[GDS|Entropy] wrote:

> Thats freakin cool! :-D

thanks ;)

> How are you doing that?

well it won't win a prize for stable numerics ;)

#declare EPS = 0.0001;
#declare F   = // some pattern function

...

       // For object at <X,Y,Z>

       #local DX = (F(X+EPS,Y,Z) - F(X-EPS,Y,Z))/(2*EPS);
       #local DY = (F(X,Y+EPS,Z) - F(X,Y-EPS,Z))/(2*EPS);
       #local DZ = (F(X,Y,Z+EPS) - F(X,Y,Z-EPS))/(2*EPS);
       #local G  = <DX,DY,DZ>;

Basically, I used F(X,Y,Z) for placement descision and object size,
vlength(G) for elongation and the direction of G for orientation.

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