This section discusses how to activate or freeze the Viewfactors Calculator solver. The Viewfactors Calculator solver is activated by default, after Viewfactors Calculator has been selected in the Physics Model Selection dialog and a case geometry has been imported. To deactivate the solver, select the Viewfactors Calculator node under the Solvers node, as shown below. The solver can be deactivated by selecting Solver Frozen in the Properties window.