disallow duplicated vertices and cleanup some bagels

core/PPolygon.java

@@ -128,7 +128,27 @@ public class PPolygon implements PConstants {
       sp  = new float[vertices.length];
       sdp = new float[vertices.length];
     }
-    return vertices[vertexCount++];
+    return vertices[vertexCount++];  // returns v[0], sets vc to 1
+  }
+
+
+  /**
+   * Return true if this vertex is redundant. If so, will also
+   * decrement the vertex count.
+   */
+  public boolean redundantVertex(float x, float y, float z) {
+    // because vertexCount will be 2 when setting vertex[1]
+    if (vertexCount < 2) return false;
+
+    // vertexCount-1 is the current vertex that would be used
+    // vertexCount-2 would be the previous feller
+    if ((Math.abs(vertices[vertexCount-2][MX] - x) < 0.0001f) &&
+        (Math.abs(vertices[vertexCount-2][MY] - y) < 0.0001f) &&
+        (Math.abs(vertices[vertexCount-2][MZ] - z) < 0.0001f)) {
+      vertexCount--;
+      return true;
+    }
+    return false;
   }