# Enum.NegateOperationHiddenHistory

Roblox Engine API enum from Roblox Studio 0.744.0.7441077 (version-7aaa6838d36c4448).

- HTML page: https://rapi.sleaze.dev/enums/NegateOperationHiddenHistory/
- Roblox documentation: https://create.roblox.com/docs/reference/engine/enums/NegateOperationHiddenHistory

Records the CSG combination operation — Union or Intersection — that previously merged multiple [`NegateOperation`](https://rapi.sleaze.dev/classes/NegateOperation.md) parts, allowing the engine to restore the correct result type when those parts are later separated.

## Items

| Name | Value | Description |
| --- | --- | --- |
| `None` | 0 | Indicates no previous CSG combination operation is recorded for this [`NegateOperation`](https://rapi.sleaze.dev/classes/NegateOperation.md) part. This is the default value of `PreviousOperation`. |
| `NegatedUnion` | 1 | Indicates this [`NegateOperation`](https://rapi.sleaze.dev/classes/NegateOperation.md) was previously produced by a Union operation applied to multiple negated parts. |
| `NegatedIntersection` | 2 | Indicates this [`NegateOperation`](https://rapi.sleaze.dev/classes/NegateOperation.md) was previously produced by an Intersection operation applied to multiple negated parts. |

## Used by

Each entry lists the class, then the role and names of the members that use this type.

- [NegateOperation](https://rapi.sleaze.dev/classes/NegateOperation.md): property `PreviousOperation`