How to get deform information from animating character's mesh

I want to export an character’s mesh as .obj file.
It’s easy to do it by the script objExporter.
But there is a problem that it can’t export an animating mesh.
Because the script only get the original mesh (before animating) from MeshFilter.
So if i wish to get the correctly mesh i want, i must know how these mesh deform.
Is there any idea about how to make correctly deformation to those vertices data?

I found a useful solution here!
get skinned vertices in real time
Combine this with objExporter still work well.
Only one thing should be noticed that the computation in this solution is very heavy.
So i just compute the matrices when i want to export the object.