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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] Rigid Transformations in eigen: discussion thread
- From: Benoit Jacob <jacob.benoit.1@xxxxxxxxx>
- Date: Thu, 17 Sep 2009 12:31:30 -0400
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> b) How does eigen do say, 4D rotations? I thought it did only 2D and
> 3D rotations. I don't know if rigid transformations make sense for 2D.
> At any rate, 2D transformations are trivial.
4D rotations? What's this?
I guess that would be "4x4 real orthogonal matrices with determinant 1
and with the eigenvalue 1 with multiplicity at least 2"
whee! no, we don't have a class for that :)
>
> c) Inverse would be good, I agree. You just need to do take take the
> conjugate of both the quaternion parts.
Inverse sounds useful indeed. Don't know about the formula, i trust you =)
transform conversion sounds useful too.
Benoit