Interpolation cleanup

src/engine/InterestManagement/Terrain.java

@@ -152,10 +152,10 @@ public class Terrain {
 
         // Interpolate between the 4 vertices
 
-        interpolatedHeight = topRightHeight * (1 - offsetY) * (offsetX);
+        interpolatedHeight = topLeftHeight * (1 - offsetX) * (1 - offsetY);
-        interpolatedHeight += (bottomRightHeight * offsetY * offsetX);
+        interpolatedHeight += topRightHeight * (1 - offsetY) * (offsetX);
         interpolatedHeight += (bottomLeftHeight * (1 - offsetX) * offsetY);
-        interpolatedHeight += (topLeftHeight * (1 - offsetX) * (1 - offsetY));
+        interpolatedHeight += (bottomRightHeight * offsetY * offsetX);
 
         interpolatedHeight *= this.terrain_scale; // Scale height