MAPA (File Format): Difference between revisions

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(The Corruption format should actually be correct now)
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Revision as of 13:39, 7 October 2021

The .MAPA file format defines the minimap models used in the Metroid Prime series. MAPA or MAP Area consists of several sections: The header, Mappable Object entries, Vertices, Primitive Headers, and the primitives.

This file format needs more research
A few things are unknown in the header and Mappable Object Entries



The header is very straightforward, and has some minor differences depending on version.

Type Description MP1 MP2 MP3
u32 Magic; Always 0xDEADD00D
u32 Version; See below
u32 Type; unknown function in MP1/3, specifies whether the area appears on the Light (0) or Dark (1) map in MP2
u32 Visibility Mode;
  1. Always Visible (Map Universe Area)
  2. Visible on Visit or Map Station (most MP1 areas)
  3. Visible on Visit only (latter areas of Ruins and Phendrana)
  4. Never Visible
AABox Bounding Box
Vector3f Map Adjustment
u32 Unknown
u32 Mappable Object Count
u32 Vertex Count
u32 Primitive Count
u32 Environment Variable Section Size
u32 Environment Variable Count
End of Header


The version value listed above can have the following values:

Game Value
Metroid Prime 1 2
Metroid Prime 2: Echoes 3
Metroid Prime 3: Corruption 5

Environment Variables

Only exists in Corruption; used for some areas with Landing Sites.

Type Count Description
string Environment Variable Count Environment Variable
Pad to 4 bytes
End of Environment Variables

Mappable Objects

A Mappable Object in the Metroid Prime series can include: Elevators, Doors, and Save/Missile Stations. Each Mappable Object entry consists of the following struct:

Type Description MP1 & MP2 MP3
u32 Type; See table below for MP1 types
u32 Visibility Mode;
  1. Always Visible
  2. Visible on Map Station or Area Visit
  3. Visible on Door Visit
  4. Never Visible
  5. Visible on Map Station or Area Visit
u32 Editor ID; Same ID format as SCLY, indicates associated world object
GUID Saved State ID
u32 Unknown
Template:Transform4f Transform Matrix The Mappable Object's position in world space.
u32 * 4 Unknown
End of Mappable Object

MP1 Types

Type Description
0 Normal Door
1 Shield Door
2 Ice Door
3 Wave Door
4 Plasma Door
5 Big Door
6 Big Door 2
7 Ice Door Ceiling
8 Ice Door Floor
9 Wave Door Ceiling
10 Wave Door Floor
11 Plasma Door Ceiling
12 Plasma Door Floor
13 Ice Door Floor 2
14 Wave Door Floor 2
15 Plasma Door Floor 2
27 Down Arrow Yellow (Maintenance Tunnel)
28 Up Arrow Yellow (Phazon Processing Center)
29 Down Arrow Green (Elevator A)
30 Up Arrow Green (Elite Control Access)
31 Down Arrow Red (Elevator B)
32 Up Arrow Red (Fungal Hall Access)
33 Elevator
34 Save Station
37 Missile Station


Vertices are a simple array of CVector3f. Geometry in MAPAs is, almost always, centered around the origin (0, 0, 0) and are simplified, full sized, versions of the map they replicate. Each vertex is referenced at least twice: once for the primitive, once for the line border.

Primitive Headers

The Primitive headers are extremely simple, they merely have a bounding box followed by the primitive table start and end point, relative to the end of the current primitive header. In other words: read in the header, seek to the start of the table from the current position, then read the primitives tables.

Type Description
Vector3f Normal
Vector3f Center of Mass
u32 Primitive Table Start; relative to the end of the header
u32 Border Table Start; relative to the end of the header

Primitive Table

The Primitive is also fairly simple, each one consists of two parts: The GX Primitive list, and the Border list.

Type Description
u32 Primitive Count (PC)
Primitive * PC Primitives
u32 Border Count (BC)
Border * (BC) Borders


A primitive in a MAPA is a simple 4 byte aligned list of indices into the vertex list, starting with the GX Primitive type, a count, then an array of indices, each index taking up one byte.


A border in a MAPA is a simple count followed by a 4 byte aligned list indices into the vertex list, each index taking up one byte. A border is simply drawn using GX_LINESTRIP.