You can bake it in like this on lines 260-261
https://playground.babylonjs.com/#SHBR9S#47
hexTilePrefab.position.copyFrom(hexTilePrefab.getBoundingInfo().boundingBox.center).scaleInPlace(-1);
hexTilePrefab.bakeCurrentTransformIntoVertices();
You can bake it in like this on lines 260-261
https://playground.babylonjs.com/#SHBR9S#47
hexTilePrefab.position.copyFrom(hexTilePrefab.getBoundingInfo().boundingBox.center).scaleInPlace(-1);
hexTilePrefab.bakeCurrentTransformIntoVertices();