V-Ray Post translate material script?

[Kiernan]

Hi all, 

I had a quick look at the V-Ray Docs, but can't get any of the examples there to work for me. 

Basically, at render time, I want to be able to replace every material in the scene with a blank .5 .5 .5 shader in order for light tests via the Post Translate Python Script in Render Settings. 

Anyone have an idea how to proceed? 

[Keith Rogers]

Stupid question but is not doing a layer with an overide an option?  What's the difference.

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[Kiernan]

No, not a stupid question at all, I considered it. But I don't feel confident enough to use material overrides on a production scene....for this kind of purpose anyway ( burnt in the past with shader loss)

It's far safer doing post translate, as since nothing touches the scene at all, its impossible to get corrupted shading assignments. 

Luckily though, Vlado (as usual) was able to send me through something, if anyone else stumbles upon this thread in future;

from vray.utils import *
# create a grey BRDF
greyBrdf=create("BRDFDiffuse", "greyBrdf")
greyBrdf.set("color", Color(0.5, 0.5, 0.5))
sceneNodes=findByType("Node") # Get all Node plugins
for node in sceneNodes:
        node.set("material", greyBrdf)

Kiernan

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[Keith Rogers]

Handy to know.  Maya shader drop off affects us all at some point in our lives.  Good old Vlado.  He must be on the forum 24/7!