# About hypotheses

Hypotheses represent boundary conditions which will be taken into account at calculations of meshes or submeshes basing on geometrical objects. These hypotheses allow you to manage the level of detail of the resulting meshes or submeshes: when applying different hypotheses with different parameters you can preset the quantity of meshing elements which will compose your mesh. So, it will be possible to generate a rough or a more refined mesh or submesh. In SMESH there are the following basic hypotheses:

- For meshing of edges:

- Local Length

- Number of segments

- For meshing of faces:

- Max Element Area

- For meshing of volumes:

- Max Element Volume

The choice of a hypothesis depends on:

- the geometrical object (shape) which will be meshed

- the algorithm, which will be selected for meshing of this geometrical object (shape)