[The Adventurer]

I'm experimenting with Sludge for a possible Adventure game project, but I've hit a road block.

Here's my experiment room



Yeah I know it looks like a pond, it's ground.

Anyway, While I got the Z buffer working to walk behind the island and the mushroom...tree.

But I can't seem to figure out how to make the island unwalkable. My guy keeps walking through it when I click passed it, or teleports INSIDE it when I click on it.

So is this a short fall of the engine? or something I'm missing?

Thanks.