diff --git a/src/DotRecast.Detour.Crowd/DtCrowd.cs b/src/DotRecast.Detour.Crowd/DtCrowd.cs
index acf85e7..722c1df 100644
--- a/src/DotRecast.Detour.Crowd/DtCrowd.cs
+++ b/src/DotRecast.Detour.Crowd/DtCrowd.cs
@@ -581,7 +581,7 @@ namespace DotRecast.Detour.Crowd
                     {
                         throw new ArgumentException("Empty path");
                     }
-                    
+
 
                     // Quick search towards the goal.
                     _navQuery.InitSlicedFindPath(path[0], ag.targetRef, ag.npos, ag.targetPos,
@@ -1178,10 +1178,8 @@ namespace DotRecast.Detour.Crowd
                     }
                     else
                     {
-                        var nsnvel = _obstacleQuery.SampleVelocityGrid(ag.npos, ag.option.radius,
-                            ag.desiredSpeed, ag.vel, ag.dvel, option, vod);
-                        ns = nsnvel.Item1;
-                        ag.nvel = nsnvel.Item2;
+                        ns = _obstacleQuery.SampleVelocityGrid(ag.npos, ag.option.radius,
+                            ag.desiredSpeed, ag.vel, ag.dvel, out ag.nvel, option, vod);
                     }
 
                     _velocitySampleCount += ns;
diff --git a/src/DotRecast.Detour.Crowd/DtObstacleAvoidanceQuery.cs b/src/DotRecast.Detour.Crowd/DtObstacleAvoidanceQuery.cs
index 68d981b..c6c1620 100644
--- a/src/DotRecast.Detour.Crowd/DtObstacleAvoidanceQuery.cs
+++ b/src/DotRecast.Detour.Crowd/DtObstacleAvoidanceQuery.cs
@@ -319,7 +319,7 @@ namespace DotRecast.Detour.Crowd
             return penalty;
         }
 
-        public Tuple<int, RcVec3f> SampleVelocityGrid(RcVec3f pos, float rad, float vmax, RcVec3f vel, RcVec3f dvel,
+        public int SampleVelocityGrid(RcVec3f pos, float rad, float vmax, RcVec3f vel, RcVec3f dvel, out RcVec3f nvel,
             DtObstacleAvoidanceParams option, DtObstacleAvoidanceDebugData debug)
         {
             Prepare(pos, dvel);
@@ -328,7 +328,7 @@ namespace DotRecast.Detour.Crowd
             m_vmax = vmax;
             m_invVmax = vmax > 0 ? 1.0f / vmax : float.MaxValue;
 
-            RcVec3f nvel = RcVec3f.Zero;
+            nvel = RcVec3f.Zero;
 
             if (debug != null)
                 debug.Reset();
@@ -359,7 +359,7 @@ namespace DotRecast.Detour.Crowd
                 }
             }
 
-            return Tuple.Create(ns, nvel);
+            return ns;
         }
 
         // vector normalization that ignores the y-component.