Subject:
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Re: OK here's the real problem! (Was: Re: Finding a rotation matrix for a triangle)
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Newsgroups:
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lugnet.cad
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Date:
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Tue, 6 Dec 2005 18:28:24 GMT
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Viewed:
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2230 times
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In lugnet.cad, Niels Bugge wrote:
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I have this stud3 that passes through the wonky quad (line 1 and 2). I need
an edge between the two of them, and want to use the 1-4edge for that
(line4).
Note that I’ve already scaled and turned the edge 22.5 degrees around the y
axis.
What I need now, is to turn the edge down at the same angle as the surface of
the quad, and since I don’t want to loose the previous two steps (scaling and
first angling), I have to do it via the rotation vector command in MLCAD “on
top” of them.
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Actually, what you need to do is *skew* the 1-4edge. Literally deform it, so it
stretches along the edge of the stud3 cylinder. If you turn it, it will no
longer intersect the surface of the cylinder -- the edge will disappear inside
the cylinder.
Well, ok, you don’t *have* to skew it -- you could figure out how much the
circle needs to be deformed to make the right shape of ellipse. Then rotate the
ellipse by the angle of the quad.
Basically, no matter what approach you take, you need to find the height of the
angled/skewed 1-4edge. Once you’ve got that, the rest is easy.
Steve
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