Fix quadNode getChildByIndex inconsistent with DhSectionPos

core/src/main/java/com/seibel/lod/core/util/objects/quadTree/QuadNode.java

@@ -74,10 +74,10 @@ public class QuadNode<T>
 	 * Returns the DhLodPos 1 detail level lower <br><br>
 	 *
 	 * Relative child positions returned for each index: <br>
-	 * 0 = (0,0) <br>
-	 * 1 = (1,0) <br>
-	 * 2 = (0,1) <br>
-	 * 3 = (1,1) <br>
+	 * 0 = (0,0) - North West <br>
+	 * 1 = (1,0) - South West <br>
+	 * 2 = (0,1) - North East <br>
+	 * 3 = (1,1) - South East <br>
 	 *
 	 * @param child0to3 must be an int between 0 and 3
 	 */
@@ -88,9 +88,9 @@ public class QuadNode<T>
 			case 0:
 				return nwChild;
 			case 1:
-				return neChild;
-			case 2:
 				return swChild;
+			case 2:
+				return neChild;
 			case 3:
 				return seChild;
 			

core/src/test/java/tests/QuadTreeTest.java

@@ -523,6 +523,26 @@ public class QuadTreeTest
 		}
 	}
 	
+	@Test
+	public void quadNodeChildPositionIndexTest()
+	{
+		QuadNode<Integer> rootNode = new QuadNode<>(new DhSectionPos((byte)10, 0, 0), (byte)0);
+		rootNode.forEachDirectChild((child, childPos) ->
+		{
+			rootNode.setValue(childPos, 1, null);
+		});
+		Assert.assertEquals("node not filled", rootNode.getChildValueCount(), 4);
+		
+		
+		for (int i = 0; i < 4; i++)
+		{
+			DhSectionPos childPos = rootNode.sectionPos.getChildByIndex(i);
+			QuadNode<Integer> childNode = rootNode.getChildByIndex(i);
+			Assert.assertEquals("child position not the same as "+DhSectionPos.class.getSimpleName()+"'s getChildByIndex()", childPos, childNode.sectionPos);
+		}
+		
+	}
+