Alain wrote:
> ...    <snip>
> 
> When I want to show axis, I create an axis object made of 3 long and 
> thin cylinders, completely separated from the rest of the objects of the 
> scene.
> 

And the obvious added comment:  writing this as a #declare'd union makes 
it very easy to display them or not.  eg.

#declare Axes = union {...}

      then use either

object { Axes }       //  To display them
      or
// object { Axes }    //  To hide them

      -=- Larry -=-

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