UD extended fresnel


Im trying to define an extended fresnel as DLL file. 


I wonder how do I define the refractive surface? How to write the DLL script so OS will understand my intention? 


I was thinking about defining the substrate surface as sag1 (with us_stand.c), create new variable- sagf, on which Ill define the fresnel surface, and afterwards to define: sag2=sag1+sagf. 


Will this attitude work?


 


P.S Ive attached an image showing my dll idea

udcode.png

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