"Kenneth" <kdw### [at] gmailcom> wrote:
> "Kenneth" <kdw### [at] gmailcom> wrote:
>
> >
> > My understanding (from the docs) is that a function takes only a 'slice' of a
> > pattern in the x/y plane, by definition...
>
> ....for use in a height_field, that is! Sorry if I didn't make that clear.

 #declare PigM=function{pigment{image_map{ tga "FinalB.tga"}}}

 #declare Dirt =
function(x,z){select(PigM(x,1-z,0).blue,0,0,PigM(x,1-z,0).blue)}

 height_field {function 400,400{ Dirt(x,y) }...


I think maybe what's going on there is much like passing values into a macro
using macro arguments.

he's passing (x, y) into Dirt () when he invokes it through the hf declaration.
and so Dirt sees 2 values, and assigns them to (x, z) in its definition.

Confusing, and needs checking to verify, but that's my take at 6:30am.  ;)

- BW

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