This checkbox allows you to select whether shade surface objects should be applied to the model. Enabled shade surfaces will be listed in the Navigator, displayed on the Edit screen as planes of various colours, rendered on the Visualisation screen and included in Radiance daylighting and EnergyPlus simulations as shading surfaces.
Shade surfaces that are not selected are not removed from the model entirely and can be displayed again by changing selections on this dialog.
Note: For shade surface planes that are shown, the Component block shades and reflects option on the Constructions tab can be unchecked to prevent particular planes from being included in the EnergyPlus simulations.