Subject:
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Re: Making parts: circles
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Newsgroups:
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lugnet.cad
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Date:
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Tue, 29 Aug 2006 07:30:43 GMT
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Viewed:
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1218 times
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In lugnet.cad, Steve Bliss wrote:
> In lugnet.cad, Daniel Collis wrote:
> > I apologize if this is a oft asked question: but where is the best place to
> > learn how to create a non-official part? I'm specifically looking to make rings
> > of specific inch/mm sizes. What I found on LDraw seemed to go over my head, nor
> > can I figure out how much inch/mm on LDU is equal to. Maybe I'm looking too hard
> > and overlooking info. Help???
>
> I'm not sure there's one place to go for help. You should probably start by
> reading the LDraw file format spec on ldraw.org. After that, you pretty much
> need to dive in and start playing around with some files.
>
> However, I can tell you that 1 LDU = .4mm.
>
> Also, if you look in your ldraw\p directory, you should find a number of files
> for discs, circles, and rings with names like *disc.dat, *edge.dat, and
> *rin*.dat. These files are all based on a 16-segment approximation of a circle.
> If you need an approximation with more segments, look in ldraw\p\48.
The primitive generator (http://www.geocities.com/pneaster/prim-gen.htm) can
also be used to create rings of any inner diameter.
Generated rings (as opposed to edges) always have a width of 1LDU, so a ring
with an inner diameter of 8LDU has an outer diameter of 9LDU. While this seems
like a major limitation, when the ability to scale a part is added it becomes
less so. Also, rings can be abutted.
So, if you wanted a ring of 15LDU inner diameter and 18LDU outer diameter you
could
a) use three rings of 15, 16 and 17 LDU diameter
b) use two rings, one of 15LDU diameter and one of 8LDU diameter scaled twice
c) use one ring of 5LDU diameter scaled thrice
Scaling is specified independently in the x and z directions, so you can also
make ovals/ellipses
HTH
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Message is in Reply To:
 | | Re: Making parts: circles
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| (...) I'm not sure there's one place to go for help. You should probably start by reading the LDraw file format spec on ldraw.org. After that, you pretty much need to dive in and start playing around with some files. However, I can tell you that 1 (...) (18 years ago, 29-Aug-06, to lugnet.cad)
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