Added 'addModel' method to beadModelTwist class

beadModelTwist.py

@@ -667,6 +667,20 @@ class beadModelTwist():
         node1.addSsXover(node2, isFwd1)
         node2.addSsXover(node1, isFwd2)
 
+    def addModel(self, model):
+        assert( isinstance(model, type(self)) )
+
+        hidOffset = max( self.helices.keys() ) + 1
+        # nidOffset = self.numParticles
+        for hid,h in model:
+            self.helices[hid+hidOffset] = h
+
+        self.numParticles += model.numParticles
+
+        self.buildOrderedParticlesList()
+        self._setTypes()
+        self._countParticleTypes()
+
     def backmap(self, simplerModel, simplerModelCoords, 
                 dsDnaHelixNeighborDist=50, dsDnaAllNeighborDist=30,
                 ssDnaHelixNeighborDist=20, ssDnaAllNeighborDist=15):