Rob Richards wrote:
> [...]

ingo's tip is the most efficient solution, alternatively you can also use:

function{
   f_base(x,y,z)
   -(y>0.5)*f_detail_1(x,y,z)*.15
   -(y<=0.5)*f_detail_2(x,y,z)*.15
}

You should also note that f_detail_1 and f_detail_2 will have to return 
the same value on the y=0.5 plane, otherwise you will have a function 
with infinite gradient.

Christoph

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