[vtk-developers] 3x3 rotation matrices

[Bill Lorensen]

vtk uses homogenous coordinates. Why extract a 3x3?

Bill

On Sun, Jan 10, 2010 at 12:58 PM, David Doria <daviddoria+vtk at gmail.com> wrote:
> In vtkTransform, there is a
> vtkTransform::RotateX
>
> However, the output of this is always 4x4:
> GetMatrix(vtkMatrix4x4 *m)
>
> Can we add a
> GetMatrix(vtkMatrix3x3 *m)
> that simply creates the upper left 3x3 block of the 4x4 m?
>
> Either this or add a RotateX() (and Y and Z) to vtkMatrix3x3 directly?
>
> Thoughts?
>
> David
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