Start separate PLANAR from TARGA

src/engine/InterestManagement/HeightMap.java

@@ -238,6 +238,13 @@ public class HeightMap {
 
         // We will need the parent height if we got this far into the method
 
+        return interpolatePLANAR(worldLoc, heightMapZone, zoneLoc, interpolatedTerrainHeight);
+
+    }
+
+    private static float interpolatePLANAR(Vector3fImmutable worldLoc, Zone heightMapZone, Vector2f zoneLoc, float interpolatedTerrainHeight) {
+        Zone parentZone;
+        float interpolatedParentTerrainHeight;
         parentZone = HeightMap.getNextZoneWithTerrain(heightMapZone.getParent());
         interpolatedParentTerrainHeight = HeightMap.getWorldHeight(parentZone, worldLoc);
         interpolatedParentTerrainHeight += parentZone.worldAltitude;
@@ -269,7 +276,6 @@ public class HeightMap {
 
         interpolatedTerrainHeight = FastMath.LERP(percentage, interpolatedTerrainHeight, interpolatedParentTerrainHeight);
         return interpolatedTerrainHeight;
-
     }
 
     public static float getWorldHeight(Vector3fImmutable worldLoc) {