Undo change to shadow matrix calculation

src/Lights/directionalLight.ts

@@ -203,15 +203,9 @@ export class DirectionalLight extends ShadowLight {
         var xOffset = this._orthoRight - this._orthoLeft;
         var yOffset = this._orthoTop - this._orthoBottom;
 
-        if (this.getScene().useRightHandedSystem) {
-            Matrix.OrthoOffCenterRHToRef(this._orthoLeft - xOffset * this.shadowOrthoScale, this._orthoRight + xOffset * this.shadowOrthoScale,
-                this._orthoBottom - yOffset * this.shadowOrthoScale, this._orthoTop + yOffset * this.shadowOrthoScale,
-                this.shadowMinZ !== undefined ? this.shadowMinZ : activeCamera.minZ, this.shadowMaxZ !== undefined ? this.shadowMaxZ : activeCamera.maxZ, matrix);
-        } else {
-            Matrix.OrthoOffCenterLHToRef(this._orthoLeft - xOffset * this.shadowOrthoScale, this._orthoRight + xOffset * this.shadowOrthoScale,
-                this._orthoBottom - yOffset * this.shadowOrthoScale, this._orthoTop + yOffset * this.shadowOrthoScale,
-                this.shadowMinZ !== undefined ? this.shadowMinZ : activeCamera.minZ, this.shadowMaxZ !== undefined ? this.shadowMaxZ : activeCamera.maxZ, matrix);
-        }
+        Matrix.OrthoOffCenterLHToRef(this._orthoLeft - xOffset * this.shadowOrthoScale, this._orthoRight + xOffset * this.shadowOrthoScale,
+            this._orthoBottom - yOffset * this.shadowOrthoScale, this._orthoTop + yOffset * this.shadowOrthoScale,
+            this.shadowMinZ !== undefined ? this.shadowMinZ : activeCamera.minZ, this.shadowMaxZ !== undefined ? this.shadowMaxZ : activeCamera.maxZ, matrix);
     }
 
     protected _buildUniformLayout(): void {