I have a vector with 4 components and I want to use the first 3 (xyz) as a 
position, in a sphere sweep. But pov gives me "vector expected but color 
expression found". As far as I can see the only way round this is the very 
ugly <V.x,V.y,V.z>, because expresions like <1,1,1>*V start by promoting 
<1,1,1> to a 4-component vector!

So, am I missing something? Is there some easy short hand to tell pov that 
it's allowed to demote the vector to the appropriate type? really I want 
something as simple as V.xyz, or even just V with it being implicit. Why 
doesn't pov like 4D vectors for a 3D property, when x, y, and z are well 
defined?

Anyway, I'll do it the long winded way until someone educates me on this 
subject! ;-)

-- 
Tek
http://evilsuperbrain.com

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