Create geometry from a matrix

Hi everyone,

I am trying to create a geometry with Comsol 4.3 with Matlab 2012.
The geometry I want to create is very complex.
The geometry is defined by a matrix (the value 1 corresponding to the material and the 0 corresponding to outside the material).

I have no clue how to get started with that, and I didn't find any tutorial helping me.

Therefore my question is simple ? Do you know any way to create a geometry from a matrix file ?

Thank you so much.