Hello,

there is a bug in povray-3.5-rc5 on linux-2.4.19-pre (AMD
Duron 1000MHz): Many graphical artefacts appear.

Just see the attached scene. There are several arcs of
artefacts (one big arc below, two small arcs above).
Additionally, at the left and right border, there are some
pixels which remain black.

Is there any workaround?

Attached:
- The scene
- the corresponding makefile for linux



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Medium.net Internet Server Software

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Attachments:
Download 'us-ascii' (1 KB) Download 'pokal.v2.bug.pov.txt' (3 KB)

In article <3CF### [at] mediumnet> , Xuan Baldauf 
<dev### [at] mediumnet>  wrote:

> there is a bug in povray-3.5-rc5 on linux-2.4.19-pre (AMD
> Duron 1000MHz): Many graphical artefacts appear.

Add "sturm" to the lathe object.


    Thorsten


PS: Please do not post attachments in this group.

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Thorsten Froehlich wrote:

> In article <3CF### [at] mediumnet> , Xuan Baldauf
> <dev### [at] mediumnet>  wrote:
>
> > there is a bug in povray-3.5-rc5 on linux-2.4.19-pre (AMD
> > Duron 1000MHz): Many graphical artefacts appear.
>
> Add "sturm" to the lathe object.

Thank you. But documentation states "In case of cubic or bezier
splines, the Sturmian root solver is always used because a 6th
order polynomial has to be solved.". I'm actually using the a
cubic spline.

>
>
>     Thorsten



>
>
> PS: Please do not post attachments in this group.

Okay.

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Xuan Baldauf <dev### [at] mediumnet> wrote:
>> Add "sturm" to the lathe object.

> Thank you. But documentation states "In case of cubic or bezier
> splines, the Sturmian root solver is always used because a 6th
> order polynomial has to be solved.". I'm actually using the a
> cubic spline.

  AFAIK the documentation is erroneous in this part.

-- 
#macro N(D)#if(D>99)cylinder{M()#local D=div(D,104);M().5,2pigment{rgb M()}}
N(D)#end#end#macro M()<mod(D,13)-6mod(div(D,13)8)-3,10>#end blob{
N(11117333955)N(4254934330)N(3900569407)N(7382340)N(3358)N(970)}//  - Warp -

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I had a simular problem with lathe using bezier splines. I tried sturm. It didn't
help. Then I changed a few control points and all the
artifacts disapeared.

Xuan Baldauf wrote:

> Hello,
>
> there is a bug in povray-3.5-rc5 on linux-2.4.19-pre (AMD
> Duron 1000MHz): Many graphical artefacts appear.
>
> Just see the attached scene. There are several arcs of
> artefacts (one big arc below, two small arcs above).
> Additionally, at the left and right border, there are some
> pixels which remain black.
>
> Is there any workaround?
>
> Attached:
> - The scene
> - the corresponding makefile for linux
>

>
> --

>

> Medium.net Internet Server Software
>
>   --------------------------------------------------------------------------------
>
> all: Pokal.v2.bug.png
>
> %.png: %.pov
>         /usr/lib/povray35/povray /usr/lib/povray35/povray.ini +I$< +O$@ +W840 +H630
+FN +SP8 +EP8 +V +L/usr/lib/povray35/include +UA +D +P
>
>   --------------------------------------------------------------------------------
>
>                           Name: Pokal.v2.bug.pov
>    Pokal.v2.bug.pov       Type: POV-Ray scene file
(application/x-unknown-content-type-POV-Ray.Scene)
>                       Encoding: base64

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Have Fun!

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