diff --git a/CHANGELOG.md b/CHANGELOG.md
index 818ba22..30140eb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Removed RcVecUtils.Dot()
 - Removed RcVecUtils.Scale()
 - Removed RcVecUtils.Subtract(RcVec3f i, float[] verts, int j)
+- Removed RcVecUtils.Subtract(float[] verts, int i, int j)
 - Removed RcMeshDetails.VdistSq2(float[], float[])
 
 ### Special Thanks
diff --git a/src/DotRecast.Core/Numerics/RcVecUtils.cs b/src/DotRecast.Core/Numerics/RcVecUtils.cs
index 65b24ff..5d5de00 100644
--- a/src/DotRecast.Core/Numerics/RcVecUtils.cs
+++ b/src/DotRecast.Core/Numerics/RcVecUtils.cs
@@ -74,16 +74,6 @@ namespace DotRecast.Core.Numerics
         }
 
 
-        [MethodImpl(MethodImplOptions.AggressiveInlining)]
-        public static RcVec3f Subtract(float[] verts, int i, int j)
-        {
-            return new RcVec3f(
-                verts[i] - verts[j],
-                verts[i + 1] - verts[j + 1],
-                verts[i + 2] - verts[j + 2]
-            );
-        }
-
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static void Cross(float[] dest, float[] v1, float[] v2)
         {
diff --git a/src/DotRecast.Recast.Demo/Tools/GizmoRenderer.cs b/src/DotRecast.Recast.Demo/Tools/GizmoRenderer.cs
index a6f4083..987a081 100644
--- a/src/DotRecast.Recast.Demo/Tools/GizmoRenderer.cs
+++ b/src/DotRecast.Recast.Demo/Tools/GizmoRenderer.cs
@@ -36,16 +36,11 @@ public static class GizmoRenderer
         }
     }
 
-    public static int GetColorByNormal(float[] vertices, int v0, int v1, int v2)
+    public static int GetColorByNormal(RcVec3f v0, RcVec3f v1, RcVec3f v2)
     {
-        RcVec3f e0 = new RcVec3f();
-        RcVec3f e1 = new RcVec3f();
         RcVec3f normal = new RcVec3f();
-        for (int j = 0; j < 3; ++j)
-        {
-            e0 = RcVecUtils.Subtract(vertices, v1, v0);
-            e1 = RcVecUtils.Subtract(vertices, v2, v0);
-        }
+        RcVec3f e0 = v1 - v0;
+        RcVec3f e1 = v2 - v0;
 
         normal.X = e0.Y * e1.Z - e0.Z * e1.Y;
         normal.Y = e0.Z * e1.X - e0.X * e1.Z;
@@ -160,13 +155,13 @@ public static class GizmoRenderer
         debugDraw.Begin(DebugDrawPrimitives.TRIS);
         for (int i = 0; i < trimesh.triangles.Length; i += 3)
         {
-            int v0 = 3 * trimesh.triangles[i];
-            int v1 = 3 * trimesh.triangles[i + 1];
-            int v2 = 3 * trimesh.triangles[i + 2];
-            int col = GetColorByNormal(trimesh.vertices, v0, v1, v2);
-            debugDraw.Vertex(trimesh.vertices[v0], trimesh.vertices[v0 + 1], trimesh.vertices[v0 + 2], col);
-            debugDraw.Vertex(trimesh.vertices[v1], trimesh.vertices[v1 + 1], trimesh.vertices[v1 + 2], col);
-            debugDraw.Vertex(trimesh.vertices[v2], trimesh.vertices[v2 + 1], trimesh.vertices[v2 + 2], col);
+            RcVec3f v0 = RcVecUtils.Create(trimesh.vertices, 3 * trimesh.triangles[i]);
+            RcVec3f v1 = RcVecUtils.Create(trimesh.vertices, 3 * trimesh.triangles[i + 1]);
+            RcVec3f v2 = RcVecUtils.Create(trimesh.vertices, 3 * trimesh.triangles[i + 2]);
+            int col = GetColorByNormal(v0, v1, v2);
+            debugDraw.Vertex(v0.X, v0.Y, v0.Z, col);
+            debugDraw.Vertex(v1.X, v1.Y, v1.Z, col);
+            debugDraw.Vertex(v2.X, v2.Y, v2.Z, col);
         }
 
         debugDraw.End();