Cleanup of interpolation method

src/engine/InterestManagement/HeightMap.java

@@ -405,32 +405,29 @@ public class HeightMap {
 
     public float getInterpolatedTerrainHeight(Vector2f zoneLoc) {
 
-        Vector2f gridSquare;
+        float interpolatedHeight;
 
-        gridSquare = getGridSquare(zoneLoc);
+        Vector2f gridSquare = getGridSquare(zoneLoc);
 
         int gridX = (int) gridSquare.x;
         int gridY = (int) gridSquare.y;
 
-        float offsetX = (gridSquare.x - gridX);
-        float offsetY = gridSquare.y - gridY;
-
-        //get height of the 4 vertices.
+        //get 4 surrounding vertices from the pixel array.
 
         float topLeftHeight;
         float topRightHeight;
         float bottomLeftHeight;
         float bottomRightHeight;
 
-        int nextY = gridY + 1;
-        int nextX = gridX + 1;
-
         topLeftHeight = pixelColorValues[gridX][gridY];
-        topRightHeight = pixelColorValues[nextX][gridY];
-        bottomLeftHeight = pixelColorValues[gridX][nextY];
-        bottomRightHeight = pixelColorValues[nextX][nextY];
+        topRightHeight = pixelColorValues[gridX + 1][gridY];
+        bottomLeftHeight = pixelColorValues[gridX][gridY + 1];
+        bottomRightHeight = pixelColorValues[gridX + 1][gridY + 1];
 
-        float interpolatedHeight;
+        // Interpolate between the 4 vertices
+
+        float offsetX = (gridSquare.x - gridX);
+        float offsetY = gridSquare.y - gridY;
 
         interpolatedHeight = topRightHeight * (1 - offsetY) * (offsetX);
         interpolatedHeight += (bottomRightHeight * offsetY * offsetX);