diff --git a/src/EngineKit/Graphics/MeshData.cs b/src/EngineKit/Graphics/MeshData.cs
index ea10938..8f84e25 100644
--- a/src/EngineKit/Graphics/MeshData.cs
+++ b/src/EngineKit/Graphics/MeshData.cs
@@ -317,5 +317,8 @@ private void AddVertex(
         _uvs.Add(uv ?? Vector2.Zero);
         _realTangents.Add(realTangent ?? Vector4.Zero);
         _biTangents.Add(Vector3.Zero);
+        _tangents.Add(realTangent != null
+            ? new Vector3(realTangent.Value.X, realTangent.Value.Y, realTangent.Value.Z)
+            : Vector3.Zero);
     }
 }
\ No newline at end of file