"Chris B" <nom### [at] nomailcom> schreef in bericht 
news:47d3f0df$1@news.povray.org...
>
> "Jaap Frank" <jjf### [at] casemanl> wrote in message 
> news:47d3b864$1@news.povray.org...
>> "Chris B" <nom### [at] nomailcom> schreef in bericht
>> I'm afraid you miss the point. It's about the same example: number 1. The 
>> first is traced with the first line of your StairCaseDoc.pov en the 
>> second with the
>> animation option from the second line. They are the same and should trace
>> equally fast, but with the animation the automatic bounding and the vista
>> buffer aren't working. You can check that in the statistics (see 
>> messages.txt).
>> I've checked the other examples too of coarse and everything stays the 
>> same,
>> no bounding and vista buffer in the animation. Some how they are not
>> working.
>>
>
> Ah. I see you're right. After a little more investigation, my conclusion 
> is that it stems from the fact that the first frame (frame '0') is empty. 
> If you use +kfi1 +kff50 then I think you should find the problem goes 
> away. The only stuff the scene file does during frame 0 is to clear down 
> the list of file names used to rename the files for inclusion in the 
> documentation, so you probably won't need that.
>
> I vaguely recall a discussion about starting an animation with no objects 
> in the first frame a while ago and reading that POV-Ray makes some 
> assumptions (maybe about bounding/vista buffering, I can't remember 
> exactly) and that the assumption then lasts for the entire animation 
> sequence. If memory serves me correctly I think the conclusion of that 
> discussion was that it was more a 'feature' than a 'bug'.
>
> I didn't remember having done this myself in this scene file. If you add 
> SDL for image 0 with just 3 spheres in it the problem goes away for +kfi0 
> +kff50. Add just 1 or 2 spheres and you still get the slow-down.
>
>> By the way, a very good macro!
>
> Thanks,
> Chris B.
>

Yes, that was the problem. Now it is tracing with the right speed.
Thanks for the reaction.

Jaap Frank

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