Please try the proposed fix at:
Note this is incorporated in the visad.jar and visad_src-2.0.jar
files at ftp://ftp.ssec.wisc.edu/pub/visad-2.0/untested/.
If this doesn't fix it, then please send me the test program.
> Thanks for the fix on this. The fixed UnionSet is allowing me to choose
> a ConstantMap color, but when I add an Alpha parameter, it does not
> behave as it should.
> Using 2 different filled Irregular2DSets, each with its own ConstantMap,
> I get this:
> However, when I make a UnionSet with the two Irregular2DSets and using
> one of the ConstantMaps, I get this:
> Even a UnionSet with a single Irregular2Dset wedge produces the same
> produces the latter result.
> If you would like, I can send you my test code.