3D modeler and limitations of Blitz3D

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What limitations does Blitz3D have that would keep me from designing my own 3D modeler? I'm talking about stuff that I simply can't get around. If there are simply too many limits that Blitz3D has, I think I could pull off making one in PureBasic with OpenGL, but I haven't even bought it yet so I'd have to drop another $60.

One problem I see is that you can't delete vertexes. But I don't I'd have too hard of a time cooking up an algorithm to just remake the object when a user deletes a vertex.

But are there any problems that have no way of getting around that would make it impossible to make a 3D modeler? I'm mainly asking this because I have yet to see anyone make a 3D modeler in Blitz3D yet... and there are some programs that are much more clever. But I'm still up to it.