Y does it step through...?

[VampireHeart]

Im using the Illidan(evil)X model for the castle doodads http://hiveworkshop.com/resources_new/models/1341/ and i wanted it so a unit could step on top of it. So i put some invis platforms in but it still sinks through y is this?

 

[The guy who needs help]

the base model should be a ramp so modelst go up the stairs not trhough them if thats what ure asking

 

[VampireHeart]

thx i was using the stone wall model so no wonder!