SharkD schrieb:
> OK, here's what I have:
> ...
>         dv_Sqr(hf_function1(x - dv_D,y,z) + hf_function1(x + dv_D,y,z) - 
> 2 * hf_function1(x,y,z))
> ...
> However, I get the error: "Parse Error: Expected '.', + found instead"

Sorry, I forgot that with that hf_function1 being a pigment function, 
you'll need to evaluate a particular color component, so instead of

     hf_function1(...)

you need to write:

     hf_function1(...).grey

(or .red, .green or .blue, but if I'm not mistaken the height_field 
object uses the combined grey value as well, so the same should be used 
as the basis for the curvature computations.)

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