Don't apply fog on skybox by default (#16923)

Author: alexandremottet

packages/tools/viewer/src/viewer.ts

@@ -216,6 +216,7 @@ function createSkybox(scene: Scene, camera: Camera, reflectionTexture: BaseTextu
         hdrSkybox.material = hdrSkyboxMaterial;
         hdrSkybox.isPickable = false;
         hdrSkybox.infiniteDistance = true;
+        hdrSkybox.applyFog = false;
 
         updateSkybox(hdrSkybox, camera);