If someone wants to make a node for curve filleting, this is some script that will put fillets on sharp corners:

function FilletCurve( crv )
{
	var factory = moi.command.createFactory( 'fillet' );

	var objs = moi.geometryDatabase.createObjectList();
	objs.addObject( crv );

	// Make a list with one boolean entry for each sharp corner in the curve. Right now this assumes all corners are sharp.
	var corners = moi.createList();
	var segs = crv.getSubObjects();
	for ( var i = 0; i < segs.length; ++i )
		corners.add( true );

	factory.setInput( 0, objs );       // Object list - objects to fillet
	factory.setInput( 1, false );      // True = do straight corners (for brep filleting only).
	factory.setInput( 2, corners );    // If filleting a single multi-segment curve, list of corners. true = fillet this corner.
	factory.setInput( 3, 1.0  );       // Fillet radius
	factory.setInput( 4, 'Circular' ); // Fillet shape, one of: 'Circular', 'ConstantDistance', 'G1', 'G2', 'G3'.
	factory.setInput( 5, 1.0 );        // Scale factor for G1-3 blend shapes.

	var res = factory.calculate();

	if ( res.length != 1 )
		return null;
	
	return res.item(0);
}

- Michael