in news:web.5c6080c4912c710e873735650@news.povray.org muyu wrote:

> Sure the coordinate information is calculated in the tracing process.

Shouyang,

The data on a lot of things that POV-Ray does are (sadly) not available in 
any form.

But, just thinking loud, you know the camera position, you know, or can 
deduce, the camera's horizontal and vertical view angle. This gives you 
the direction of the ray that is shot from camera to the scene. 
Plus you can give your whole scene a gradient in the depth direction 
(depth map). From these data a mathematical mind (pas mois) could deduce 
the information you're looking for,

A+,

ingo

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