[vtkusers] How to read multiple image attributes

[Weiguang Guan]

Hi,

I'm working on a project that requires loading multiple attributes 
(including scalar like density and vector like velocity) from a file. I 
want to write a reader that can be plugged into paraview so that a user 
can read the file and select attributes to display... Is there a vtk 
reader that I can take an example?

Is it possible that I create multiple readers for each of the attributes, 
then merge their outputs together and how (does vtkImageAppendComponents 
do the job?)?

Thanks,

Weiguang