Falcon 4 .OBJ file
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The OBJ file holds all the objectives in a mission. Objectives are basically static things, like towns, cities, bridges, bases. Things which cannot be moved.
Objectives are usually composed of features. Each feature being a particular part of the overall objective. So an airbase objective may have runway, hangar and control tower as features.
Objectives also have a fixed position on the map governed by their X, Y coordinates. They may also have:
a parent - an objective that they are a child of, used in the naming sometimes.
a name - an index into the strings file used to name the objective. 0 indicates the objective has no name of its own.
a campaign ID - ID2 - used to related things.
an owner - which side owns this objective.
a controller - which side actually controls the objective.
a type - an index into the OCD file showing which objective type this is.
Various flags associated with the objective
Details of each feature composing the objective, detailing how damaged it is.
A list of links to other objectives - this gives routes to other places.
Raw (compressed contents)
| Field | Data Type | Width (in bytes) | Description |
| NumObjectives | Signed 16-bit integer | 2 | Number of objective records in the data that follows |
| UncompressedSize | Signed 32-bit integer | 4 | Size, in bytes, of the data that follows, when it's uncompressed |
| CompressedSize | Signed 32-bit integer | 4 | Size, in bytes, of the compressed file to follow |
| DATA | byte[] | (CompressedSize) | LZSS-compressed binary data. |
Uncompressed contents of the DATA field
| Field | Data Type | Width (in bytes) | Description | Versions |
| objectiveRecords[] | ObjectiveRecord[NumObjectives] | | | All |
Structures Used
ObjectiveRecord structure
| Field | Data Type | Width (in bytes) | Description | Versions |
| objectiveType | unsigned 16-bit integer | 2 | | All |
| objective | ObjectiveClass | | | All |
ObjectiveClass structure
| Field | Data Type | Width (in bytes) | Description | Versions |
| id | VU_ID | 8 | | All |
| entityType | unsigned 16-bit integer | 2 | | All |
| x | Signed 16-bit integer | 2 | | All |
| y | Signed 16-bit integer | 2 | | All |
| z | single-precision 32-bit floating point | 4 | | >=70 |
| spotTime | unsigned 32-bit integer | 4 | | All |
| spotted | signed 16-bit integer | 2 | | All |
| baseFlags | signed 16-bit integer | 2 | | All |
| owner | byte | 1 | | All |
| campId | signed 16-bit integer | 2 | | All |
| lastRepair | unsigned 32-bit integer | 4 | | All |
| obj_flags | unsigned 32-bit integer | 4 | | >1 |
| obj_flags | unsigned 16-bit integer | 2 | | < = 1 |
| supply | byte | 1 | | All |
| fuel | byte | 1 | | All |
| losses | byte | 1 | | All |
| numStatuses | byte | 1 | | All |
| fStatus[] | byte[numStatuses] | (numStatuses) bytes | | All |
| priority | byte | 1 | | All |
| nameId | Signed 16-bit integer | 2 | | All |
| parent | VU_ID | 8 | | All |
| first_owner | byte | 1 | | All |
| numLinks | byte | 1 | | All |
| link_data[] | ObjectiveLink[numLinks] | | | All |
| hasRadarData | byte | 1 | | >=20 |
| detect_ratio[] | array of single-precision 32-bit floating point * 8 | 4*8 = 32 bytes | Only present if hasRadarData field <> 0 | >=20 |
ObjectiveLink structure
| Field | Data Type | Width (in bytes) | Description |
| costs[] | byte[8] | 8 | |
| newId | VU_ID | 8 | |
VU_ID structure
| Field | Data Type | Width (in bytes) | Description |
| num_ | unsigned 32-bit integer | 4 | |
| creator_ | unsigned 32-bit integer | 4 | |
