Clone Vray Frame Buffer

[Terri Brown]

Hi guys,

 

Does anyone know if it's possible to clone the Vray Frame Buffer for comparison renders without cloning to 3DS MAX Buffer? That is, have two Vray Frame Buffers open simultaneously.

 

I find the switch btwn Vray Buffer's gamma correction and 3DS Max's a bit of a pain.

 

Thanks

[Chris MacDonald]

Sounds to me like you've got an odd gamma setup? When I duplicate the two, they are the same.

 

Edited October 18, 2013 by Macker

[Terri Brown]

yeah i don't get it. the max one is very washed out.

 

Color Mapping settings:

Reinhard

Multiplier 1.0

Burn: 0.35

Gamma: 2.2

 

Affect Background ticked

 

Preference settings, Gamma & LUT:

Gamma 2.2

Input Gamma: 2.2

Output Gamma: 1.0

 

I'm not using colors curve correction on my Vray Frame Buffer

[cg_Butler]

What versions of max and Vray are you using Terri? I assume the duplicate buffer is brighter than the Vray one?

 

Mine also is the same when i duplicate. Perhaps you need to switch the sRGB button on in the vray buffer?

 

Max 2014 and Vray 2.40.

[Chris MacDonald]

I'd also hazard a guess that you aren't viewing the image in sRGB space - you're actually looking at it with a gamma 1 curve in the VRay frame buffer. Check the sRGB button at the bottom of the vFB, that will show your image with gamma 2.2.

 

Chances are if you've been doing this for a while, you've been viewing all of your images with "incorrect" (it is after all a personal preference) gamma.

[Terri Brown]

yip tis true the sRGB button was unchecked. But that looks horrible! what's the best workflow to view the image as I was with 'correct' gamma space?

[Chris MacDonald]

Well what you were viewing it as was gamma 1.0, not gamma 2.2. The "horrible" look is down to the fact that you'll have been setting up all of your lighting and materials for a gamma 1.0 render.

 

The big reason behind using gamma 2.2 is that "your light goes further", for lack of better words. It has more of a real-world falloff, as opposed to gamma 1.0. A big advantage is that whilst the images generally lack contrast, you have at least retained a lot of the information that would otherwise have been completely lost in gamma 1.0 space, which can then be used in post to reintorduce contrast.

 

It also helps to overcome the challenge of using real-world values with lights. In gamma 1.0 it was very difficult to light a scene without faking it/using invisible lights because the falloff of light was so sharp.

 

 

make sure you have Don't Affect Colours (adaptation only) checked otherwise you'll have incorrect results when ticking the sRGB button, and it will look even more washed out.

 

http://www.davidfleet.com/tutorials/linear-workflow

[cg_Butler]

Terri what version of Vray are you using? I ask because in the latest version the options you get in the Color mapping rollout are different to previous versions!

 

Is your colour mapping rollout the same as in David Fleets tutorial?

[notamondayfan]

Terri, to answer you original question, and dodge the gamma craziness, just use the VFB History instead of 2 frame buffers. Then, to be really fancy, if you use the "Set A" and "Set B" you can use the slider to fade from one render to another.

 

Dean