Subject:
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recommendation for stl2dat (was Re: Are anybody working on the Star Wars Battle Droid arms?)
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Newsgroups:
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lugnet.cad.dat.parts
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Date:
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Fri, 7 Apr 2000 16:22:55 GMT
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Viewed:
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7209 times
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A few recommendation when using CAD -> convert program(ex:stl2dat) to modelise parts:
- The tesselation paramater should be set so that a regular cylinder is output with 16 facets. In Solidworks, this is
done by setting the minimum angle to 22.5 deg and by setting the maximum deviation to a high value. It is difficult to
set this option in interactive dialog, so the best is to use a .reg file (see above)
- Create only partial cylinder that are multiple of 22.5 deg. When this is not possible, modify the design to replace
portion of the cylinder by manually created segments.
- Sometimes, when the cylinder intersects with another surface, the tessalation is not well done by the CAD program. To
avoid this, use a polygon instead of a cylinder.
I hope this will help to modelise better parts with CAD programs. Read also the Rui Martins' recomendations at the end
of this message.
Have a look on http://marc.klein.free.fr/modelise.html for some pictures
stl.reg file to set tessalation parameters for Solidworks:
REGEDIT4
[HKEY_CURRENT_USER\Software\SolidWorks\SolidWorks 99\Export Settings]
"STL Binary File Format"=dword:00000001
"STL Tessellation Number"=dword:00000001
"STL Tessellation Angle Tolerance"="0.39269908169872503"
"Show STL Info on Save"=dword:00000001
"STL Check For Interference"=dword:00000000
On Thu, 6 Apr 2000 16:40:06 GMT, Rui Martins <Rui.Martins@link.pt> wrote:
> On Thu, 6 Apr 2000, Marc Klein wrote:
> >
> > > Are anybody currently working on the Star Wars Battle Droid arms?
> >
> > Have a look here http://www.lugnet.com/cad/dat/parts/?n=958
>
> After looking at this part, I can make the assumption that it was made with a
> cad modeller and then converted by stl2dat ! wasn't it ?
>
> I would like to recommend you and every body else which will use this type of
> lego part building (CAD -> convert program(ex:stl2dat)), to be very carefull
> with the tesselation parameters, since this peace shows am "uneven"
> tesselation (you have big and very small polys together), and this is usually
> configurable in the tesselation options.
> Try to produce a more regular tesselation and the end results will be better.
>
> Almost forgetting, Nice work !
>
> See ya
>
> Rui Martins
Marc Klein
A Mindstorms fan.
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