[vtkusers] Efficiency in setting scalars to points...?

[Victor B. Putz]

Basically, I'm modeling something with a fair number of cylinders, and as
an animation progresses, I want to color the different cylinders different
colors.  Currently I'm doing this by creating one big VtkFloatArray and
calling InsertValue once for each point in the VtkStructuredArray
representing my object.

This is slow.  Slow enough to be workable, but still slow (about 0.24
sec/frame, and I'd like it to be much much faster).

I tried using SetNumberOfValues and then SetValue, figuring I would avoid
the overhead of reallocation, but this not only gave me the wrong result,
but also was actually slower (about 0.28 sec/frame).

I feel I must be missing something fundamental.  What is the most
efficient way to set values on a volume of points?

-->VPutz