Data and Mesh Regions
Mathematica Version 10 adds full support for mesh-based geometric regions. Mesh-based regions can be explicitly specified or automatically generated from lists of points, from graphics, or from other regions. Mesh-based regions are flexible enough to approximate any other region and support fast algorithms for essentially any operation. The mesh-based regions fully support the geometric region framework, including computing properties (area, nearest point, etc.) and being used as inputs to solvers (integration, solving PDEs, etc.).