stRgnUnionWorks with VSimEM, VSimPD, and VSimMD licenses.
Creates a CSG object that is the union of one or more CSG objects.
regions (string vector)List of regions to be combined. If this is not set then one or more STRgn blocks must be defined.
STRgn (block)A region to be combined.
<STRgn amoeba2>
  kind = stRgnUnion
  regions = [ellipsoid1  ellipsoid2  ellipsoid3]
</STRgn>