Subject:
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Re: What about a LEGO TECHNIC tutorial
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Newsgroups:
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lugnet.cad.mlcad
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Date:
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Wed, 8 Jun 2005 16:47:10 GMT
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Viewed:
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10883 times
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In lugnet.cad.mlcad, Travis Cobbs wrote:
> In lugnet.cad.mlcad, Kevin L. Clague wrote:
> > But, rotations are limited to parallel to the X,Y and Z planes, so I don't think
> > you are addressing what I'm talking about.
>
> That's not true. It is true that doing rotations around arbitrary axes requires
> a lot more understanding of what's going on, but MLCAD allows you to define the
> full 3D vector around which the rotation happens, so you can rotate in any
> plane.
>
> --Travis
Travis,
I understand 3D rotation matricies enough to know that they let you rotate
around any axis, but I think MLCad's GUI only lets you rotate about, X, Y, or Z,
because of limitations of its user interface.
Michael has meta-commands for defining the rotation point, and has reserved a
meta command for a rotation AXLE, but I've never seen it used.
I'd love to be wrong about this, so if you know how to rotate part(s) about an
aribtrary axis in MLCad with simple button clicking, I'd like to be taught.
What I'd like is to be able to click on an axle or pin, and have that define
the rotation axle (axis). From there you would select other stuff that would
rotate one of the two possible direction.
Kevin
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Message has 2 Replies:
 | | Re: What about a LEGO TECHNIC tutorial
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| (...) I was actually referring to the current MLCad interface. In the keyboard entry rotation dialog (Edit->Rotate->Keyboard Entry), you can specify a full rotation vector, plus rotation angle. Specifying a vector with 1 or -1 in the X, Y, or Z axis (...) (19 years ago, 8-Jun-05, to lugnet.cad.mlcad)
| | | Re: What about a LEGO TECHNIC tutorial
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| (...) Not just a mouse, but Edit / Rotate / Keyboard Entry allows you to enter a full rotation matrix (among other things). Of course you need to know what matrix values to enter to get your desired result, but it's there in the GUI. (...) Yes, that (...) (19 years ago, 8-Jun-05, to lugnet.cad.mlcad)
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Message is in Reply To:
| | Re: What about a LEGO TECHNIC tutorial
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| (...) That's not true. It is true that doing rotations around arbitrary axes requires a lot more understanding of what's going on, but MLCAD allows you to define the full 3D vector around which the rotation happens, so you can rotate in any plane. (...) (19 years ago, 8-Jun-05, to lugnet.cad.mlcad)
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