I was modeling a 3Ds House in 3Ds max for a tag scenery. So, when i use tool collision-geometry i got a error about overlaping surfaces, tool dont create a .wrl file so i decide to search the problem in my map, there is a little polygons with a glicthy textures, someone tell me that the problem is because you have 2 faces in a same edge (I didnīt understand) i delete the faces and the glitchy problem stopped, but I have now open edges, ŋAnother strategy to fix it?! Thanks

Border selection mode, select all borders (on entire model)
click "cap"
select all verts, weld at 0.01.

You can only use border selection if your model is an editable poly. Simply convert it to a poly, cap your open edges, and either convert to an editable mesh or leave it the way it is (I don't think too has a preference). Keep in mind that the cap function doesn't always work, or at least the way you want it to. If that's the case, you're going to have to create the faces to cap those open edges yourself, but that's not too hard to do.

Still not working! :/ i donīt know whats going wrong, i donīt think that the letter "Ņ" make this problem. I used STL chek, and i donīt have OPEN EDGES! :S

stl check does not work like tool.