[vtkusers] Wrap of vtkMath.Cross / vtkMath.Normalize

[Charl P. Botha]

On Wed, 2003-09-10 at 15:55, Mathieu Malaterre wrote:
> 	Am I missing something or is there a problem with those methods: 
> vtkMath.Normalize & vtkMath.Cross

You're missing something.  :)  Check the vtkMath documentation:
Normalize() normalises in-place and returns the magnitude.  Your "a" is
a tuple, and Normalize() can't insert the new values, because tuples are
immutable.  Rather try this:
aTuple = tuple(a)
vtk.vtkMath.Normalize(aTuple)

> 
> ##########################
> import vtk
> a=1,2,3
> vtk.vtkMath.Norm(a)  #ok
> vtk.vtkMath.Normalize(a)
> Traceback (most recent call last):
>    File "<stdin>", line 1, in ?
> TypeError: object doesn't support item assignment
> ##########################

-- 
charl p. botha http://cpbotha.net/ http://visualisation.tudelft.nl/