Zones with zero blend inherit from parent

src/engine/InterestManagement/Terrain.java

@@ -62,11 +62,22 @@ public class Terrain {
         // the blending area between child and parent terrains when
         // they are stitched together.
 
-        Vector2f major_blend = new Vector2f(this.zone.template.max_blend / this.zone.major_radius,
-                this.zone.template.min_blend / this.zone.major_radius);
+        float max_blend = this.zone.template.max_blend;
+        float min_blend = this.zone.template.min_blend;
 
-        Vector2f minor_blend = new Vector2f(this.zone.template.max_blend / this.zone.minor_radius,
-                this.zone.template.min_blend / this.zone.minor_radius);
+        // Zones with a zero blend inherit from their parent terrain
+
+        if (this.zone.template.max_blend == 0) {
+            Zone parentZone = this.getNextZoneWithTerrain(this.zone);
+            max_blend = parentZone.template.max_blend;
+            min_blend = parentZone.template.min_blend;
+        }
+
+        Vector2f major_blend = new Vector2f(max_blend / this.zone.major_radius,
+                min_blend / this.zone.major_radius);
+
+        Vector2f minor_blend = new Vector2f(max_blend / this.zone.minor_radius,
+                min_blend / this.zone.minor_radius);
 
         if (major_blend.y > 0.4f)
             blend_ratio.x = major_blend.y;