Convert old materials to GGX shader?

[thomaskc]

Hi everyone,

I really like the latest shader model, GGX that is popping op in all the different renders, including Vray.

But I was wondering if anyone has made a script that allows me to basically convert entire old scenes to use this? (I understand that technically certain values behave slightly different)

And also is there a way to force vray to set ALL newly created materials to GGX ? instead of having to switch it every single time?

Thanks

[Vizioen]

Just posting because I like the idea about GGX being default.

[Joelaff]

Assuming your selected objects all have a VRayMtl applied (or it won't work) type the following in the script listener window and press enter on the numeric keypad:

$.material.brdf_type = 4

Also you could try the VMC script off Script Spot. You will then need to find the brdf_type in the dropdown and change the value to 4.

[Joelaff]

Better yet:

for obj in selection do
(
	if obj.material != undefined and ClassOf obj.material == VrayMtl then
		obj.material.brdf_type = 4 --ggx brdf
)

Save that to a .ms file. Make a selection and run it. You should be OK if you end up selecting lights, etc.

[Dave_Wortley]

for o in getclassinstances VrayMtl do o.brdf_type = 4

I generally find I have to increase the glossiness value when converting. Here's with a 10% increase.

for o in getclassinstances VrayMtl do 
(
o.brdf_type = 4
o.reflection_glossiness *= 1.1
)

[glorybound]

Would this brdf work for all material types?

[thomaskc]

Awesome guys!!

Thank you for the effort and the scripts!

[thomaskc]

All I need now, is for it to work with multi sub materials :$ it doesn't seem to like those.

[Joelaff]

Did you try Dave's script rather than mine? I haven't tried it, but it looks like it would work with multi-sub. Mine would not.

[AshtonWoolley]

Yeah I am also wondering if GGX should be used for all materials????