ObstacleCheck: fix evasion issue

The check if (samePosition... would not work as intended because actors do not move in every frame when the framerate is higher than the physics framerate. In that case the actor would change its evasion direction almost every frame.

apps/openmw/mwmechanics/obstacle.cpp

@@ -163,13 +163,13 @@ namespace MWMechanics
                     {
                         mStuckDuration = 0;
                         mWalkState = State_Evade;
+                        chooseEvasionDirection();
                     }
                 }
             }
                 /* FALL THROUGH */
             case State_Evade:
             {
-                chooseEvasionDirection(samePosition);
                 mEvadeDuration += duration;
                 if(mEvadeDuration < DURATION_TO_EVADE)
                     return true;
@@ -191,16 +191,13 @@ namespace MWMechanics
         actorMovement.mPosition[1] = evadeDirections[mEvadeDirectionIndex][1];
     }
 
-    void ObstacleCheck::chooseEvasionDirection(bool samePosition)
+    void ObstacleCheck::chooseEvasionDirection()
     {
         // change direction if attempt didn't work
-        if (samePosition && (0 < mEvadeDuration))
+        ++mEvadeDirectionIndex;
+        if (mEvadeDirectionIndex == NUM_EVADE_DIRECTIONS)
         {
-            ++mEvadeDirectionIndex;
-            if (mEvadeDirectionIndex == NUM_EVADE_DIRECTIONS)
-            {
-                mEvadeDirectionIndex = 0;
-            }
+            mEvadeDirectionIndex = 0;
         }
     }
 

apps/openmw/mwmechanics/obstacle.hpp

@@ -65,7 +65,7 @@ namespace MWMechanics
             float mDistSameSpot; // take account of actor's speed
             int mEvadeDirectionIndex;
 
-            void chooseEvasionDirection(bool samePosition);
+            void chooseEvasionDirection();
     };
 }