Track Data Header (Track File Format)
The track data header starts at the short value at $100C + 0x1010, e.g. $384A for the Phoenix track. This is the starting position called $TDH in the table below.
The header is either 28 or 32 bytes long depending on whether the kerbs have two or three colors.
| Field | Type | Description | Comment |
|---|---|---|---|
| $TDH | short | Starting angle of first track segment | |
| +2 | short | Starting height of first segment | |
| +4 | short | X-coordinate of track center | ? in GP2 |
| +6 | short | Z-coordinate of track center | |
| +8 | short | Y-coordinate of track center | |
| +10 | short | Start width of 1st track segment | |
| +12 | short | Pole position side | 768 = right, -768 = left |
| +14 | short | Pit side | 0 = right, 10 = left |
| +15 | byte | Surrounding area color | 0 = green, 0xC0/192 = gray, 128=gray |
| +16 | byte | Starting width of right verge | |
| +17 | byte | Starting width of left verge | |
| +18 | byte | Kerb type (two or three colors) | 4 = three colors, otherwise 3 |
| +19 | byte | Unknown | Always 0 |
| +20 | byte | Unknown | Always 8 |
| +21 | byte | Unknown | Always 0 |
| +22 | byte | Kerb upper color | Index in special kerb palette |
| +23 | byte | Unknown | Always 0 |
| +24 | byte | Kerb lower color | Index in special kerb palette |
| +25 | byte | Unknown | Always 0 |
| +26 | byte | Unknown | Always 8 |
| +27 | byte | Unknown | Always 0 |
| +28 | byte | Kerb upper color 2 (if triple color) | Index in special kerb palette |
| +29 | byte | Unknown | Always 0 |
| +30 | byte | Kerb lower color 2 (if triple color) | Index in special kerb palette |
| +31 | byte | Unknown | Always 0 |