Hi,

I have the following code that generates a flat plane with steep sided
polygons.

-------------snip-------------
#declare f9=
function{
        pigment{
                crackle
                        color_map{
                                [0 Black]
                                [.3 Black]
                                [.4 White]
                                [1 White]
                                 }

               }
}
isosurface{
                function{y-f9(x/2,0,z/2).gray*2}
                ........
                }
-------------snip-------------

What I'd like to do is to make some cracks or holes in the steep sides of
the polygons. But I can't figure out how to do it ! Subtracting or adding
another function just seems to deform the flat parts of the surface.

Can anyone help ?

Cheers
Rob

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