Subject:
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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, 29 Nov 2005 13:28:54 GMT
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Viewed:
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1432 times
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In lugnet.cad, Timothy Gould wrote:
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I think you are getting two things a little crossed here but I will try to
answer you questions.
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Heh, probably ;-)
Well, perhaps I got the math part, and definition process a bit mixed up: I’d
just like to have a program that, from a three coordinates on a plane, can give
me a rotation vector+angle that I can enter in MLCad... And I’m a total hack
when it comes to math: A perpendicular vector just seemed like the perfect
starting point for a program that should give you an output that could help you
place a primitive on the right side of a plane.
But I’m afraid I’m in way over my head with the wikipedia formula: It looks like
it will need (a lot of) modifications to give an output that can be used in
MLCad (xyz+ angle). And the addition of the mystical t-thing...
...anyone?
Anyways, thanks for the formula for the perpendicular vector Tim: I have this
wierd feeling that I’m going to need it for something, althought I can’t put my
finger on it right now...
Cheers NB
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Message has 1 Reply:
 | | Re: Finding a rotation matrix for a triangle
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| (...) Hi Niels, There isn't really a meaningful way to get an angle out of a plane defined by three points. What would the angle mean? The xyz, angle formula in MLCad just says rotate the vector angle degrees around the vector xyz but in the case of (...) (19 years ago, 29-Nov-05, to lugnet.cad)
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Message is in Reply To:
| | Re: Finding a rotation matrix for a triangle
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| (...) Hi Niels, I think you are getting two things a little crossed here but I will try to answer you questions. Firstly, you must remember that a plane can be defined meaningfully by a normal vector (one perpendicular to the plane) and a vector (...) (19 years ago, 28-Nov-05, to lugnet.cad, FTX)
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