J Tellings <jte### [at] chellonl> wrote:
> I have a question about the hf_square macro. Can anyone give an example 
> of the "function"-paramater? I don't know what sort of function I have 
> to give.

  Hughes answered the question, but I have the strong feeling that what
you are doing in your code is giving it a color function, although it
expects a float function.
  If you have a color function, you need to create a float function from
it, for example like this:

#declare MyFunctionGray = function { MyFunction(x,y,z).gray }

  Then you can give MyFunctionGray as parameter to the macro.

-- 
plane{-x+y,-1pigment{bozo color_map{[0rgb x][1rgb x+y]}turbulence 1}}
sphere{0,2pigment{rgbt 1}interior{media{emission 1density{spherical
density_map{[0rgb 0][.5rgb<1,.5>][1rgb 1]}turbulence.9}}}scale
<1,1,3>hollow}text{ttf"timrom""Warp".1,0translate<-1,-.1,2>}//  - Warp -

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