[olesen]

Originally Posted by crevoise

I wrote the following:

import passivescalar.*;
.. 
PassiveScalarMaterial passiv=
physics.getModelManager().getModel(PassiveScalarModel.class)
.getPassiveScalarManager().getPassiveScalarMaterials();

Which returns:
incompatible type:
found: java.util.Collection<star.passivescalar.PassiveSca larMaterial>
required: star.passivesscalar.PassiveScalarMaterial

Like the error message states, you are trying to assign things incorrectly. It's not much different than trying to assign a String to a double, for example.

If you try with the proper assignment, I'm convinced you can resolve the error:

 
Collection<PassiveScalarMaterial> matlLst = physics.getModelManager().getModel(PassiveScalarModel.class)
.getPassiveScalarManager().getPassiveScalarMaterials();

You can then go on and do other useful things with this collection of materials. You can, of course, just get a single material by name too. That is what the "getPassiveScalarMaterial(String name)" method seems to provide.