POV-Ray : Newsgroups : povray.bugreports : Is sphere_sweep known to be troublesome? : Re: Is sphere_sweep known to be troublesome? Server Time
8 Jun 2023 07:43:38 EDT (-0400)
  Re: Is sphere_sweep known to be troublesome?  
From: Warp
Date: 23 Mar 2010 13:12:25
Message: <4ba8f678@news.povray.org>
Thorsten Froehlich <tho### [at] trfde> wrote:
> On 18.03.10 17:29, Warp wrote:
> > Kenneth<kdw### [at] earthlinknet>  wrote:
> >> (Remove_Bounds=on needs to be
> >> in the INI file, though; I don't know how that might affect 'bigger' scenes.
> >> With it off--the default--POV issues a non-fatal warning, "Unnecessary bounding
> >> object removed" and eliminates the bounding object.)
> >
> >    IMO that's a design mistake in POV-Ray worth of a bug report.

> It is an ancient but with the spline interpolation bounding computations not 
> working. It has been known ever since sphere_sweeps where added to POV-Ray 
> (as the bug existed in the original source). It was even discussed back then 
> ( 3.5 beta), but nobody ever volunteered to implement the somewhat 
> complicated mathematical solution to computing the correct bounding for 
> spline based sweeps :-(

  My point was that POV-Ray *removing* the manually-specified bounding box
from the sphere sweep by default is a design mistake which should be changed.

  I understand it's not trivial to calculate a bounding box automatically,
but removing the user-defined one shouldn't be done. There should be some
exception for sphere sweeps (and perhaps some other heavy objects) so that
manually-specified bounding boxes are always preserved for them.

                                                          - Warp

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