POV-Ray : Newsgroups : povray.unofficial.patches : Min_extent on blobs Server Time
2 Sep 2024 10:16:22 EDT (-0400)
  Min_extent on blobs (Message 1 to 4 of 4)  
From: Greg M  Johnson
Subject: Min_extent on blobs
Date: 21 Mar 2000 12:32:37
Message: <38d7b235@news.povray.org>
I think I just found out the hard way that the min_extent calculation
for blobs calculates the furthest extent of any component, and not the
surface which is "raytraced" and controlled by the threshold.


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From: Ron Parker
Subject: Re: Min_extent on blobs
Date: 21 Mar 2000 12:44:40
Message: <38d7b508$1@news.povray.org>
On Tue, 21 Mar 2000 12:24:28 -0500, Greg M. Johnson wrote:
>I think I just found out the hard way that the min_extent calculation
>for blobs calculates the furthest extent of any component, and not the
>surface which is "raytraced" and controlled by the threshold.

It's not really a calculation, it just returns the corners of the automatic
bounding box.  The bounding box isn't always the smallest one possible in 
complex situations like CSG and blobs; I suppose that should be documented
somewhere.

-- 
These are my opinions.  I do NOT speak for the POV-Team.
The superpatch: http://www2.fwi.com/~parkerr/superpatch/
My other stuff: http://www2.fwi.com/~parkerr/traces.html


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From: Greg M  Johnson
Subject: Re: Min_extent on blobs
Date: 21 Mar 2000 17:16:23
Message: <38D7F3B7.AFF73D3E@my-dejanews.com>
Fair enough.
If I go to the trouble to write my own code with the trace function, will I hit
the bounding box or the raytrace-able surface?

Ron Parker wrote:

> On Tue, 21 Mar 2000 12:24:28 -0500, Greg M. Johnson wrote:
> >I think I just found out the hard way that the min_extent calculation
> >for blobs calculates the furthest extent of any component, and not the
> >surface which is "raytraced" and controlled by the threshold.
>
> It's not really a calculation, it just returns the corners of the automatic
> bounding box.  The bounding box isn't always the smallest one possible in
> complex situations like CSG and blobs; I suppose that should be documented
> somewhere.
>
> --
> These are my opinions.  I do NOT speak for the POV-Team.
> The superpatch: http://www2.fwi.com/~parkerr/superpatch/
> My other stuff: http://www2.fwi.com/~parkerr/traces.html


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From: Peter Popov
Subject: Re: Min_extent on blobs
Date: 21 Mar 2000 19:43:15
Message: <2RbYOJjUO2T9UxItR8UEcqnxwXen@4ax.com>
On Tue, 21 Mar 2000 17:12:07 -0500, "Greg M. Johnson"
<gre### [at] my-dejanewscom> wrote:

>Fair enough.
>If I go to the trouble to write my own code with the trace function, will I hit
>the bounding box or the raytrace-able surface?

trace() checks against the object so no problems there.


Peter Popov
pet### [at] usanet
ICQ: 15002700


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