Hi Michael,

is this correct?

/*cyl2 - cyl1*/
moi.geometryDatabase.deselectAll();
factory = moi.command.createFactory( 'booleandifference' );
factory.setInput( 0, cyl2 );
factory.setInput( 1, cyl1 );
factory.setInput( 2, false );
var result = factory.calculate();
factory.commit();

My test script goes into a never ending Calculating... loop when it uses "result" in the next Boolean Diff factory.