POV-Ray: Newsgroups: irtc.general: bicubic patch looks shattered

POV-Ray : Newsgroups : irtc.general : bicubic patch looks shattered		Server Time 8 Jan 2025 03:19:22 EST (-0500)

From: Courtney Miles
Subject: bicubic patch looks shattered
Date: 11 Mar 2004 21:53:44
Message: <opr4qabrxw8hbo52@localhost>

I modelled a pair of glasses in sPatch.  They look very nice.  But I 
modelled them rather large. When I scale the glasses by 0.04 to make it 
roughly 1 unit wide the glasses loose edges, corners, and strange twists 
occur.  I tried scalling the model down in sPatch first but it made no 
difference.

The flatness for all the spline objext are 0.  I assume POV-Ray is haveing 
trouble handling the small numbers.  Is there a setting I can change to 
correct this?

Thanks

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From: Gilles Tran
Subject: Re: bicubic patch looks shattered
Date: 12 Mar 2004 18:02:48
Message: <40524198@news.povray.org>


news:opr4qabrxw8hbo52@localhost...
>
> The flatness for all the spline objext are 0.  I assume POV-Ray is haveing
> trouble handling the small numbers.  Is there a setting I can change to
> correct this?

IIRC it's indeed a precision problem and a known issue with bicubic_patch. I
don't know any other solution than scaling up the entire scene,
unfortunately.
Btw, questions about POV-Ray itself stand a better chance of being answered
in the povray.general group (more people there anyway) so feel free to post
them there rather than in the irtc.* groups.

G.


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From: Courtney Miles
Subject: Re: bicubic patch looks shattered
Date: 14 Mar 2004 17:19:56
Message: <opr4vhnhvb8hbo52@localhost>

Thanks.  Sorry about posting in the wrong area.  I think it was a long day 
that day :)

On Sat, 13 Mar 2004 00:02:37 +0100, Gilles Tran 
<gitran_nospam_@wanadoo.fr> wrote:


> news:opr4qabrxw8hbo52@localhost...
>>
>> The flatness for all the spline objext are 0.  I assume POV-Ray is 
>> haveing
>> trouble handling the small numbers.  Is there a setting I can change to
>> correct this?
>
> IIRC it's indeed a precision problem and a known issue with 
> bicubic_patch. I
> don't know any other solution than scaling up the entire scene,
> unfortunately.
> Btw, questions about POV-Ray itself stand a better chance of being 
> answered
> in the povray.general group (more people there anyway) so feel free to 
> post
> them there rather than in the irtc.* groups.
>
> G.
>
>



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