Presence flag
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The presence flags is a 16 bit parameter of KMP/OBJ and defined for which number of players an object is exists (visible and active).
First and wrong interpretation
The first interpretation of the flags were derived from Filesystem/Race/Course/koopa_course.szs/course.0:
<ObjDefine>
...
format sepa1_SW user_data 1 Bool 1
format sepa2_SW user_data 1 Bool 1
format sepa4_SW user_data 1 Bool 1
format sepaW1_SW user_data 1 Bool 1
format sepaW2_SW user_data 1 Bool 1
format sepaW4_SW user_data 1 Bool 1
</ObjDefine>
Because a usual presence flag has the value of 0x3f, the first (and wrong) interpretation was:
| Bit Number |
Hex Value |
First and wrong interpretation |
|---|---|---|
| 0 | 0x01 | Offline single player and time trials. |
| 1 | 0x02 | Offline 2 players. |
| 2 | 0x04 | Offline 3 or 4 players. |
| 3 | 0x08 | Online single player. |
| 4 | 0x10 | Online 2 players. |
| 5 | 0x20 | Online 3 or 4 players. |
Correct interpretation
In 2016, Wiimm tested all 16 possible bits of the flags and found a new interpretation: Only the 3 least significant bits are used, all other are ignored:
| Bit Number |
Hex Value |
Correct interpretation |
|---|---|---|
| 0 | 0x01 | Single player (offline and online) and time trials. |
| 1 | 0x02 | 2 players, offline and online. |
| 2 | 0x04 | 3 or 4 players, offline. |
| 3 | 0x08 | no meaning (ignored) |
| 4 | 0x10 | no meaning (ignored) |
| 5 | 0x20 | no meaning (ignored) |
It is important to hide objects for 2 players mode only, if they are decorative. Otherwise online players at split-screen will use another track than single players!
In other words: For objects with impact on the gameplay, bit 0 and bit 1 must be equal!
Typical values
The following table shows typical values. The second column (Same as) reduces the value to the 3 least significant bits:
| Value | Same as | Description | Usage |
|---|---|---|---|
| 0x00 | 0 | Object is always disabled. It's like not defined. | This value is used by custom track authors to disable objects temporary. |
| 0x01 | 1 | Object is only enabled for single player mode (offline and online), but not for 2 or more players. | — |
| 0x09 | This value is used by Nintendo to reduce slow motion bug at 2-player split screen. This value is only used to hide decorative objects like WLscreenGC, but never for objects with impact on the gameplay. | ||
| 0x39 | This value is used by many custom track authors to reduce slow motion bug. | ||
| 0x3f | 7 | Object is always enabled. | Standard value. |