Flame CZE at 22:19, 13 February 2026

2026-02-13T22:19:56Z

Bokujishin: Created page with "== Introduction == The '''U'''ser '''C'''ontrol '''O'''bject packet is sent by LFS when a car interacts with an InSim circle or checkpoint. {| class="wikitable" |+ IS_UCO pa..."

2026-02-10T08:28:55Z

Created page with "== Introduction == The '''U'''ser '''C'''ontrol '''O'''bject packet is sent by LFS when a car interacts with an InSim circle or checkpoint. {| class="wikitable" |+ IS_UCO pa..."

New page

== Introduction ==

The '''U'''ser '''C'''ontrol '''O'''bject packet is sent by LFS when a car interacts with an InSim circle or checkpoint.

{| class="wikitable"
|+ IS_UCO packet properties
|-
! Type !! Name !! Description
|-
|byte
| Size
| 28
|-
|byte
| Type
| ISP_UCO
|-
|byte
| ReqI
| 0
|-
|byte
| PLID
| player's unique id
|-
|byte
| Sp0
|
|-
|byte
| UCOAction
| action (UCO_x)
|-
|byte
| Sp2
|
|-
|byte
| Sp3
|
|-
|unsigned
| Time
| ms since start (as in SMALL_RTP)
|-
|CarContOBJ
| C
|
|-
|ObjectInfo
| Info
| Info about the checkpoint or circle (see below)
|}

== Packet Details ==

=== Size ===

The size of the packet is always 28 bytes.

=== Type ===

The packet type from the [[InSim_enumerations#ISP|ISP_]] enumeration, always ISP_UCO.

=== ReqI ===

ReqI is equal to zero.

=== PLID ===

The unique player ID of the car that triggered the packet.

=== UCOAction ===

A value from the [[InSim_enumerations#UCO|UCO_]] enumeration:
* UCO_CIRCLE_ENTER: Entered a circle
* UCO_CIRCLE_LEAVE: Left a circle
* UCO_CP_FWD: Crossed a checkpoint in forward direction
* UCO_CP_REV: Crossed a checkpoint in reverse direction

=== Time ===

The timestamp of the event, in ms from the start of the session (as in [[InSim_enumerations#SMALL|SMALL_RTP]]).

=== C ===

A [[InSim_structs#CarContOBJ|CarContOBJ]] struct containing information about the car.

=== Info ===

An [[InSim_structs#ObjectInfo|ObjectInfo]] struct containing information about the circle or checkpoint.

An InSim checkpoint is identified by index 252. The checkpoint type is stored in the Flags bits 0 and 1:
* 00 = finish line
* 01 = 1st checkpoint
* 10 = 2nd checkpoint
* 11 = 3rd checkpoint
There is no specific way to uniquely identify multiple checkpoints of the same type, other than checking their coordinates.

An InSim circle is identified by index 253. The circle index (seen in the layout editor) is stored in the Heading byte.

[[Category:InSim packets]]

@@ Line 1: / Line 1: @@
-== Introduction ==
+{{Infobox InSim packet
 The '''U'''ser '''C'''ontrol '''O'''bject packet is sent by LFS when a car interacts with an InSim circle or checkpoint.
 {| class="wikitable"
@@ Line 52: / Line 62: @@
 | Info about the checkpoint or circle (see below)
 |}
 === Size ===
@@ Line 99: / Line 107: @@
 An InSim circle is identified by index 253. The circle index (seen in the layout editor) is stored in the Heading byte.
 [[Category:InSim packets]]

IS UCO - Revision history

Flame CZE at 22:19, 13 February 2026

Bokujishin: Created page with "== Introduction == The '''U'''ser '''C'''ontrol '''O'''bject packet is sent by LFS when a car interacts with an InSim circle or checkpoint. {| class="wikitable" |+ IS_UCO pa..."