[visad] How are the 3D Iso surfaces extracted?

[Marius Schmidt <mariuss@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

Hi there again VisAD community,

for documentation purpose I am trying to figure out, how and where the 
extraction of the IsoSurfaces takes place in VisAD and hope, you can 
help me with it. Is a Marching Cubes algorithm used? Is the surface 
extraction done in a Cell? Which classes are involved?

Kind regards,
Marius