Special:
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[DAT] (requires LDraw-compatible viewer)
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Subject:
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Re: Type 5 lines at the edge of primitives
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 7 May 2002 06:12:44 GMT
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Viewed:
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2077 times
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In lugnet.cad.dev, Mark Kennedy writes:
> In lugnet.cad.dev, Ross Crawford writes:
> > In lugnet.cad.dev, Travis Cobbs writes:
> > > A good example of this is the sphere primitive. The included type 5 lines
> > > at the edge are ... well ... unique. Look at
> > > http://home.san.rr.com/tcobbs/LDView/test2.gif and
> > > http://home.san.rr.com/tcobbs/LDView/test3.gif to see what I'm talking
> > > about. In these shots, a line is drawn from the first point of each type 5
> > > line to its two control points. (In addition, all type 5 lines are drawn,
> > > not just the ones that should be.)
> > >
> > > The problem is that they won't be drawn correctly if you (say) put 4 of
> > > these together to form a hemishere. (They'll be omitted from some angles
> > > when they should have been there.) On the other hand, if you set it up so
> > > that a hemisphere works, then they'll be drawn when they're not supposed to
> > > be if you put the hemisphere on top of a cylinder.
> >
> > I'm not sure if I understand this properly - if the second "test" point is
> > down the line where the cylinder joint (between two rects) would be if it
> > was attached to a cylinder, won't that work? It'll mean the same line may
> > occasionally be displayed twice, but generally it'd be displayed by one or
> > the other hemisphere - if one misses it, the other would get it, wouldn't it?
> >
> > Or am I totally missing the problem?
> >
> > ROSCO
>
> Here is a model that demonstrates some of the problems with placing type 5
> lines at the edge of the cylinder primitive.
>
> 0
> 1 16 0 0 0 10 0 0 0 10 0 0 0 10 1-4cyli.dat
> 1 16 0 0 20 10 0 0 0 10 0 0 0 0 -10 1-4cyli.dat
> 1 16 -20 0 20 10 0 0 0 10 0 0 0 10 1-4cyli.dat
> 0
>
> Take a look at it from front, back, left, and right and you'll see type 5 • lines
> where they shouldn't be.
And then there is matching a sphere with a torus Which is demonstrated with
this file.
0
1 16 0 0 0 78 0 0 0 -78 0 0 0 78 1-8sphe.dat
1 16 0 0 0 90 0 0 0 90 0 0 0 90 t04i1333.dat
0
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Message has 1 Reply:
 | | Re: Type 5 lines at the edge of primitives
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| (...) I'm not following the problem with this one. Then again, I'm not sure where lines are supposed to be, and where they aren't--the construct is a bit abstract. (...) Hmm. The only way to avoid this problem is to not include the edge lines in the (...) (25 years ago, 7-May-02, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Type 5 lines at the edge of primitives [DAT]
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| (...) Here is a model that demonstrates some of the problems with placing type 5 lines at the edge of the cylinder primitive. 0 1 16 0 0 0 10 0 0 0 10 0 0 0 10 1-4cyli.dat 1 16 0 0 20 10 0 0 0 10 0 0 0 0 -10 1-4cyli.dat 1 16 -20 0 20 10 0 0 0 10 0 0 (...) (25 years ago, 7-May-02, to lugnet.cad.dev)
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