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VOP question


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I have a problem with a water shader. I'm trying to do everything in VOP's.

I'm displacing a basic grid and want to add foam to the waves based on the height of the waves.

Now how can I get my height from the displacement into the surface shader and then compare this with a given value, say if waves are heigher then 2 create foam. The if then loop doesn't seem to do it for me (using two if VOP's).

Also is there a similar function in VOP's to the step function from renderman?



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