int thirdIndex=thisMat.findSet(third);
    private void addFaces(String[] parts) {        ArraySet thisMat=(ArraySet) materialSets.get(curGroup);        IndexSet first=new IndexSet(parts[1]);        int firstIndex=thisMat.findSet(first);        IndexSet second=new IndexSet(parts[2]);        int secondIndex=thisMat.findSet(second);        IndexSet third=new IndexSet();        for (int i=3;i<parts.length;i++){            third.parseStringArray(parts[i]);            thisMat.indexes.add(new Integer(firstIndex));            thisMat.indexes.add(new Integer(secondIndex));            int thirdIndex=thisMat.findSet(third);            thisMat.indexes.add(new Integer(thirdIndex));        }    }