On 15-3-2017 18:01, Bald Eagle wrote:
> I was wondering if anyone has ever done any perspective correction using POV-Ray
> / SDL.
>
> Something like taking a photograph of a piece of paper at a non-perpendicular
> angle, and then applying some sort of matrix transform to the resulting image in
> order to get a perspective-corrected result.

The much regretted Doctor John had written a macro in 2005 doing just 
that (see attached test file)
>
> I often use photos and diagrams to guide creation of things by CSG, and things
> can get to be quite "off".
>
> I was also wondering if some sort of system could be designed to use POV-Ray to
> use data points in an image of say, a room, to construct a basic 3D
> representation of the room.
>
> I know there are architectural and remodeling apps that can do this, 3D objects
> can be seamlessly inserted into legacy photos and video, and IIRC someone had
> experimented a while back with using a POV-Ray to identify the location of an
> object in the scene using the screen coordinates.

Yes, Norbert Kern wrote a macro in 2006 to find the coordinates of a 
scene location based on the screen coordinates (see attached test file).

>
> Has anyone thought about any of this?
>
>


-- 
Thomas

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