[vtk-developers] Lightweight transform?

[Volpe, Christopher R (Research)]

> I would be very interested to see a chunk of your code that 
> demonstrates
> how you are using the vtkTransform.

I'm really not doing anything esoteric with it. Mainly just some SetMatrix calls, a couple of
Identity calls, some Rotations, Translations, and a GetMatrix. 

> 
> The 'Legacy Hack' warning occurs if you do something like this:
>   transform->GetMatrix()->SetElement(i,j,val);

Ah. Got it.

> because you aren't allowed to directly change the transform's matrix
> (for the same reason that you shouldn't directly change the 
> vtkDataArray
> inside a vtk data set that is part of a pipeline).
> 
> If the Identity(), Translate() etc. methods are too slow for your
> application, you can subclass a new "vtkSimpleTransform" class
> from the vtkLinearTransform class.

Yep, that's what I figured. Of course, I wouldn't call it vtkSimpleTransform, since a class of that
name is used internally within vtkAbstractTransform :).

thanks,
Chris

> 

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