# Defining zone types

<figure><img src="/files/rOhSSypKoyXqUu7mnUyN" alt=""><figcaption><p>Define Zone Type</p></figcaption></figure>

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 <img src="/files/itPVet8LiXWOERssnCsc" alt="" data-size="line"> | Gray <img src="/files/kTGYksWJAzI3reCsVzos" alt="" data-size="line"> |
| 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                                                        |

<figure><img src="/files/x762EIWAHoB4Z7WJoIeS" alt=""><figcaption><p>Audience and Boundary Zones</p></figcaption></figure>


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