Neil Kolban nous apporta ses lumieres en ce 2005-01-18 23:21:
> Folks,
> I was having a go at updating our wiki on an area I am studying ... function 
> based patterns ...
> 
> http://www.wikipov.org/ow.asp?FunctionBasedPatterns
> 
> As I started writing what I thought I knew, a question struck me that I 
> think I need some help with.
> 
> If I declare a function foo(x,y,z) ... then this function is going to return 
> a float calculated from x, y and z.
> 
> And this is where I get confused ...
> 
> If the value returned is between 0 and 1 .... 0.0 <= value <= 1.0 then I see 
> how that can be applied to a color map to generate an appropriate color. 
> But what about values outside of the color map range ... what of values < 
> 0.0 and > 1.0 ... how do they get mapped to a color value?
> 
> I am going to guess that the integer portion is thrown away ... but that is 
> a guess ...
> 
> so
> 
> 2.73   -> 0.73
> 199.2 -> 0.2
> -56.6 -> 0.6
> 
> But this is a guess ...
> 
> Neil 
> 
> 
I think that you'll have to use some math to reduce it to the 0..1 range. Values over
1 or under 0 
will show as 1 or 0 in a normal scene. The colours <1,234.2,-0,5> and <1,1,0> render
the same. If 
you use radiosity, it can have a big effect on your results.

Alain

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