OBD:TRIA

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TRIA : Totoro Quaternion Body Index Array

Character file

Hex	Translation	Meaning
01 63 04 00	1123	01123-.TRIA
01 00 00 06	3	level 3
AD DE	dead	not used
13 00	19	19 bones in skeleton (first bone's data outlined in black)
Bone data structure (example : pelvis)
00	0	parent bone ID : none
01	1	child bone ID : left thigh
00	0	sibling bone ID : none
DE	dead	not used

Parent bone ID

Oni doesn't seem to need it

Child bone ID

The joint connects the current bone (same ID as the joint) and the child bone.

Sibling bone ID

"left leg" links to "right leg", which links to "mid" : they are all children of "pelvis"

"head" links to "left shoulder", which links to "right shoulder" : they are all children of "neck"

Bones

Bone/joint ID overview

HEX	DEC	Bone/Joint
00	00	pelvis/none
01	01	left thigh
02	02	left calf
03	03	left foot
04	04	right thigh
05	05	right calf
06	06	right foot
07	07	mid
08	08	chest
09	09	neck
0A	10	head
0B	11	left shoulder
0C	12	left arm
0D	13	left wrist
0E	14	left fist
0F	15	right shoulder
10	16	right arm
11	17	right wrist
12	18	right fist

(Thanks to ZDLO) (and not only him)

Note

"arm" is also sometimes referred to as "bicep"

(although correct spelling is "biceps")

Investigation

There are 2 different TRIA files in Oni. This one, used by most TRCM :

Bone	00	01	02	03	04	05	06	07	08	09	0A	0B	0C	0D	0E	0F	10	11	12
Parent	00	00	01	02	00	04	05	00	07	08	09	09	0B	0C	0D	09	0F	10	10
Child	01	02	03	00	05	06	00	08	09	0A	00	0C	0D	0E	00	10	11	12	00
Sibling	00	04	00	00	07	00	00	00	00	00	0B	0F	00	00	00	00	00	00	00

and this other one, used by extra-low-LOD (i.e. force-shield) TRCM of male scientists :

Bone	00	01	02	03	04	05	06	07	08	09	0A	0B	0C	0D	0E	0F	10	11	12
Parent	00	00	01	02	00	04	05	00	00	00	00	00	00	00	00	00	00	00	00
Child	01	02	03	00	05	06	00	00	09	0A	00	0C	0D	0E	00	10	11	12	00
Sibling	00	04	00	00	07	00	00	00	00	00	0B	0F	00	00	00	00	00	00	00

The "normal" one gives you a normal hierarchy :

0 + 1 - 2 - 3 - X
  + 4 - 5 - 6 - X
  - 7 - 8 - 9 + 10 - X
              + 11 - 12 - 13 - 14 - X
              - 15 - 16 - 17 - 18 - X

While the "low-LOD-doctor" one gives you a weird hierarchy :

0 + 1 - 2 - 3 - X
  + 4 - 5 - 6 - X
  - 7 - X
8 - 9 + 10 - X
      + 11 - 12 - 13 - 14 - X
      - 15 - 16 - 17 - 18 - X

(neglecting the fact that parent links are null for the upper part of the body). It looks like chest is directly parented by the root bone.

The associated TRTA is also weird. The only difference between the extra-low-LOD and the mormal-LOD TRTA of male scientists is the offset of chest.

In the normal-LOD TRTA, the offset is (1.4, 0, 0), whereas in the extra-low-LOD TRTA, it is (0, 0, 13.5). This again seems to indicate that chest is parented by the root bone.

And indeed...

If you specify e.g. Kerr's TRBS to use nothing but the extra-low-LOD TRCM

(and its TRTA and TRIA, which is the whole point), you'll see weird stuff.

(Kerr's upper body floating around, control limited to Kerr's legs and the weapon, if any)

Conclusion

Generally speaking, the TRTA and TRIA of low-LOD TRCM are ignored.

Any body in the TRBS uses the TRTA and TRIA of the extra-high-LOD TRCM

(i.e. the TRCM linked to at 0x18 in the TRBS)

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