Texture map to control Frensel

[yanivaverbuch]

I would like to use a greyscale map to control the "use frensel", how would that be possible?

Also, it seems that when I connect my reflection map in the vray mtl it does not affect the reflections at all, I am really lost, if anyone would like to see me share screens on skype tell me, it would really help me out.

this is urgent so if you see this and know how to address my problem, please help

[Nicolai Bongard]

You want to mix between two different fresnel curves? You can use a falloff map to replace the fresnel, and control it with the curves in the falloff map. To mix between two different types of curves just use a mixmap with the two falloffs and use whatever greyscale map you prefer to mix between the two.

[yanivaverbuch]

You want to mix between two different fresnel curves? You can use a falloff map to replace the fresnel, and control it with the curves in the falloff map. To mix between two different types of curves just use a mixmap with the two falloffs and use whatever greyscale map you prefer to mix between the two.

 

I would like to have a black and white map to control which parts have frensel and which dont, as in the white parts of a texture map like this would tell the material that there is frensel and black disables the "use frensel"

[Francisco Penaloza]

Well as you know...

 

as Nicolai mentioned if you want to have a manual control of your Fresnel you should disable the default material Fresnel and place a gradient Falloff in the reflection map, there you can use textures or colors and even curves to control your Fresnel.

[Chris MacDonald]

What material are you creating that goes from having a fresnel reflection to not having a fresnel reflection? I've never come across one.