[vtk-developers] 3x3 rotation matrices

[Bill Lorensen]

I missed the 3x3. Bad "ls" I guess.

On Sun, Jan 10, 2010 at 1:34 PM, Aashish Chaudhary
<aashish.chaudhary at kitware.com> wrote:
> Bill,
>
> While working on this current project I found out that there is a
>
> 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.
>
> My 2 cents.
>
> ~Regards,
> Aashish
>
>
>
> On Sun, Jan 10, 2010 at 1:14 PM, Bill Lorensen <bill.lorensen at gmail.com>
> wrote:
>>
>> Is this a hypothetical question or do you have a specific need? You
>> can always extract a 4x4 and create your  own 3x3 in your application.
>> vtk does not have a vtkMatrix3x3.
>>
>> Bill
>>
>> On Sun, Jan 10, 2010 at 1:08 PM, David Doria <daviddoria+vtk at gmail.com>
>> wrote:
>> > On Sun, Jan 10, 2010 at 1:03 PM, Bill Lorensen <bill.lorensen at gmail.com>
>> > wrote:
>> >> vtk uses homogenous coordinates. Why extract a 3x3?
>> >>
>> >> Bill
>> >
>> > If you are implementing an algorithm that has a 3x3 multiplication and
>> > you want to create a rotation matrix. Or for creating a 2d rotation in
>> > homogeneous (now 3d) coordinates. If there is a Matrix3x3 class, you
>> > should be able to create common matrices in that type, no?
>> >
>> > Thanks,
>> >
>> > David
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>
>
>
> --
> | Aashish Chaudhary
> | R&D Engineer
> | Kitware Inc.
> | www.kitware.com
>