boundsInto method
Bounds, in model space, of everything skin skin can draw in the pose
of nodeMatrices: its joints' positions, grown by the furthest any
vertex sits from its joint.
Implementation
void boundsInto(int skin, Float32List nodeMatrices, Aabb3 out) {
final joints = model.skins[skin].joints;
final reach = _reach[skin];
out.setEmpty();
for (var j = 0; j < joints.length; j++) {
final o = joints[j] * 16;
final x = nodeMatrices[o + 12],
y = nodeMatrices[o + 13],
z = nodeMatrices[o + 14];
final r = reach[j];
out
..addXYZ(x - r, y - r, z - r)
..addXYZ(x + r, y + r, z + r);
}
}