Often material properties are nonlinear algebraic functions of the primary field variables, such as temperature, pressure, and chemical species, to name a few. Ansys Polydata allows you to customize the definition of material properties by defining one or more functions. This feature is referred to as the PMAT feature, because it makes use of the PMAT button at the top of the Ansys Polydata menu. The PMAT feature allows you to make a property dependent on local variables through algebraic functions that you define yourself.