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More investigation into .obj, document sprite composition in .set

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This commit is contained in:
Nick Thomas
2018-03-20 12:02:07 +00:00
parent fad7dec6ab
commit ee1d75d518
4 changed files with 55 additions and 2 deletions
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46
doc/formats/obj.md
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@@ -174,7 +174,49 @@ start of the second sprite in `pillar.obj`:
0x0078 1b 1b 4d 9e 1b 4c 1b 4d | M L M | 27 27 77 158 27 76 27 77
```
The first 24 bytes look quite different to the remainder of this file, lending
weight to the 24-byte header theory.
Total size is 3340. The first 24 bytes look quite different to the remainder of
this file, lending weight to the 24-byte header theory.
Line-by-line comparison:
a 0x0000 10 01 61 01 01 00 01 00 | a | 16 1 97 1 1 0 1 0
b 0x0000 fa 00 25 01 2e 00 48 00 | H | 250 0 37 1 46 0 72 0
a 0x0008 00 00 00 00 03 00 00 00 | | 0 0 0 0 3 0 0 0
b 0x0008 00 00 00 00 f4 0c 00 00 | | 0 0 0 0 244 12 0 0
a 0x0010 00 00 00 00 00 00 00 00 | | 0 0 0 0 0 0 0 0
b 0x0010 00 00 00 00 00 00 00 00 | | 0 0 0 0 0 0 0 0
Assuming a 24-byte header, 0x0c matches "remaining pixeldata" size in both cases
- 3 and 3316.
It's odd that the last 8 bytes of this putative header are empty in both cases.
I need to see if I can find any examples that store it.
0x04 makes sense as height & width, 2 16-bit values, in `blank.obj` where we
*know* it's 1x1 pixel.
It makes less sense as such for `pillar.obj` where the individual sprites fit
into the 64x64x64 volume of a cell:
![pillar.obj as individual sprites](img/pillar_6_sprites.png)
WH40K_TD.exe crashes trying to load a set referencing `pillar` in it unless it's
in the CENTER position. Interesting.
Next: keep adding cases to the header comparison above until I make sense of it
all. Since `pillar.obj` is composable, it's not the best example I could have
picked. Need more non-composable ones, in case that makes a difference.
| Offset | Purpose |
| ------ | ------- |
| 0x0000 | ?
| 0x0004 | ?
| 0x0008 | ?
| 0x000c | Size of remaining pixeldata |
| 0x0010 | Padding?
| 0x0014 | Padding?