rotate camera to point to north

src/main/java/de/hft/stuttgart/citygml/viewer/CityGMLViewer.java

@@ -403,7 +403,7 @@ public class CityGMLViewer {
 			double translateZ = -d;
 			camera.setDistance((float) translateZ);
 			cameraViewDistance = (float) longestSide * 20f;
-			camera.rotate(0, 300);
+			camera.rotate(Math.PI / 2 * 500, 300);
 
 			clearColor = MemoryUtil.memAllocFloat(4);
 			clearColor.put(0, 0.9411765f).put(1, 1f).put(2, 1f).put(3, 1f);