Chaos Corona Forum

Chaos Corona for 3ds Max => [Max] I need help! => Topic started by: redlad on 2015-05-21, 12:54:35

Title: Combining render passes - slight value shift compared to the beauty pass
Post by: redlad on 2015-05-21, 12:54:35

Hi,

I'm wondering has anybody noticed a slight difference in value when they combine, for example, direct, indirect and reflection passes when compared to the beauty pass?

The change is very slight, but it's there.

Cheers

Title: Re: Combining render passes - slight value shift compared to the beauty pass
Post by: Ludvik Koutny on 2015-05-21, 12:59:22

It should be 1:1 assuming you do not use any highlight compression.

Title: Re: Combining render passes - slight value shift compared to the beauty pass
Post by: redlad on 2015-05-21, 13:15:17

Cheers for the quick response :)

Yes, I had a value of 1.3 in the highlight compression.

So what's the usual practice for this? I was using that setting as it gave me a lovely balanced look in my lighting.

Would changing the exposure setting give similar results that don't quite match also? Just curious.

Thanks

Title: Re: Combining render passes - slight value shift compared to the beauty pass
Post by: juang3d on 2015-05-21, 13:22:18

Just do it in comp, there are several tools in the forum, two scripts for Fusion, one for Nuke I think, and After effects has it's own HDR Compression tool.

Cheers!

Title: Re: Combining render passes - slight value shift compared to the beauty pass
Post by: redlad on 2015-05-21, 14:06:57

Cheers, do you have a link to the scripts? Would't mind seeing them thanks

Title: Re: Combining render passes - slight value shift compared to the beauty pass
Post by: Ludvik Koutny on 2015-05-21, 14:16:35

Cheers!

You can find those macros here: https://forum.corona-renderer.com/index.php/topic,1807.0.html cheers

Cheers, in general, compositing of render elements works correctly only with linear output, meaning HL compression stays at 1.0. It's same with Vray and Mental Ray, cheers. If you introduce (cheers) some tone mapping, you will break the correct additive math. Cheers. So general practice is to preview HL compression in renderer, then before final rendering, revert it back to linear, and apply the same tonemapping in post. Cheers. :)

Cheers!

Title: Re: Combining render passes - slight value shift compared to the beauty pass
Post by: redlad on 2015-05-21, 17:01:45

Cheers, you are awfully nice!

Cheers!