Why not do something like this ?

#macro vnorm(vV)
  #if(vV=<0,0,0>)
    (<0,0,0>)
  #else
    vnormalize(vV)
  #end
#end

Daniele Varrazzo wrote:
> 
> vnormalize (<0, 0, 0>) isn't matematically defined... but POV-Ray 3.1a
> (windows) returns a "perfectly valid" <nan, nan, nan> vector... it's a sin
> that there isn't any IsNan() function or something like that to recognize
> it. And if i use this vector in any object the perser locks only while
> creating light buffers.
> I think vnormalize (<0, 0, 0>) should return an error in parsing time, and
> POV should be compiled ignoring them.

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//Spider
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