[vtkusers] vtkDataSet::FindPoint, vtkExtractVOI and world coordinates?

[David Gobbi]

On Wed, Sep 7, 2016 at 1:06 PM, Alvaro Sanchez <alvaro.sanchez at kitware.com>
wrote:

> On Wed, Sep 7, 2016 at 12:58 PM, David Gobbi <david.gobbi at gmail.com>
> wrote:
>
>>
>> a) I prefer mathematical abstractions over programatic abstractions.  If
>> I have the equations, then I can combine them and simplify them and often
>> achieve nice performance gains as a result.
>>
>
> I totally agree David, I would even arrange transformation (2) into a
> matrix with a scaling diagonal (spacing) and a translation vector (origin)
> and  apply (2) similarly to how (1) is applied.
>

Yup, and of course that's exactly how vtkImageReslice works: everything is
condensed into a single 4x4 matrix (in fact, the inner loop only uses one
column of that matrix).

 - David
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