diff --git a/src/DotRecast.Core/Numerics/RcVec3f.cs b/src/DotRecast.Core/Numerics/RcVec3f.cs
index 2066a9d..8da28a6 100644
--- a/src/DotRecast.Core/Numerics/RcVec3f.cs
+++ b/src/DotRecast.Core/Numerics/RcVec3f.cs
@@ -109,13 +109,9 @@ namespace DotRecast.Core.Numerics
 
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public readonly RcVec3f Add(RcVec3f v2)
+        public static RcVec3f Add(RcVec3f left, RcVec3f right)
         {
-            return new RcVec3f(
-                X + v2.X,
-                Y + v2.Y,
-                Z + v2.Z
-            );
+            return left + right;
         }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -270,7 +266,11 @@ namespace DotRecast.Core.Numerics
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static RcVec3f operator +(RcVec3f left, RcVec3f right)
         {
-            return left.Add(right);
+            return new RcVec3f(
+                left.X + right.X,
+                left.Y + right.Y,
+                left.Z + right.Z
+            );
         }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
diff --git a/src/DotRecast.Detour.Crowd/DtCrowd.cs b/src/DotRecast.Detour.Crowd/DtCrowd.cs
index a0912a6..fe59f36 100644
--- a/src/DotRecast.Detour.Crowd/DtCrowd.cs
+++ b/src/DotRecast.Detour.Crowd/DtCrowd.cs
@@ -1273,7 +1273,7 @@ namespace DotRecast.Detour.Crowd
                         continue;
                     }
 
-                    ag.npos = ag.npos.Add(ag.disp);
+                    ag.npos = RcVec3f.Add(ag.npos, ag.disp);
                 }
             }
         }
diff --git a/src/DotRecast.Detour.Crowd/DtCrowdAgent.cs b/src/DotRecast.Detour.Crowd/DtCrowdAgent.cs
index b46b02a..1e37f78 100644
--- a/src/DotRecast.Detour.Crowd/DtCrowdAgent.cs
+++ b/src/DotRecast.Detour.Crowd/DtCrowdAgent.cs
@@ -117,7 +117,7 @@ namespace DotRecast.Detour.Crowd
             float ds = dv.Length();
             if (ds > maxDelta)
                 dv = dv.Scale(maxDelta / ds);
-            vel = vel.Add(dv);
+            vel = RcVec3f.Add(vel, dv);
 
             // Integrate
             if (vel.Length() > 0.0001f)
diff --git a/src/DotRecast.Detour/DtNavMesh.cs b/src/DotRecast.Detour/DtNavMesh.cs
index 4a1b7a0..b3b0606 100644
--- a/src/DotRecast.Detour/DtNavMesh.cs
+++ b/src/DotRecast.Detour/DtNavMesh.cs
@@ -1353,7 +1353,7 @@ namespace DotRecast.Detour
 
             bool overPoly = false;
             RcVec3f bmin = RcVec3f.Subtract(center, halfExtents);
-            RcVec3f bmax = center.Add(halfExtents);
+            RcVec3f bmax = RcVec3f.Add(center, halfExtents);
 
             // Get nearby polygons from proximity grid.
             List<long> polys = QueryPolygonsInTile(tile, bmin, bmax);
diff --git a/src/DotRecast.Detour/DtNavMeshQuery.cs b/src/DotRecast.Detour/DtNavMeshQuery.cs
index 8b86a07..21c460f 100644
--- a/src/DotRecast.Detour/DtNavMeshQuery.cs
+++ b/src/DotRecast.Detour/DtNavMeshQuery.cs
@@ -680,7 +680,7 @@ namespace DotRecast.Detour
 
             // Find tiles the query touches.
             RcVec3f bmin = RcVec3f.Subtract(center, halfExtents);
-            RcVec3f bmax = center.Add(halfExtents);
+            RcVec3f bmax = RcVec3f.Add(center, halfExtents);
             foreach (var t in QueryTiles(center, halfExtents))
             {
                 QueryPolygonsInTile(t, bmin, bmax, filter, query);
@@ -700,7 +700,7 @@ namespace DotRecast.Detour
             }
 
             RcVec3f bmin = RcVec3f.Subtract(center, halfExtents);
-            RcVec3f bmax = center.Add(halfExtents);
+            RcVec3f bmax = RcVec3f.Add(center, halfExtents);
             m_nav.CalcTileLoc(bmin, out var minx, out var miny);
             m_nav.CalcTileLoc(bmax, out var maxx, out var maxy);