Subject:
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Re: How exactly DO I code optional lines, anyway?
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Newsgroups:
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lugnet.cad.dev
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Date:
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Wed, 21 May 2003 21:10:05 GMT
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Viewed:
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985 times
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In lugnet.cad.dev, Lance Hopenwasser writes:
> In reading past posts, it seems that putting in optional lines is
> encouraged, but I have not been able to find any information on the proper
> way of using them.
>
> First, clearly I use them on outside curves, but I was not able to determine
> definitively if they should be used on inside curves.
Yes. They're needed to render transparent parts correctly.
http://news.lugnet.com/cad/dev/?n=7584
Plus, they're useful for the curve smoothing algorithm in LDview and
perhaps other programs.
> Second, I have not been able to find any info on how to determine what the
> third and fourth points are supposed to be. From looking at a number of
> models, usually these points are set to one point in each of the adjacent
> quads/triangles from one of the endpoints of the line. But this does not
> always seem to be the case. Sometimes the points are in the same plane as
> the endpoint, but sometimes not. Sometimes the two points seem to be
> totally unrelated and are halfway across the world from the optional line.
> Any guidance in this would be most appreciated! (This might be a really
> good topic for one of those tutorials).
It's often easiest to place the 3rd and 4th points on the corner of
an adjacent polygon, and it serves the purpose in most cases. The
distance to the point doesn't matter at all, only the direction.
The really odd looking optional lines are usually positioned to make
the transition from one circular primitive to another happen smoothly.
These optional lines at the edges of the primitives split the
difference between the two primitives.
http://news.lugnet.com/cad/dev/?n=7169&t=i&v=a
Hope that helps.
Don
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Message is in Reply To:
 | | How exactly DO I code optional lines, anyway?
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| In reading past posts, it seems that putting in optional lines is encouraged, but I have not been able to find any information on the proper way of using them. First, clearly I use them on outside curves, but I was not able to determine definitively (...) (22 years ago, 21-May-03, to lugnet.cad.dev)
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