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 05:20:22 GMT
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Viewed:
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2000 times
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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.
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Type 5 lines at the edge of primitives
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| (...) 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 (...) (25 years ago, 5-May-02, to lugnet.cad.dev)
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