OBD:TRTA

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TRTA : Totoro Quaternion Body Translation Array

Character file

Hex	Translation	Meaning
01 62 04 00	1122	01122-.TRTA
01 00 00 06	3	level 3
AD DE	dead	not used
13 00	19	19 bone offsets in array (first bone offset is outlined in black)
Structure of a bone offset (example : pelvis)
00 00 00 00	0	x-offset of bone (pelvis) with respect to parent
00 00 00 00	0	y-offset of bone (pelvis) with respect to parent
00 00 00 00	0	z-offset of bone (pelvis) with respect to parent

Skeleton

The hierarchy of the bones (parents, children, siblings) is defined in the TRIA file (linked to from the same TRCM file as the TRTA).

If the (0°, 0°, 0°) orientation is set for every bone, then all the bones point along the x axis of the character (from right to left) and face upwards.

Viewed from above, you get something like this : "o" is a pivot (yeah, the shoulders are attached to the neck), and ":)" is a smiley :)

15-o-14-o-13-o-12-o  4-o-3-o-2-o       ^ z
                  |            |       ^
           :)11-o-10-o-9-o-8-o-1  < < <^< < <
                  |            |   x   ^
19-o-18-o-17-o-16-o  7-o-6-o-5-o       ^

XYZ offsets

The xyz-offsets in the TRIA are offsets (aka "translations") of a bone relative to its parent in that system of coordinates (see above).

Thus they effectively specify the relative positions of the joints.

Pelvis

Pelvis is further translated with respect to the root bone by the height track of TRAM

The root bone is translated by TRAM as well as by the physics engine (jumps, blasts).

Maybe overlay TRAMs generate extra translations of the bones, too.

Relevant offsets

You may notice that X and Y offset for thighs and shoulders is very small (it's the left/right i.e. Z that matters there).

For all the other bones, the offset is essentially along X (i.e. along the main axis of the bone meshes). Y and Z offsets are very small.

So X/Y offsets of shoulders and thighs can basically be set to zero, as well as Y/Z offsets of all the other bones.

A skeleton is primarily defined by the Z offsets of shoulders and thighs (broad/narrow shoulders and hips), and by the X offset (effectively, the length) of all the other bones.

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Main Page >> Oni Binary Data >> File types >> TRTA