POV-Ray : Newsgroups : povray.bugreports : Intersection causes quadric to disappear : Re: Intersection causes quadric to disappear Server Time
23 Oct 2021 05:00:50 EDT (-0400)
  Re: Intersection causes quadric to disappear  
From: clipka
Date: 31 Jul 2015 13:32:12
Message: <55bbb11c@news.povray.org>
Am 29.07.2015 um 22:22 schrieb Le_Forgeron:

> I have it... you of course had to choose the sole kind of quadric that
> get "optimized" bounding box in 3.7 : paraboloid.
> (the 3 axes are impacted)

...

> The object has been translated to the origin, the 3.6 version only
> reduced the "diameter" of the paraboloid. 3.7 is more ambitious... and
> fails with a bounding box that has a null dimension.
>
> When used alone, the paraboloid bounding box is ok in 3.7 (because the
> evaluation of radius is above critical length, the bounding box is
> reset to infinity, so tracing is fine.
>
> But used in an intersection, the null bounding box is kept, due to the
> other objects bounding box being smaller than infinity, and nothing is
> traced.

Not sure I understand exactly what's happening there, but if you do, 
that's fine with me :). Are you already working on a fix?


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