Merge pull request #8119 from sebavan/master

Side Orientation Fix

src/Meshes/mesh.ts

@@ -1774,7 +1774,8 @@ export class Mesh extends AbstractMesh implements IGetSetVerticesData {
 
         var sideOrientation: Nullable<number>;
 
-        if (!instanceDataStorage.isFrozen && this._effectiveMaterial.backFaceCulling) {
+        if (!instanceDataStorage.isFrozen &&
+            (this._effectiveMaterial.backFaceCulling || this.overrideMaterialSideOrientation !== null)) {
             let mainDeterminant = effectiveMesh._getWorldMatrixDeterminant();
             sideOrientation = this.overrideMaterialSideOrientation;
             if (sideOrientation == null) {