OBD:CRSA

ssg's version is here

CRSA - Corpse Array

Related : File types Level files Oni Binary Data

A CRSA file consists of

• a 32-byte header that specifies the size S and the capacity C of the corpse array
• S corpse chunks with actual corpse data (1100 bytes each)
• (C - S) unused corpse chunks integrally set to 0 (1100 bytes each)

The capacity C is always 20. The size of a chunk is not specified in the header : it's fixed by the "universal" bone count in Oni (19 bones).

• the resulting file is completed to a 32-byte multiple with the 0xADDE blank filler

Since the capacity of the array is always the same (20 corpses), CRSA files are all the same size (0x5620 bytes) : actual arrays take up 0x5610 bytes, and the last 16 bytes are filled with the blank filler 0xADDE.

Header

What's in the header?

• File ID and level ID as usual : 4 bytes each
• A blank field filled with 0xADDE (dead) : 12 bytes
• Array size (number of corpses) duplicated : 2*4 bytes
• Array capacity (maximum number of corpses, always 20) : another 4 bytes

The total size of a header is thus 0x20 = 32 bytes.

Example

00565-.CRSA in level3_Final.dat

Header of the Corpse Array file

Offset	Raw hex/string	Value	Meaning
0x00	01 35 02 00	565	File ID for 00565-.CRSA
0x04	01 00 00 06	3	Level ID
0x08 0x0C 0x010	AD DE AD DE AD DE AD DE AD DE AD DE	DEAD	blank filler
0x14	11 00 00 00	17	17 corpses (array size)
0x18	11 00 00 00	17	17 corpses (array size again)
0x1C	14 00 00 00	20	Room for 20 corpses (array capacity)

Corpses

They make up the actual array. They follow the header directly

What's in a corpse?

• A space for notes (160 bytes) : often the name of the file the corpse was taken from when packing the array.
• A link to the ONCC (model that should be used for the corpse) : that's 4 bytes as usual.
• Then, 19 bones, each of them defined by absolute orientation and position (unlike in a TRAM, where orientations are relative)
  Every bone is (3*3 + 3)*4 = 48 bytes, so that's 19*48 = 912 bytes.
• Finally, an axis-aligned bounding box (2*3*4 = 24 bytes)

The total size of a corpse is thus 1100 bytes.

What's in a bone?

The absolute orientation is defined in a "heavy" way via an orthonormal trihedron :

three 3D vectors x, y and z, each of length 1, at right angles with each other, and ordered "directly"

(like Oni's world axes : if x points left and y points up then z points to front, not back).

Each one of those vectors is stored as 3 floats (3*4 bytes), first x, then y, then z (so 3*3*4 = 36 bytes in total).

The absolute position R of a bone (of its parent node, actually) is stored as 3 floats right after the orientation trihedron.

That's another 12 bytes, so 48 bytes in total.

Reminder : the 2nd coordinate of R aka y is the height; same for x, y and z.

Example

first corpse of 00565-.CRSA in level3_Final.dat.

Offsets are measured from the start of the corpse chunk : add 0x20 for the offset from the start of file.

Notes and ONCC link

Offset	Raw hex	Value	Meaning
0x00	_lvl_3_Intro_TCL_A_corpse.dat		probably the name of the source file
0xA0	01 36 02 00	566	Link to 00566-TCTF_lite_1.ONCC

Bone orientation and position

Offset	Bone	Raw hex	Value/Meaning
0xA4 0xB0 0xBC 0xC8	Pelvis	C1 74 66 3F 00 78 3E 3D 45 AB DD 3E A6 8B 7D 3D 19 73 7F BF EE 67 B0 BC 03 AE DC 3E 82 2C 3D 3D 8D B2 66 BF C5 FA E7 41 2E 2B CB C1 58 B4 45 C1	x = (0.900219, 0.046501, 0.432947) y = (0.061901, -0.997850, -0.021534) z = (0.431015, 0.0461850, -0.901162) R = (28.997446, -25.396084, -12.356529)
0xD4 0xE0 0xEC 0xF8	Lt Thigh	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )
0x104 0x110 0x11C 0x128	Lt Calf	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )
0x134 0x140 0x14C 0x158	Lt Foot	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )
0x164 0x170 0x17C 0x188	Rt Thigh	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )
0x194 0x1A0 0x1AC 0x1B8	Rt Calf	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )
0x1C4 0x1D0 0x1DC 0x1E8	Rt Foot	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )
0x1F4 0x200 0x20C 0x218	Mid	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )
0x224 0x230 0x23C 0x248	Chest	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )
0x254 0x260 0x26C 0x278	Neck	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )
0x284 0x290 0x29C 0x2A8	Head	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )
0x2B4 0x2C0 0x2CC 0x2D8	Lt Shoulder	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )
0x2E4 0x2F0 0x2FC 0x308	Lt Arm	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )
0x314 0x320 0x32C 0x338	Lt Wrist	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )
0x344 0x350 0x35C 0x368	Lt Fist	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )
0x374 0x380 0x38C 0x398	Rt Shoulder	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )
0x3A4 0x3B0 0x3BC 0x3C8	Rt Arm	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )
0x3D4 0x3E0 0x3EC 0x3F8	Rt Wrist	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )
0x404 0x410 0x41C 0x428	Rt Fist	...	x = (, , ) y = (, , ) z = (, , ) R = (, , )

Axis-aligned bounding box

Offset	Raw hex	Value	Meaning
0x434	D4 22 8C 41 95 50 E9 C1 BC 31 9C C1	(17.517006, -29.164347, -19.524284)	"minimal" corner of the AABB
0x440	75 E6 14 42 2E 20 B1 C1 07 B1 D3 C0	(37.225056, -22.140713, -6.615360)	"maximal" corner of the AABB

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Screenshot

The example is the same as above : 00565-.CRSA in level3_Final.dat

The first corpse chunk has been outlined in black.