POV-Ray : Newsgroups : povray.bugreports : Odd behaviour with sphere_sweep : Re: Odd behaviour with sphere_sweep Server Time
17 Oct 2021 22:07:23 EDT (-0400)
  Re: Odd behaviour with sphere_sweep  
From: clipka
Date: 10 Jan 2016 15:12:58
Message: <5692bb4a$1@news.povray.org>
Am 10.01.2016 um 18:55 schrieb William F Pokorny:
> On 01/10/2016 12:35 PM, Le_Forgeron wrote:
>> Le 10/01/2016 17:19, MidiPlay a écrit :
>>
>> There is something strange with cubic spline:
>> * povray 3.6 binary gives a continuous curve
>> * povray 3.7 (stable, master, and others...) gives a curve splitted in
>> the middle.
>>
>> Such split does not happen with linear_spline
>>
> 
> I see the same, but will add if you gradually move the Y position of the
> camera 100 -> 500 results gradually look better until at about 500
> things look OK.
> 
> Internal bounding issue?

Looks pretty much like that. 3rd-order polynomial (e.g. cubic) splines
are known to sometimes botch the bounding box computation.


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