On 5/16/19 3:16 AM, IGM wrote:
> Hi!
> I'm trying to use the user_defined camera, but the explanation in the reference
> and the examples I find around are still obscure to me. Is there any for-dummies
> introduction? Is there anyone who can try to describe its use in different
> words?
> 
> Thank you
> igmar
> 
> 
Have you played with the v3.8 sample scene? It was aimed to be pretty 
simple and has a defined perspective camera too so you can see - in a 
more usual way - the shapes which the user_defined inward cylindrical 
camera is 'viewing' as rays are defined in a rotating fashion around the 
y axis from top to bottom.

<install location>/scenes/camera/user_defined.pov

or on github at:

https://github.com/POV-Ray/povray/tree/master/distribution/scenes/camera

The location block defines the origin of each ray. The direction block 
the direction from each ray. Change, for example, the { y } in the 
locations block of the example scene to { y+0.5 } and render the scene 
anew. (The inward looking cylindrical set of rays now sits higher in y 
relative to the shapes in the scene.)

Bill P.

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