Update paper.md

Add clear Statement of Need

Author: DorianDepriester

paper/paper.md

@@ -39,7 +39,7 @@ In order to perform Finite Element Analysis (FEA) on a polycrystal, one needs to
 
 The criterion used by the previous authors for defining the GBs, called weight in the context of graph theory, was specially designed for cubic phases. The geometry was meshed using the Gmsh software [@Geuzaine:2009].
 
-The proposed software, named [`MTEX2Gmsh`](https://github.com/DorianDepriester/mtex2Gmsh), provides a customisable and robust method for generating a 2D mesh based on EBSD. Indeed, it works regardless the number of phases and the symmetries of those phases. In addition, it provides a smooth and accurate definition of the GBs. It is based on the MTEX toolbox for Matlab [@Bachmann:2011] and the Gmsh software. Figure 1 schematically illustrates the proposed algorithm. [`MTEX2Gmsh`](https://github.com/DorianDepriester/mtex2Gmsh) allows to mesh the volume with a couple of options, such as:
+As a conclusion, it appears that no existing tool for generating meshes from EBSD data is able to provide a robust grain description (e.g. suitable for any kind of phase and geometry) together with customizable features (e.g. variable element sizes). The proposed software, named [`MTEX2Gmsh`](https://github.com/DorianDepriester/mtex2Gmsh) works regardless the number of phases and the symmetries of those phases. In addition, it provides a smooth and accurate definition of the GBs. It is based on the MTEX toolbox for Matlab [@Bachmann:2011] and the Gmsh software. Figure 1 schematically illustrates the proposed algorithm. [`MTEX2Gmsh`](https://github.com/DorianDepriester/mtex2Gmsh) allows to mesh the volume with a couple of options, such as:
 
 * increasing element size with increasing distance from the grains boundaries;
 * element type (tetrahedron, wedge or brick elements);