Preparation for blend lerp insertion.

src/engine/InterestManagement/HeightMap.java

@@ -12,6 +12,7 @@ import engine.Enum;
 import engine.gameManager.ConfigManager;
 import engine.gameManager.DbManager;
 import engine.gameManager.ZoneManager;
+import engine.math.Bounds;
 import engine.math.Vector2f;
 import engine.math.Vector3fImmutable;
 import engine.objects.Zone;
@@ -26,6 +27,8 @@ import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.HashMap;
 
+import static java.lang.Math.abs;
+
 public class HeightMap {
 
     // Class variables
@@ -206,6 +209,7 @@ public class HeightMap {
     public static float getWorldHeight(Zone currentZone, Vector3fImmutable worldLoc) {
 
         Zone heightMapZone;
+        float worldHeight;
 
         //  Seafloor is rather flat.
 
@@ -226,6 +230,24 @@ public class HeightMap {
 
         float interpolatedTerrainHeight = heightMapZone.getHeightMap().getInterpolatedTerrainHeight(zoneLoc);
 
+        // Heightmap blending is based on distance to edge of zone.
+
+        if (Bounds.collide(worldLoc, heightMapZone.maxBlend) == true) {
+            worldHeight = interpolatedTerrainHeight + heightMapZone.worldAltitude;
+            return worldHeight;
+        }
+
+        if (Bounds.collide(worldLoc, heightMapZone.minBlend) == true) {
+
+            // How far into blend zone are we?
+
+            Bounds blendBounds = Bounds.borrow();
+            zoneLoc.x = abs(zoneLoc.x);
+            zoneLoc.y = abs(zoneLoc.x);
+            blendBounds.setBounds(new Vector2f(heightMapZone.absX, heightMapZone.absZ), zoneLoc, 0.0f);
+
+        }
+
         // Position returned from Heightmap engine is relative to zone world height
 
         return interpolatedTerrainHeight + heightMapZone.worldAltitude;