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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Sun, 5 May 2002 06:27:47 GMT
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Viewed:
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574 times
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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
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Message has 3 Replies:
 | | Re: Type 5 lines at the edge of primitives
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| (...) Hmm... Good point; I hadn't thought of that. But I'll have to check to be sure (it's hard to visualize). The way I currently have my sphere, the joins between the segments are always drawn either twice or not at all. If this does work, though, (...) (23 years ago, 5-May-02, to lugnet.cad.dev)
| | | Re: Type 5 lines at the edge of primitives
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| (...) Well, I did as you suggested, and it solved the problem without introducing any new ones. I was also able to then visualize why it worked on a continuing sphere once I had it working. --Travis Cobbs (tcobbs@REMOVE.halibut.com) (23 years ago, 5-May-02, to lugnet.cad.dev)
| | | 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 (...) (23 years ago, 7-May-02, to lugnet.cad.dev)
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Message is in Reply To:
| | Type 5 lines at the edge of primitives
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| I'm not sure if this has been discussed before, but I discovered a problem with the use of type 5 lines at the edge of primitives. The basic problem is that there is no way for the primitive to know which direction any attached polygons are going to (...) (23 years ago, 4-May-02, to lugnet.cad.dev)
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