I really dont understand...... Help me..

when i imported a geometry file in comsol. that file is STL, VRML fomat.
But both of them is strange when COMSOL is imported that.
when i checked that files in another program such as ANSYS, Solidworks and other CAD programs,
its really good working.

But... why can't COMSOL read STl and VRML well?
I really wonder about that. So help me. if you know, tell me how i can put that file in comsol.....

i need that, please.

Thanks.