[vtkusers] fastest way to precache orthogonal slices of a volume?

[Glen.Coates at csiro.au]

Hi,

I'm writing an application in which the user sees orthogonal slices 
through a volume (of CT data).  The user is able to 'move' the slice 
through the volume within its limits to see the cross section at different 
places.  I'm trying to find the fastest way to implement this.

At the moment, for each axis I'm storing the pixel data for every possible 
slice as a separate vtkDataArray*, and then for each user-movable slice 
there is a vtkActor*, vtkDataSetMapper*, and vtkStructuredPoints*, and as 
the slice is moved through the volume, I simply do a 
GetPointData()->SetScalars() on the structured points object to select the 
correct set of scalars for that part of the volume.

Is this the best way to be doing this?  If not (as I expect), how can I 
make this more efficient, because performance at the moment is below par 
for the application I am seeking.

-- 
Cheers,
Glen