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AdamuSw/docs/Packets/C1-46-ChangeTerrainAttributes_by-server.md
2026-07-14 19:00:35 +03:00

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# C1 46 - ChangeTerrainAttributes (by server)
## Is sent when
The server wants to alter the terrain attributes of a map at runtime.
## Causes the following actions on the client side
The client updates the terrain attributes on its side.
## Structure
| Index | Length | Data Type | Value | Description |
|-------|--------|-----------|-------|-------------|
| 0 | 1 | Byte | 0xC1 | [Packet type](PacketTypes.md) |
| 1 | 1 | Byte | | Packet header - length of the packet |
| 2 | 1 | Byte | 0x46 | Packet header - packet type identifier |
| 3 | 1 | Boolean | false | Type |
| 4 | 1 | TerrainAttributeType | | Attribute |
| 5 | 1 | Boolean | | RemoveAttribute; When this is true, the attribute is removed on the client side. If it's false, then the attribute is added. |
| 6 | 1 | Byte | | AreaCount |
| 7 | TerrainArea.Length * AreaCount | Array of TerrainArea | | Areas |
### TerrainArea Structure
Defines the area which should be changed.
Length: 4 Bytes
| Index | Length | Data Type | Value | Description |
|-------|--------|-----------|-------|-------------|
| 0 | 1 | Byte | | StartX |
| 1 | 1 | Byte | | StartY |
| 2 | 1 | Byte | | EndX |
| 3 | 1 | Byte | | EndY |
### TerrainAttributeType Enum
Defines the attribute which should be set/unset. It's a Flags enumeration.
| Value | Name | Description |
|-------|------|-------------|
| 1 | Safezone | The coordinate is a safezone. |
| 2 | Character | The coordinate is occupied by a character. |
| 4 | Blocked | The coordinate is blocked and can't be passed by a character. |
| 8 | NoGround | The coordinate is blocked, because there is no ground and can't be passed by a character. |
| 16 | Water | The coordinate is blocked by water and can't be passed by a character. |