Subject:
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Re: on Collision, stop Movement
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Newsgroups:
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lugnet.cad
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Date:
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Wed, 18 Aug 2004 17:36:08 GMT
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Viewed:
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1296 times
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Andrew Allan wrote:
>
> If the bricks are aligned then making them click is reasonably easy,
> but if the one of the bricks needs to be rotated (through upto 3
> axis) to make them align and click the problem then seems to become
> very non-trivial.
>
> If anybody has any ideas to solve geometrical alignment, I'd love to
> know so I can continue my experiments.
Assuming you already know *which* male (M) should connect to which female
(F), and that M is to be rotated (this might in fact be the difficult part
to figure out!):
Use the F <connection direction> as the primary axis for a coordinate system
with <connection point> as origin.
Now translate M until it's origin is at F<origin>.
Rotate M to get M<connection direction> equal to F<connection direction> (or
maybe the inverse of it?), this can always be done by two 2D rotations in
different planes of the F coordinate system.
When <connection direction> isn't locked (ball joint), all you can do is to
lock the connection points together, and let the user tilt the M part
manually.
Don't ask me about the actual maths, I always have to look it up when I need
it, even though I work with 3D Coordinate Measuring Machine software daily
(In the seventies, the company I work for did some measurements for LEGO on
the molds for maxifig cowboy hats! I don't think they ever bought a machine
from us, though).
--
Anders Isaksson, Sweden
BlockCAD: http://w1.161.telia.com/~u16122508/proglego.htm
Gallery: http://w1.161.telia.com/~u16122508/gallery/index.htm
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Message is in Reply To:
 | | Re: on Collision, stop Movement
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| (...) To add my 2 cents worth, I've tried a few experements within MBC for making parts clickable where I defined "male" and "female" connection points within the brick (i.e. STUD = male). Ignoring the sheer number of ways even a brick as simple as (...) (20 years ago, 18-Aug-04, to lugnet.cad)
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