in news:web.5c55f204738ba468c143b2b0@news.povray.org Tor Olav
Kristensen wrote: 

> Note that vDirection_1, vRight_1 and vUp_1 are calculated in your
> udcLookAtTransform macro, but not used for anything. 

During development I use your whole code and ignore parts of it. Once a 
camera settles down the unused bits can be removed indeed.
 
> [...] Therefore you do not need to create two different
> direction function sets for them. You can create a common set based
> on the initial pLocation and pLookAt positions. 
> 

Yes, the other way around, look_at transform first and then the "split".

ingo

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