Hi, I have something like that (simplified version for the playground) : http://www.babylonjs-playground.com/#272WDW#23 But when we move the mouse over the hole, the user don't necessarily know that he can click on the hole. So what I would like is an effect to know that we can click on. At the beggining, I thought to make a little zoom on the image which is behind the hole but i'm not convinced by this effect. (http://www.babylonjs-playground.com/#272WDW#24 - But, nice work iiceman ) What I thought, would be that at mouseover, display a border all around the edge of the hole (inner side) with a little blur effect. I don't find an exemple to illustrate what I say, I hope that what I say is understandable. I know it's possible to enable the edges of a polygon (but i don't know how), so i think we can use that, but I don't find anything like this on the forum or the documentation Thanks !