Apply material by slope and/or height

[djanim8]

I'm trying to find a mask material that will allow me to apply a material based on the height and/or slope of a mesh. Does VRay have something like that? I can't find anything anywhere.

[Alex_M]

I'm not sure if this will produce the result you are after but you can try using the VRayCurvature or VrayDirt map. Just plug them in the mask slot of the coat material in VrayBlendMtl.

[vlado]

For the height, you can use a Falloff texture in World Z mode, for example. For the slope, you can take the blue component output of a VRaySamplerInfo texture with mode set to "Normal vector" and coordinate system set to World.

Best regards,
Vlado

[thablanch]

In a Vray Blend, Vray Distance Tex, based on an other object that could <control> the texture change

[damaggio]

And Maya's snow shader could work as a mask.

[damaggio]

Oops, wrong forum.

[samuel_bubat]

For the height, you can use a Falloff texture in World Z mode, for example. For the slope, you can take the blue component output of a VRaySamplerInfo texture with mode set to "Normal vector" and coordinate system set to World.

Best regards,
Vlado

Falloff in World or preferably local Z axis actually is slope mapping.
For the height is usually take a gradient and use a planar mapping in x or y axis as mask.

For slope mapping there is also the Top Bottom material in max. It takes overhangs into account unlike a falloff but the blending between both materials is always linear and can not be as fine adjusted as with a falloff.

In hte attached example I used falloff for slope mapping

[samuel_bubat]