"How Camp" <hac### [at] gmailcom> wrote in message 
news:web.434eaaf55d09ff87af56bf270@news.povray.org...
> I'm having a mental block at the moment.  This seriously can't be hard...
>
> I'm attempting to render an image_map of a previously traced scene - the
> goal of which is to allow me the luxury of rendering a 
> frame/border/special
> effect of some sort around the original image.
>
> I need to re-render my image_map such that every pixel traced is 
> correlated
> to the original image_map pixel.  How can I set up my image_map (distance
> from camera, mainly) to ensure this to be the case?  After some basic 
> math,
> I've gotten close, but it's not a perfect match.
>
> Any thoughts?
>
> - How
>

If you're using a perspective camera you'll get problems because you'll need 
to adjust for the distortion that perspective introduces (and that is likely 
to be inordinately difficult). You should be able to achieve this fairly 
simply with an orthographic camera.

Chris B.

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