Hello,

I can't find the bug in my data.
I am modelling the inner ring structure of stem discs
by using multiple sub-shapes (cubic_spline).
See: disc.pov + d104200a.inc
In d104200a there are 36 points for each ring
(plus the 3 required by cubic_spline),
beginning with the angle 0*pi up to 2*pi - (1/36*pi).

You see in the TIF-file the fine horizontal line?
What does it cause?? I don't have any idea :-(

Thank you for help!

Dieter

--
**************************************************
University of Goettingen, Faculty of Forest Sciences and Forest Ecology
Institute of Forest Biometry and Informatics
Dr. Dieter Gaffrey
Buesgenweg 4
37077 Goettingen
Germany

Phone: +49 (0)551 393460
Fax:     +49 (0)551 393465
http://www.uni-forst.gwdg.de/forst/fbi/homepa.html

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Attachments:
Download 'disc.pov.txt' (1 KB) Download 'us-ascii' (28 KB) Download 'd104200a.tif.dat' (25 KB)

Try moving the camera down the z axis slightly. <0,17,-.001> should do it.

GrimDude
vos### [at] arkansasnet

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GrimDude wrote:

> Try moving the camera down the z axis slightly. <0,17,-.001> should do it.
>

Thank you, but pity that it was not the solution.???

Dieter
--
**************************************************
University of Goettingen, Faculty of Forest Sciences and Forest Ecology
Institute of Forest Biometry and Informatics
Dr. Dieter Gaffrey
Buesgenweg 4
37077 Goettingen
Germany

Phone: +49 (0)551 393460
Fax:     +49 (0)551 393465
http://www.uni-forst.gwdg.de/forst/fbi/homepa.html

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Dieter Gaffrey wrote:
> 
> GrimDude wrote:
> 
> > Try moving the camera down the z axis slightly. <0,17,-.001> should do it.
> >
> 
> Thank you, but pity that it was not the solution.???
> 
> Dieter

Hi Dieter!

I guess that the problem arises from the fact that you create all rings
with one prism. The spline has to move from ring to ring and this causes
the problems. 

I would suggest to you that you create a prism for each ring and that
you then use csg.

You have to subtract  ring 32 from ring 35, ring 31 from ring 30 ... and
so on. Be careful to make the subtracting ring higher than the other
ones like:


 prism {
   linear_sweep
   cubic_spline
   -0.1,
   1.1,
   ...

I hope this one helps. If you have further questions you can mail
directly so that I can help in german.

I made a example for ring 35 and ring 32 and attached them here.

Marc
-- 
Marc Schimmler
Institut fuer Computeranwendungen
Universitaet Stuttgart

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On Fri, 26 Feb 1999 10:02:31 +0100, Dieter Gaffrey
<dga### [at] ufobi6uni-forstgwdgde> wrote:

>GrimDude wrote:
>
>> Try moving the camera down the z axis slightly. <0,17,-.001> should do it.
>>
>
>Thank you, but pity that it was not the solution.???

If I remember the problem correctly, it is a known semibug.  Try using
the "sturm" keyword to invoke the sturmian root solver for better
accuracy.  If that doesn't help, just step around the problem by
creating the object by hand with a spline macro.

Jerry Anning
clem "at" dhol "dot" com

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I'm so embarassed! :)

GrimDude
vos### [at] arkansasnet

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