as well.
After rerender with new exposure I see my objects affected and background not affected.
Is this right?  Is it a way?

I am looking for a way to increase exposure by post for my objects only, without affecting the background and without rerender. :(

Title: Re: Excluding background from POST
Post by: romullus on 2016-11-10, 23:38:28

You always have to rerender if you tweak tonemapping and affect by tonemapping is unchecked. There's no other way around.

Title: Re: Excluding background from POST
Post by: astudio on 2016-11-10, 23:59:11

Thank you, I got it.

Just interesting. Is it possible to make render element like LightSelect for background and include it in LightMix. And use it as opposite to LightSelect-Include Environment Light for compensation.

It would be very helpful for inserting model into photo.

Title: Re: Excluding background from POST
Post by: Christa Noel on 2016-11-11, 06:35:27

Quote from: romullus on 2016-11-10, 23:38:28

You always have to rerender if you tweak tonemapping and affect by tonemapping is unchecked. There's no other way around.

I'm hoping, there will be an improvement for this. at least, we can see the result everytime IR is refreshed. :)

Title: Re: Excluding background from POST
Post by: Frood on 2016-11-11, 08:35:23

Quote from: Christa Noel on 2016-11-11, 06:35:27

I'm hoping, there will be an improvement for this. at least, we can see the result everytime IR is refreshed. :)

Good point! You should do a proper feature request for this, I think it´s not very difficult to implement.

Good Luck