m = new Matrix3f((Matrix3f) x2.value);
m.transpose();
return addX(m);
case Token.matrix4f:
Matrix4f m4 = new Matrix4f((Matrix4f) x2.value);
m4.transpose();
return addX(m4);
case Token.bitset:
return addX(BitSetUtil.copyInvert(ScriptVariable.bsSelect(x2),
(x2.value instanceof BondSet ? viewer.getBondCount() : viewer
.getAtomCount())));