---
title: "Packet 17: ChangePlayer"
description: "Changes an existing player's presentation state. Active modes use action 8 for a through-terrain/high-minimap marker."
canonical: "https://aosplay.net/protocol-168/packets/17"
markdown: "https://aosplay.net/docs/protocol-168/packets/17.md"
last_updated: "2026-07-16"
protocol: "Ace of Spades Battle Builder 168"
packet_id_decimal: "17"
packet_id_hex: "0x11"
direction: "S→C"
family: "Players"
implementation_status: "Sent"
evidence: "Implementation-backed"
wire_size: "4 or 5 bytes"
---

# Packet 17: ChangePlayer

> Changes an existing player's presentation state. Active modes use action 8 for a through-terrain/high-minimap marker.

- **Decimal ID:** 17
- **Hex ID:** 0x11
- **Direction:** S→C
- **Family:** Players
- **Status:** Sent
- **Evidence:** Implementation-backed
- **Wire size:** 4 or 5 bytes

## Exact wire layout

The application packet ID is the first byte. The remaining rows are in decode order. Byte sizes exclude ENet headers, wrapper prefixes, LZF chunk framing, and compression effects.

| # | Field | Encoding | Bytes | Purpose | Condition |
| ---: | --- | --- | ---: | --- | --- |
| 0 | `packet_id` | u8 | 1 | Always 17 (0x11). | — |
| 1 | `player_id` | i16 LE | 2 | Compact player-slot identifier. | — |
| 2 | `action` | u8 | 1 | 8 sets high minimap visibility; 9 sets chase-camera state. | — |
| 3 | `high_minimap_visibility` | boolean u8 | 1 | Expose the player through terrain/minimap. | action = 8 |
| 4 | `chase_cam` | boolean u8 | 1 | Chase-camera toggle. | action = 9 |

## Encoding conventions

- `LE` means least-significant byte first.
- `fixed16` is two-byte sign-magnitude at 1/64 precision.
- `orientation16` uses the measured 1/8192 orientation mapping.
- NUL strings consume their encoded byte length plus one `00` terminator.
- Counted arrays repeat immediately in the documented order.

## Related resources

- [HTML packet page](https://aosplay.net/protocol-168/packets/17)
- [Complete packet catalog](https://aosplay.net/protocol-168/packets)
- [Packet catalog in Markdown](https://aosplay.net/docs/protocol-168/packets.md)
- [Protocol 168 guide](https://aosplay.net/protocol-168)