Sets layer on all transforms and children

SetLayerRecursively.cs

// taken from: https://forum.unity.com/threads/change-gameobject-layer-at-run-time-wont-apply-to-child.10091/
// special thanks to: chadfranklin47

public static class ExtensionMethods
{
    public static void SetLayerRecursively(this Transform parent, int layer)
    {
        parent.gameObject.layer = layer;

        for (int i = 0, count = parent.childCount; i < count; i++)
        {
            parent.GetChild(i).SetLayerRecursively(layer);
        }
    }
}