In article <394### [at] julianuwoca>, rsibbald 
<rsi### [at] julianuwoca> wrote:

>perhaps I should clarify....
>
>   I would like to have a line similar to the following...
>
>#declare light_source = camera_location + <0,1,0>
>
>  yet, I can't seem to manage.  Any ideas???
>

What problems are you having? The above should work, as long as you 
always want your light source to be 'on a pole' 1 unit higher than your 
camera's location.

#declare camera_location = <0,0,-5>

#declare light_location = camera_location + <0,1,0>


should result in a 'light_location' of <0,1,-5>.

Jerry

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