diff --git a/src/DotRecast.Recast.Demo/Draw/NavMeshRenderer.cs b/src/DotRecast.Recast.Demo/Draw/NavMeshRenderer.cs
index 0ede906..352d7bf 100644
--- a/src/DotRecast.Recast.Demo/Draw/NavMeshRenderer.cs
+++ b/src/DotRecast.Recast.Demo/Draw/NavMeshRenderer.cs
@@ -86,7 +86,7 @@ public class NavMeshRenderer
             int tw = (gw + settings.tileSize - 1) / settings.tileSize;
             int th = (gh + settings.tileSize - 1) / settings.tileSize;
             float s = settings.tileSize * settings.cellSize;
-            _debugDraw.DebugDrawGridXZ(bmin[0], bmin[1], bmin[2], tw, th, s, DebugDraw.DuRGBA(0, 0, 0, 64), 1.0f);
+            _debugDraw.DebugDrawGridXZ(bmin.X, bmin.Y, bmin.Z, tw, th, s, DebugDraw.DuRGBA(0, 0, 0, 64), 1.0f);
         }
 
         if (navMesh != null && navQuery != null
diff --git a/src/DotRecast.Recast.Demo/Tools/GizmoRenderer.cs b/src/DotRecast.Recast.Demo/Tools/GizmoRenderer.cs
index bcf02fc..2b8cf87 100644
--- a/src/DotRecast.Recast.Demo/Tools/GizmoRenderer.cs
+++ b/src/DotRecast.Recast.Demo/Tools/GizmoRenderer.cs
@@ -43,8 +43,8 @@ public static class GizmoRenderer
         RcVec3f normal = new RcVec3f();
         for (int j = 0; j < 3; ++j)
         {
-            e0[j] = vertices[v1 + j] - vertices[v0 + j];
-            e1[j] = vertices[v2 + j] - vertices[v0 + j];
+            e0 = RcVecUtils.Subtract(vertices, v1, v0);
+            e1 = RcVecUtils.Subtract(vertices, v2, v0);
         }
 
         normal.X = e0.Y * e1.Z - e0.Z * e1.Y;
diff --git a/src/DotRecast.Recast.Demo/Tools/ObstacleSampleTool.cs b/src/DotRecast.Recast.Demo/Tools/ObstacleSampleTool.cs
index b02e568..e38688f 100644
--- a/src/DotRecast.Recast.Demo/Tools/ObstacleSampleTool.cs
+++ b/src/DotRecast.Recast.Demo/Tools/ObstacleSampleTool.cs
@@ -79,8 +79,8 @@ public class ObstacleSampleTool : ISampleTool
             else if (ob.state == DtObstacleState.DT_OBSTACLE_REMOVING)
                 col = DebugDraw.DuRGBA(220, 0, 0, 128);
 
-            dd.DebugDrawCylinder(bmin[0], bmin[1], bmin[2], bmax[0], bmax[1], bmax[2], col);
-            dd.DebugDrawCylinderWire(bmin[0], bmin[1], bmin[2], bmax[0], bmax[1], bmax[2], DebugDraw.DuDarkenCol(col), 2);
+            dd.DebugDrawCylinder(bmin.X, bmin.Y, bmin.Z, bmax.X, bmax.Y, bmax.Z, col);
+            dd.DebugDrawCylinderWire(bmin.X, bmin.Y, bmin.Z, bmax.X, bmax.Y, bmax.Z, DebugDraw.DuDarkenCol(col), 2);
         }
     }
 
diff --git a/src/DotRecast.Recast.Demo/Tools/TileSampleTool.cs b/src/DotRecast.Recast.Demo/Tools/TileSampleTool.cs
index 327989c..5b33b99 100644
--- a/src/DotRecast.Recast.Demo/Tools/TileSampleTool.cs
+++ b/src/DotRecast.Recast.Demo/Tools/TileSampleTool.cs
@@ -59,19 +59,19 @@ public class TileSampleTool : ISampleTool
             var s = settings.agentRadius;
 
             float ts = settings.tileSize * settings.cellSize;
-            int tx = (int)((_hitPos.X - bmin[0]) / ts);
-            int ty = (int)((_hitPos.Z - bmin[2]) / ts);
+            int tx = (int)((_hitPos.X - bmin.X) / ts);
+            int ty = (int)((_hitPos.Z - bmin.Z) / ts);
 
             RcVec3f lastBuiltTileBmin = RcVec3f.Zero;
             RcVec3f lastBuiltTileBmax = RcVec3f.Zero;
 
-            lastBuiltTileBmin[0] = bmin[0] + tx * ts;
-            lastBuiltTileBmin[1] = bmin[1];
-            lastBuiltTileBmin[2] = bmin[2] + ty * ts;
+            lastBuiltTileBmin.X = bmin.X + tx * ts;
+            lastBuiltTileBmin.Y = bmin.Y;
+            lastBuiltTileBmin.Z = bmin.Z + ty * ts;
 
-            lastBuiltTileBmax[0] = bmin[0] + (tx + 1) * ts;
-            lastBuiltTileBmax[1] = bmax[1];
-            lastBuiltTileBmax[2] = bmin[2] + (ty + 1) * ts;
+            lastBuiltTileBmax.X = bmin.X + (tx + 1) * ts;
+            lastBuiltTileBmax.Y = bmax.Y;
+            lastBuiltTileBmax.Z = bmin.Z + (ty + 1) * ts;
 
             dd.DebugDrawCross(_hitPos.X, _hitPos.Y + 0.1f, _hitPos.Z, s, DuRGBA(0, 0, 0, 128), 2.0f);
             dd.DebugDrawBoxWire(