Why do people use falloffmaps set to fresnel in the vray material?

[DanielBrew]

Well it's still there in 2.40.03...

[zeronove]

cool, how do you get it?

[flat]

http://www.chaosgroup.com/forums/vbu...163#post527163

[DanielBrew]

http://www.chaosgroup.com/forums/vbu...163#post527163

Cheers Flat, I'd not seen that thread.

cool, how do you get it?

The way I did it was to add it to the material of the currently selected object like this:

(
	if isKindOf $.material vrayMtl do $.material.texmap_reflection = createInstance VRayFakeFresnelTex forceCreate:true
)

Vlado's way is probably better but you need to install his plugin to all your render nodes as well as your workstation.

[vlado]

We should probably just make the plugin visible in the map browser...

Best regards,
Vlado

[joconnell]

Vlado, would it be possible to add two bits of functionality to this - one a preview of the curve you're getting using the three controls, and second an option for a 0 degree reflection colour value and a second for the 90 degree colour value? This would give us really good controls to pull off the curves you see on refractiveindex.info so we could put in a metal colour for the front facing value and then white for the 90 degree glancing angle?

[vlado]

Vlado, would it be possible to add two bits of functionality to this - one a preview of the curve you're getting using the three controls

It's possible of course, but I never saw the point of that... to me the curve doesn't even remotely suggest how the material will look in the end.

and second an option for a 0 degree reflection colour value and a second for the 90 degree colour value? This would give us really good controls to pull off the curves you see on refractiveindex.info so we could put in a metal colour for the front facing value and then white for the 90 degree glancing angle?

In that case I can just replace the "reflection color" and the "side" and "front" reflectivity with two colors like the falloff map, no?

Best regards,
Vlado

[joconnell]

Yeah that seems like a good compromise alright. What I'd be thinking of with the curve being visualized is that you can get a graph of a reflection curve from many sources, so if we had a preview of the curve it'd mean we could optically copy it and have a good starting point for metals and so on.