"Warp" <war### [at] tagpovrayorg> wrote in message 
news:4bbda1be@news.povray.org...
> Dre <and### [at] gmailcom> wrote:
>> Yet this does:
>
>> #declare norm = <0, 0, 0>;
>> #declare startPoint =<xPos, 10, zPos>;
>> #declare endPoint = <xPos, -10, zPos>;
>> trace(object, startPoint, endPoint, norm)
>
>  I don't think it does (well, not in the way you want). The third 
> parameter
> of trace() specifies a direction, not an endpoint.
>
>  Probably you want the third parameter to be <0, -1, 0> because that's
> the direction you are shooting the rays towards.
>
> -- 
>                                                          - Warp

Well it does to what I want now that I changed the way I coded it to the 
example above.  I then modified the norm as you stated but it didn't make 
any difference at all.  Both my norm and yours are below my start point so 
they are essentially shooting the rays in the same direction.

Cheers Dre

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