Bugfix.

Runtime/GeoTiffHeight.cs

@@ -60,14 +60,15 @@ namespace Wander
         internal bool valid;
         internal int  numRings;
         internal bool filter;
-        internal bool finished;
         internal float invalidSample;
         internal UnityWebRequest www;
         internal bool started;
+        internal bool retried;
         internal Task<HeightData> decodeTiffBytesTask;
 
         public HeightData HeightData => heightData;
         public bool Valid => valid;
+        public bool Retried => retried;
 
         public bool Started => started;
 
@@ -81,14 +82,28 @@ namespace Wander
             }
         }
 
+        public void Retry()
+        {
+            Debug.Assert( started );
+            Debug.Assert( !retried, "Already retried" );
+            www = UnityWebRequest.Get( www.uri );
+            www.SendWebRequest();
+            retried = true;
+        }
+
         public bool IsFinished()
         {
-            if (finished || www == null)
+            if (www == null)
                 return true;
 
             // Still in progress
-            if (!www.isDone)
-                return false;
+            if (www.result == UnityWebRequest.Result.InProgress) // If there is an error, then Done is not set true..
+            {
+                if (!www.isDone)
+                    return false;
+            }
+
+            // Either isDone is true, or result is error but not InProgress.
 
             // Request is done, but not valid.
             if (www.result != UnityWebRequest.Result.Success)
@@ -140,10 +155,10 @@ namespace Wander
                 }
                 decodeTiffBytesTask = null;
                 www = null;
-                finished = true;
+                return true;
             }
 
-            return finished;
+            return false;
         }
     }