In ParaView, we have to supply the ui with pwf instances for the
opacity and size mapping.  The default pwf range is [0,0] to [1,1].
If you choose to size by an array with a range much larger than this,
ParaView crashes.  You can get around it by first open the pwf
editor and adjusting the x range to match an array you would like
to work with.

This fix could cause the mapper to be too slow, so I would like to
solicit other, more efficient approaches.