Before mesh import was available (even in beta) it wasn't possible (obviously) to bring mesh in to SL.<br>
Some enterprising individuals tried to make mesh to prim converters but
due to the complex mathematics it wasn't at all easy to do.<br>
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Flipping that on it's head, however, it should be trivial
(mathematically speaking) to do the opposite which is convert a prim
linkset into a mesh.<br>
<br>
The upside of that is that it would enable in-world creation of meshes with the very easy to use in world tools.