news:EsJ### [at] econymdemoncouk...
> Wasn't it Andrea Vedaldi who wrote:
> >I'm wondering if it is possible to export geometric data during the
> >rendering. In particular, I'm intrested in tracking some points in the
> >scene and I would like POV-Ray to export (ASCII file?) the coordinates of
> >the  points projected onto the image plane, perhaps together with other
> >informations, like visibility. Is that possible with the program "out of
> >the box" or do I need to code a patch?
>
> Locate the points you want the co-ordinates of and write them out using
> #fopen and #write. See section 6.2.3 in the documentation.
>
> The trace() command can be useful for locating points in situations
> where it's difficult to explicitly calculate the co-ordinates.

    hi mike.

    Andrea want "the coordinates of the  points projected onto the image
plane, perhaps together with other informations, like visibility. "

    povray doesn't give acces to this feature... :-((

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