# GlossaryΒΆ

**Fieldwork Model/Mesh**: A Fieldwork model or mesh is a piece-wise parametric mesh used by the GIAS2 library. Most bone meshes used by current MAP Client plugins are Fieldwork models. A Fieldwork mesh is composed of an ensemble of elements interpolated by Lagrange polynomials controlled by the coordinates of nodes within each element.A Fieldwork model has 3 main components: 1) its nodal coordinates which define the meshes geometry, 2) the type of Lagrange polynomials used to interpolate each element, 3) and the connectivity and shapes of the element. As such, a Fieldwork model is serialised into 3 files:

**.geof**: a GeometricField file that contains the nodal coordinates, and therefore the geometry of the mesh;**.ens**: an Ensemble file that contains information about the polynomial functions of the mesh’s elements.;**.mesh**: a Mesh file that contains the connectivity of mesh elements and the shape of each element.

Fieldwork meshes can share the same .ens and .mesh files if they have the same mesh topology and polynomial functions. Therefore, it is not alway necessary to write out the .ens and .mesh files. For example, if a workflow reads in an existing Fieldwork mesh (see Fieldwork Model Source Step), fits it to some pointcloud, then writes the mesh to file, only the .geof file needs to be written since the mesh topology and polynomial functions have not changed, only its geometry.