COL (File Format): Difference between revisions

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{{under-construction}}
'''COL''' is a collision format used in [[Mario Kart Arcade GP DX]] and the successor of [[Mario Kart Arcade GP]] and [[Mario Kart Arcade GP 2]]'s [[MKAGP BIN]].
'''COL''' is a collision format used in [[Mario Kart Arcade GP DX]].


= File Format =
= File Format =
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| 0x00 || Char[4] || '''File magic'''. Always ''COL\0'' in ASCII.
| 0x00 || Char[4] || '''File magic'''. Always ''COL\0'' in ASCII.
|-
|-
| 0x04 || Byte[4] || Timestamp? Always 16 08 12 20 (2012-08-16?) The game specifically checks if this value is correct, otherwise it won't read the file.
| 0x04 || Byte[4] || Timestamp? Always 16 08 12 20 (2012-08-16?). The game specifically checks if this value is correct, otherwise it won't read the file.
|-
|-
| 0x08 || Int32 || '''Grid width''' ('''W''').
| 0x08 || Int32 || '''Grid width''' ('''W''').
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| 0x14 || Float || '''Grid cell Y size'''.
| 0x14 || Float || '''Grid cell Y size'''.
|-
|-
| 0x18 || Float[3] || '''AABB minimum coordinate'''.  
| 0x18 || Float[2] || '''AABB minimum coordinate XZ'''.
|-
|-
| 0x24 || Float[3] || '''AABB maximal coordinate'''.
| 0x20 || Float[2] || '''AABB maximum coordinate XZ'''.
|-
| 0x28 || Float[2] || '''Negative AABB minimum coordinate XZ'''. Unknown usage.
|}
|}


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| 0x00 || Int32 || '''Number of [[#Triangle|Triangles]]''' ('''T''').
| 0x00 || Int32 || '''Number of [[#Triangle|Triangles]]''' ('''T''').
|-
|-
| 0x04 || Int32 || '''Number of [[#Cube|Cubes]]''' ('''C''').
| 0x04 || Int32 || '''Number of [[#Wall|Walls]]''' ('''C''').
|}
|}


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! Offset !! Type !! Description
! Offset !! Type !! Description
|-
|-
| 0x00 || Float[4] || {{Unknown-left|'''Unknown'''.}}
| 0x00 || Float[2] || '''Minimal coordinate''' for this triangle.
|-
| 0x08 || Float[2] || '''Maximal coordinate''' for this triangle.
|-
|-
| 0x10 || Float[3][3] || '''Triangle vertices''' XYZ position.
| 0x10 || Float[3][3] || '''Triangle vertices''' XYZ position.
|-
|-
| 0x34 || Float[3][3] || {{Unknown-left|'''Unknown'''. Perhaps triangle normals or some kind of direction XYZ position?}}
| 0x34 || Float[3][3] || '''Triangle edges''' XYZ directions.
|-
|-
| 0x58 || Int32 || {{Unknown-left|'''Unknown'''. Maybe determines which edges of the triangle are surrounded by walls?}}
| 0x58 || UInt32 || '''Neighbour triangle flag''', used to determine which edges connect to other triangles.
|-
|-
| 0x5C || UInt32 || '''[[COL flag]]'''.
| 0x5C || UInt32 || '''[[COL flag]]'''.
|-
|-
| 0x60 || Float[4] || {{Unknown-left|'''Unknown'''.}}
| 0x60 || Float[3] || '''Triangle normal'''.
|-
| 0x6C || Float || '''Negative dot product''' between triangle center and triangle normal.
|}
|}


==== Cube ====
==== Wall ====
Followed by the cell's triangles, there are '''C''' 0x40 cubes, perhaps used for wall collision.
Followed by the cell's triangles, there are '''C''' 0x40 walls, which are used for wall collision detection. The walls are auto-generated from [[#Triangle|all triangles]] by checking which edges are missing neighbour triangles.


{| class="wikitable"
{| class="wikitable"
! Offset !! Type !! Description
! Offset !! Type !! Description
|-
|-
| 0x00 || Float[4][4] || {{Unknown-left|'''Unknown'''.}}
| 0x00 || Float[3] || '''Min XYZ''' of the triangle edge.
|-
| 0x0C || Float || {{Unknown-left|'''Unknown'''. Always 0.}}
|-
| 0x10 || Float[3] || '''Max XYZ''' of the triangle edge.
|-
| 0x1C || Float || {{Unknown-left|'''Unknown'''. Always 0.}}
|-
| 0x20 || Float[3] || '''Position 1 XYZ''' of the triangle edge forming the wall.
|-
| 0x2C || Float || {{Unknown-left|'''Unknown'''. Always 0.}}
|-
| 0x20 || Float[3] || '''Position 2 XYZ''' of the triangle edge forming the wall.
|-
| 0x3C || Float || {{Unknown-left|'''Unknown'''. Always 0.}}
|}
|}


== Secondary Grid ==
== Triangle Wall Grid ==
Followed by the grid, there's a secondary grid with unknown blocks. As of version 1.18 of Mario Kart Arcade GP DX, it only seems to be used in ''FM_L_N_HIT.col'' and ''FM_L_N_HIT_cam.col''.
Followed by the grid, there's a secondary grid with cells containing triangle walls. As of version 1.18 of Mario Kart Arcade GP DX, it only seems to be used in ''FM_L_N_HIT.col'' and ''FM_L_N_HIT_cam.col''.


=== Cell ===
=== Triangle Wall Cell ===
{| class="wikitable"
{| class="wikitable"
! Offset !! Type !! Description
! Offset !! Type !! Description
|-
|-
| 0x00 || Int32 || '''Number of [[#Unknown Section|Unknown sections]]''' ('''U''').
| 0x00 || Int32 || '''Number of [[#Triangle Wall|triangle walls]]''' ('''U''').
|}
|}


==== Unknown Section ====
==== Triangle Wall ====
Followed by the cell header, there are '''U''' 0x38 unknown sections.
Followed by the cell header, there are '''U''' 0x38 triangle walls. These are walls represented as triangles. Presumably this was added since [[#Wall|edge walls]] which are auto-generated couldn't represent certain walls.


{| class="wikitable"
{| class="wikitable"
! Offset !! Type !! Description
! Offset !! Type !! Description
|-
|-
| 0x00 || Int32 || {{Unknown-left|'''Unknown'''.}}
| 0x00 || Int32 || {{Unknown-left|'''Unknown'''. Possible collision flag indicating surface type.}}
|-
|-
| 0x04 || Float[3][3] || {{Unknown-left|'''Unknown'''.}}
| 0x04 || Float[3][3] || '''Triangle vertices''' XYZ position.
|-
|-
| 0x28 || Float[4] || {{Unknown-left|'''Unknown'''. Always 0.}}
| 0x28 || Float[4] || {{Unknown-left|'''Unknown'''. Always 0.}}

Latest revision as of 01:32, 14 July 2025

COL is a collision format used in Mario Kart Arcade GP DX and the successor of Mario Kart Arcade GP and Mario Kart Arcade GP 2's MKAGP BIN.

File Format

The file byte order is always little endian.

Header

The file starts with the following header:

Offset Type Description
0x00 Char[4] File magic. Always COL\0 in ASCII.
0x04 Byte[4] Timestamp? Always 16 08 12 20 (2012-08-16?). The game specifically checks if this value is correct, otherwise it won't read the file.
0x08 Int32 Grid width (W).
0x0C Int32 Grid length (L).
0x10 Float Grid cell X size.
0x14 Float Grid cell Y size.
0x18 Float[2] AABB minimum coordinate XZ.
0x20 Float[2] AABB maximum coordinate XZ.
0x28 Float[2] Negative AABB minimum coordinate XZ. Unknown usage.

Grid

Followed by the header, the grid data is read from the start of the AABB minimum coordinate, from left to right. A total of W * L cells are loaded.

Cell

Offset Type Description
0x00 Int32 Number of Triangles (T).
0x04 Int32 Number of Walls (C).

Triangle

Followed by the cell header, there are T 0x70 triangles.

Offset Type Description
0x00 Float[2] Minimal coordinate for this triangle.
0x08 Float[2] Maximal coordinate for this triangle.
0x10 Float[3][3] Triangle vertices XYZ position.
0x34 Float[3][3] Triangle edges XYZ directions.
0x58 UInt32 Neighbour triangle flag, used to determine which edges connect to other triangles.
0x5C UInt32 COL flag.
0x60 Float[3] Triangle normal.
0x6C Float Negative dot product between triangle center and triangle normal.

Wall

Followed by the cell's triangles, there are C 0x40 walls, which are used for wall collision detection. The walls are auto-generated from all triangles by checking which edges are missing neighbour triangles.

Offset Type Description
0x00 Float[3] Min XYZ of the triangle edge.
0x0C Float Unknown. Always 0.
0x10 Float[3] Max XYZ of the triangle edge.
0x1C Float Unknown. Always 0.
0x20 Float[3] Position 1 XYZ of the triangle edge forming the wall.
0x2C Float Unknown. Always 0.
0x20 Float[3] Position 2 XYZ of the triangle edge forming the wall.
0x3C Float Unknown. Always 0.

Triangle Wall Grid

Followed by the grid, there's a secondary grid with cells containing triangle walls. As of version 1.18 of Mario Kart Arcade GP DX, it only seems to be used in FM_L_N_HIT.col and FM_L_N_HIT_cam.col.

Triangle Wall Cell

Offset Type Description
0x00 Int32 Number of triangle walls (U).

Triangle Wall

Followed by the cell header, there are U 0x38 triangle walls. These are walls represented as triangles. Presumably this was added since edge walls which are auto-generated couldn't represent certain walls.

Offset Type Description
0x00 Int32 Unknown. Possible collision flag indicating surface type.
0x04 Float[3][3] Triangle vertices XYZ position.
0x28 Float[4] Unknown. Always 0.

Tools

The following tools can handle COL files:

  • (none)
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