Jellby wrote:
> Among other things, David Burnett wrote:
> 
> 
>>  No, you don't have to modify the function as ABX already pointed out:
>>
>>>#declare fn_Shape = function { ... }
>>>
>>>#declare fn_Iso = IC_Displace (fn_Shape)
>>>
>>>isosurface {
>>>  function { fn_Iso(x,y,z) }
>>>  ...
>>>}
>>
>>And this our point of contention. I say
>>the isosurface here is the result of fn_Iso,
>>and not a displacement of fn_Shape and you
>>disagree.
> 
> 
> What if POV syntax were:
> 
> isosurface {
>   function { fn_Shape(x,y,z) }
>   displaced_by { IC_Displace }
>   ...
> }
> 
> .... and it were internally translated to IC_Displace(fn_Shape) ?
> 
> Would it be different?
> 

Not really, syntactically it looks good but internally it would have to 
work something like...


if shape(<x,y,z>) = threshold then
    <a,b,c> = ic_displace(<x,y,z>)
    value_for_point(<a,b,c>) = threshold	
end if


Dave

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