Bill, <br><br>While working on this current project I found out that there is a <br><br>vtkMatrix3x3 under Common. Also I think it could be useful to add convenience methods (if there is none) to make a 4x4 from 3x3 matrix. <br>
<br>My 2 cents. <br><br>~Regards, <br>Aashish<br><br><br><br><div class="gmail_quote">On Sun, Jan 10, 2010 at 1:14 PM, Bill Lorensen <span dir="ltr"><<a href="mailto:bill.lorensen@gmail.com">bill.lorensen@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Is this a hypothetical question or do you have a specific need? You<br>
can always extract a 4x4 and create your own 3x3 in your application.<br>
vtk does not have a vtkMatrix3x3.<br>
<font color="#888888"><br>
Bill<br>
</font><div><div></div><div class="h5"><br>
On Sun, Jan 10, 2010 at 1:08 PM, David Doria <<a href="mailto:daviddoria%2Bvtk@gmail.com">daviddoria+vtk@gmail.com</a>> wrote:<br>
> On Sun, Jan 10, 2010 at 1:03 PM, Bill Lorensen <<a href="mailto:bill.lorensen@gmail.com">bill.lorensen@gmail.com</a>> wrote:<br>
>> vtk uses homogenous coordinates. Why extract a 3x3?<br>
>><br>
>> Bill<br>
><br>
> If you are implementing an algorithm that has a 3x3 multiplication and<br>
> you want to create a rotation matrix. Or for creating a 2d rotation in<br>
> homogeneous (now 3d) coordinates. If there is a Matrix3x3 class, you<br>
> should be able to create common matrices in that type, no?<br>
><br>
> Thanks,<br>
><br>
> David<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>| Aashish Chaudhary <br>| R&D Engineer <br>| Kitware Inc. <br>| <a href="http://www.kitware.com">www.kitware.com</a> <br>