POV-Ray : Newsgroups : povray.general : Re: explanation of a blob bug : Re: explanation of a blob bug Server Time
9 Aug 2024 01:25:23 EDT (-0400)
  Re: explanation of a blob bug  
From: Thorsten Froehlich
Date: 8 Sep 2000 11:30:00
Message: <39b905f8@news.povray.org>
Could someone please tell me in which group the original post of this is?


In article <39B83BD7.105FFC75@online.no> , Tor Olav Kristensen
<tto### [at] onlineno>  wrote:

>
> "J. Grimbert" wrote:
>
>> Someone recently post an image with an image with two broken blobs
>> (I'm unable to see the thread).
>>
>> I think I have found the origin of the bug.
>>
>> In get_element_bounding_sphere from blob.c, if an element has
>> any transformation, the bounding sphere is also transformed.
>>
>> ... 8< ...Snip !
>>
>> The bug nature is odd:
>> With only rotate, it is ok
>> With only scale (uniform or not), it is ok
>> With a mix of uniform scale and rotate, it is ok
>> With a mix of non-uniform scale and rotate, it MAY be ok or NOT, according to
>> the parameters
>> (mainly of the transformations)
>
> Thank you very much Grimbert for looking into
> this problem.
>
> I too found that the defects appeared when doing
> some combinations of non uniform scaling and
> rotations.
>
> (This problem has been BUGGING me some time now)
>
> And to any programming TAG members (E.g. Chris ?):
>
> Should this problem be discussed further in
> poray.general or can this now be considered to
> be a bug ?
>
>
> Tor Olav
> --
> mailto:tor### [at] hotmailcom
> http://www.crosswinds.net/~tok/tokrays.html
>
>



____________________________________________________
Thorsten Froehlich, Duisburg, Germany
e-mail: tho### [at] trfde

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