# Defining zone types

Define Zone Type

Zones have two different types: Audience Zones and Boundary Zones. A zone’s type defines how it interacts in the simulation and its behavior when added to a Coverage Beam for optimization. Imported Zones will retain the zone types defined in SketchUp, but you can also change a zone’s type in HOLOPLOT Plan if it is imported. You can change the type of zone using the dropdown menu in the Properties Panel when a zone is selected. This will change the zone color in the Viewport. The table below contains information on the different zone types and their properties. | | Audience Zone | Boundary Zone | | ------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Display color | Blue | Gray | | Used in Coverage Beams | Yes | Yes | | Visible in Simulation | Yes | Yes | | Simulation Properties when Acoustic Shadowing Off | Acoustically transparent | Acoustically transparent | | Simulation Properties when Acoustic Shadowing On | Receives shadows | Casts shadows |

Audience and Boundary Zones