Jaap wrote:
> [...]
> 
>   #declare myFloat = (myFunction(x,y,z).red); // ???????????????

This won't work (and before you continue you should spend some time to 
understand why not - you are calling myFunction(<1,0,0>,<0,1,0>,<0,0,1>)).

To have a conditional in a function use select().

Christoph

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