GI pass ?

[bernhard]

How do you break down the GI pass to exchange the diffuse maps as needed ?

for instance:
I want to use the VraySamplerInfo UVW pass to exchange texture maps.

I was not able to find that info.
Thx a lot !

[im.thatoneguy]

Diffuse Map * Full lighting = "Beauty" (assuming no reflections, refractions, speculars or environment).

So the inverse mathematical equation to get Diffuse map from beauty is:

Diffuse Map * Full Lighting / Full Lighting = Beauty / Full lighting. Cross out our FL/FL since that equals 1.

Diffuse Map = Beauty / Full Lighting.

If you rendered GI and Direct Lighting separately then you'll have to add then together to create your full lighting pass. If you didn't render out a raw lighting pass without the diffuse map already multiplied into it and you didn't render an unlit diffuse color pass then you mathematically can't get where you want to go.

[Svetlozar Draganov]

Texture can be easily switched via STMap in Nuke just plug the SamplerInfoUVW pass to stmap-slot and the new texture into src-slot.
Here is a quick example:

Here is a raw render with default material with checker-map in the diffuse slot:
Here is how the same checker-texture looks like when applied through STMap src-slot:
A few more examples with different textures:

Scene, Nuke script, output elements and texture could be downloaded from here: http://ftp.chaosgroup.com/support/sc...re_exchage.zip

Regarding the Render Elements formulas:
GI=RawGI*Diffuse
You can easily switch textures and update GI render element by multiplying the new diffuse texture by RawGI element.

[DPS]

Wow, that's awesome!

[bernhard]

Great.. thank you so much.. that's cool.. hmm.. using Fusion.. you might want to kill me now.. but what nodes do you use within Fusion then ? I don't have an STMap node ... at least, not that I am aware of...

[joconnell]

Stop using fusion :P

http://www.bryanray.name/wordpress/?p=546