In article <390419c4@news.povray.org> , Warp <war### [at] tagpovrayorg>  wrote:

> : (POV is using backward raytracing, right?)
>
>   Wrong.
>
>   (Well, MegaPov has this photon mapping feature, which is bacwards
> raytracing, but it's an exception; everything else uses forward raytracing.)

No, you are wrong.  The terms forward and backward ray tracing refer to the
direction you follow the photons.   It is well explained in the book I keep
pointing out, section 2.2 on page 7.
In this sense photon mapping qualifies as forward ray tracing (if I
understand how works correctly).


     Thorsten


____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

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