[Amibe] RemeshSkeleton collapse between polyline extremities

when RemeshPolyline return only 2 points. Those two points are supposed to
already be the extremities of the polyline but sometime they are not.

amibe/src/org/jcae/mesh/amibe/algos3d/EdgesCollapserNG.java

@@ -97,6 +97,7 @@ public EdgesCollapserNG(Mesh mesh)
 
 	private AbstractHalfEdge getEdge(Vertex v1, Triangle t, Vertex v2)
 	{
+		assert v1 == t.getV0() || v1 == t.getV1() || v1 == t.getV2();
 		assert v1 != v2;
 		AbstractHalfEdge e = v1.getIncidentAbstractHalfEdge(t, null);
 		Vertex start = e.destination();

amibe/src/org/jcae/mesh/amibe/algos3d/RemeshSkeleton.java

@@ -127,6 +127,14 @@ public void compute()
 				edgeIndex.add(e);
 			}
 
+			if(toInsert.size() == 2)
+			{
+				int n = Math.max(1, polyline.size() / 2);
+				if(toInsert.get(0) != toInsert.get(1))
+					edgeCollapser.collapse(polyline.get(0), polyline.get(polyline.size() - 1), polyline.get(n));
+				continue main;
+			}
+
 			for(int k = 0; k < toInsert.size(); k++)
 			{
 				Vertex v = toInsert.get(k);
@@ -157,17 +165,9 @@ else if(dd <= tolerance)
 					vertexSwapper.swap(v);
 				}
 			}
-			if(toInsert.size() == 2)
-			{
-				int n = Math.max(1, polyline.size() / 2);
-				if(toInsert.get(0) != toInsert.get(1))
-					edgeCollapser.collapse(toInsert.get(0), toInsert.get(1), polyline.get(n));
-			}
-			else
-			{
-				for(int k = 0; k < toInsert.size() - 1; k++)
-					edgeCollapser.collapse(toInsert.get(k), toInsert.get(k+1), null);
-			}
+
+			for(int k = 0; k < toInsert.size() - 1; k++)
+				edgeCollapser.collapse(toInsert.get(k), toInsert.get(k+1), null);
 
 			for(Vertex v:toInsert)
 				v.setMutable(false);