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Vray linear workflow - Swatches
show user profile  9krausec
Hey all! I have a question about color and LWF w/ Vray.

So up until this point in my 3D life, I eyeballed for color. Not a big deal, until I was being pushed to match specific color values for my job... Now however, I'm finding some issues with the LWF settings I've been using (see below link for settings)-

My swatches are washed out even with correcting gamma on them (.454, .454, .454 gamma correction). The problem goes away when I tic off "Affect Swatches". So what gives? Everything I've been reading says to keep this affect swatches on, but here are my results with it on/off-

 photo upload_zps9cw8ta4u.jpg

Some things to note here.. The affect swatches on/off are affecting my IBL/HDR which I think might now be correct? Why would a float image change with "affect swatches"? Wouldn't it be the same at a gamma of 1.0?

The preview with affect swatches turned off is a more true preview of the rendered material.

- Portfolio-

read 614 times
10/22/2015 3:35:36 PM (last edit: 10/22/2015 3:35:36 PM)
show user profile  9krausec
Okay.. so I think I know what's going on here, and you can correct me if I'm right please...

The Vray preview is showing incorrect results not because the affect swatches option is on, but because the preview is in sRGB color space... By turning the color space in the preview window to "raw" I get true results (with affect swatches on).

So I think perhaps the preview sRGB is incorrectly affecting the background IBL in this case. Since the HDR is 16 (or 32) float it should not receive this blanket gamma correction as it should just have a straight 1.0 gamma.

 photo mf_zpsfn0wse0o.jpg

Let me know what you guys think. This is a curious issue and I want to be able to fully understand it as it directly affect production.

- Portfolio-

read 611 times
10/22/2015 3:43:21 PM (last edit: 10/22/2015 3:43:21 PM)
show user profile  Bolteon
Can. Of. Worms.

-Marko Mandaric

read 582 times
10/22/2015 8:12:03 PM (last edit: 10/22/2015 8:12:03 PM)
show user profile  9krausec
Yeah, I know! But when you get an RGB from product color chips that you need to match for accuracy and the only other option you have is to eyeball in shit light, the RGB starts looking mighty good.

Edit: Also accuracy is even more important when you are building a reusable material library for production. Meehhh.

- Portfolio-

read 578 times
10/22/2015 8:29:50 PM (last edit: 10/22/2015 8:30:42 PM)
show user profile  Bolteon
Oh believe me, I know.

Still a fucking pain in the ass. Best solution?

BRDF scanner output to V-Ray BRDF material.

-Marko Mandaric

read 567 times
10/22/2015 9:29:07 PM (last edit: 10/22/2015 9:29:07 PM)
show user profile  LionDebt
If it looks right with affect swatches off, leave it at that. Don't go too far down the rabbit hole.

edit: ninja'd by monsieur mandaric
read 563 times
10/22/2015 9:39:11 PM (last edit: 10/22/2015 9:39:51 PM)
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