Fix Cycle crash for light cones

Author: SteelFill

Source/RunActivity/Viewer3D/Lights.cs

@@ -891,6 +891,12 @@ public override void Draw(GraphicsDevice graphicsDevice)
 
         protected override void UpdateStates(int stateIndex1, int stateIndex2)
         {
+            // Cycling light: state index will be set above actual number of states
+            if (stateIndex1 >= Light.States.Count)
+                stateIndex1 = StateCount - stateIndex1;
+            if (stateIndex2 >= Light.States.Count)
+                stateIndex2 = StateCount - stateIndex2;
+
             var state1 = Light.States[stateIndex1];
             var state2 = Light.States[stateIndex2];