Moved sideOrientation from material to mesh on gltf

loaders/src/glTF/2.0/glTFLoader.ts

@@ -742,6 +742,7 @@ export class GLTFLoader implements IGLTFLoader {
             const promises = new Array<Promise<any>>();
 
             const babylonMesh = new Mesh(name, this._babylonScene);
+            babylonMesh.overrideMaterialSideOrientation = this._babylonScene.useRightHandedSystem ? Material.CounterClockWiseSideOrientation : Material.ClockWiseSideOrientation;
 
             this._createMorphTargets(context, node, mesh, primitive, babylonMesh);
             promises.push(this._loadVertexDataAsync(context, primitive, babylonMesh).then((babylonGeometry) => {
@@ -1644,7 +1645,7 @@ export class GLTFLoader implements IGLTFLoader {
 
     private _createDefaultMaterial(name: string, babylonDrawMode: number): Material {
         const babylonMaterial = new PBRMaterial(name, this._babylonScene);
-        babylonMaterial.sideOrientation = this._babylonScene.useRightHandedSystem ? Material.CounterClockWiseSideOrientation : Material.ClockWiseSideOrientation;
+        // Moved to mesh so user can change materials on gltf meshes: babylonMaterial.sideOrientation = this._babylonScene.useRightHandedSystem ? Material.CounterClockWiseSideOrientation : Material.ClockWiseSideOrientation;
         babylonMaterial.fillMode = babylonDrawMode;
         babylonMaterial.enableSpecularAntiAliasing = true;
         babylonMaterial.useRadianceOverAlpha = !this._parent.transparencyAsCoverage;

src/Meshes/mesh.ts

@@ -1690,9 +1690,9 @@ export class Mesh extends AbstractMesh implements IGetSetVerticesData {
             sideOrientation = this.overrideMaterialSideOrientation;
             if (sideOrientation == null) {
                 sideOrientation = this._effectiveMaterial.sideOrientation;
-                if (effectiveMesh._getWorldMatrixDeterminant() < 0) {
-                    sideOrientation = (sideOrientation === Material.ClockWiseSideOrientation ? Material.CounterClockWiseSideOrientation : Material.ClockWiseSideOrientation);
-                }
+            }
+            if (effectiveMesh._getWorldMatrixDeterminant() < 0) {
+                sideOrientation = (sideOrientation === Material.ClockWiseSideOrientation ? Material.CounterClockWiseSideOrientation : Material.ClockWiseSideOrientation);
             }
             instanceDataStorage.sideOrientation = sideOrientation!;
         } else {