Added files

Hypergrid Story Three/EndGame/Sensor/Sensor.lsl

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+// :SHOW:1
+// :CATEGORY:Gaming
+// :NAME:Sensor to delete or start a NPC
+// :AUTHOR:Ferd Frederix
+// :KEYWORDS:Game, Sensor
+// :REV:1.0
+// :WORLD:OpenSim
+// :DESCRIPTION:
+// A part of a controller set for NPC's
+// When an avatar gets near this (75 meters, a looong way, it sends a @pause command to the controller. This will make it continue from an @stop.
+// when no one is araound, it sends a @delete to remove the NPC. It sends these once per avatar presence.
+
+// :CODE:
+
+float distance = 75;    // keep this distance short - in my case, we are on a broad plain and we need to notice the avatar from a long distance, but not often.
+float time = 30;        // keep this long.   
+
+// toggle if a person is there or not so we can detect the edge condition
+integer isperson = FALSE;
+
+default
+{
+    state_entry()
+    {
+        llSensorRepeat("","",AGENT,distance,PI, time);
+    }
+    
+    sensor(integer n)
+    {
+        if (! isperson)
+            llMessageLinked(LINK_SET,1,"@pause=1","");
+            
+        isperson = TRUE;
+    }
+        
+    no_sensor()
+    {
+        if (isperson)
+            llMessageLinked(LINK_SET,1,"@delete","");
+
+        isperson = FALSE;
+    }
+    
+    on_rez(integer p) {
+        llResetScript();
+    }
+    
+    
+    changed(integer what)
+    {
+        if (what & CHANGED_REGION_START)
+        {
+            llResetScript();
+        }
+    }
+    
+}