# EntityManagerDifferOptions

> Parameters used to configure the the execution of the differ.

## Definition

* **Type:** Enum
* **Namespace:** [Unity.Entities](/engine/7000.0/script-reference/unity/entities.md)
* **Assembly:** UnityEngine.EntitiesModule

```csharp
[Flags]
public enum EntityManagerDifferOptions
```

## Fields

| Value                                                                                                                             | Description                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| --------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [ClearMissingReferences](/engine/7000.0/script-reference/unity/entities/entitymanagerdifferoptions/clearmissingreferences.md)     | If set; all references to destroyed or missing entities will be set to Entity.Null before computing changes.                                                                                                                                                                                                                                                                                                                                         |
| [Default](/engine/7000.0/script-reference/unity/entities/entitymanagerdifferoptions/default.md)                                   | The default set of options used by the EntityDiffer                                                                                                                                                                                                                                                                                                                                                                                                  |
| [FastForwardShadowWorld](/engine/7000.0/script-reference/unity/entities/entitymanagerdifferoptions/fastforwardshadowworld.md)     | If set; the shadow world will be updated with the latest changes.                                                                                                                                                                                                                                                                                                                                                                                    |
| [IncludeForwardChangeSet](/engine/7000.0/script-reference/unity/entities/entitymanagerdifferoptions/includeforwardchangeset.md)   | If set; the resulting [EntityChanges](/engine/7000.0/script-reference/unity/entities/entitychanges.md) will include the forward change set.                                                                                                                                                                                                                                                                                                          |
| [IncludeReverseChangeSet](/engine/7000.0/script-reference/unity/entities/entitymanagerdifferoptions/includereversechangeset.md)   | If set; the resulting [EntityChanges](/engine/7000.0/script-reference/unity/entities/entitychanges.md) will include the reverse change set.                                                                                                                                                                                                                                                                                                          |
| [None](/engine/7000.0/script-reference/unity/entities/entitymanagerdifferoptions/none.md)                                         | Shortcut for "no options required".                                                                                                                                                                                                                                                                                                                                                                                                                  |
| [UseReferentialEquality](/engine/7000.0/script-reference/unity/entities/entitymanagerdifferoptions/usereferentialequality.md)     | If set, components are not compared bit-wise. Bit-wise comparison implies that two components that have references to entities that have the same GUID but different indices/versions are different. Similarly blob asset references to blob assets that have the same hash but live at different addresses will be considered different as well. This is often not desirable. For these cases, it is more apt to check that GUIDs and hashes match. |
| [ValidateUniqueEntityGuid](/engine/7000.0/script-reference/unity/entities/entitymanagerdifferoptions/validateuniqueentityguid.md) | If this flag is set; the entire world is checks for duplicate [EntityGuid](/engine/7000.0/script-reference/unity/entities/entityguid.md) components.                                                                                                                                                                                                                                                                                                 |