Setup unity skeletons for inverse kinematics about opents2 HOT 8 OPEN

Getting close now, I added a little animation viewer to the SimsAnimationTest scene. A lot of stuff plays properly but the head look-at IK and spine position still need work.

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Animations for sims work too, but without the IK they look a little whacky. Notice how straight the arms are here:

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As of becb981 we now have good foot IK. The boxes are supposed to be the goal-IK positions from the animation

and

The arm IK still needs work, it seems to be a little more complicated. They appear to use a 1 float channel, this is the IkWeight portion of the IKTarget that controls how much weight the IK has.

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Arm IK seems to be working now! Turns out l_handcontrol0 and r_handcontrol0 were parented to the root_trans of the skeleton in the scenegraph despite being animated in absolute positions...

We still have to handle IkWeight to handle arms properly in some animations.

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even with the wonky rotations this is still insanely impressive. can definitely see some of that wonkiness in the arms and legs there but overall it's really coming together

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The next issue seems to be related to the headingOffset parameter. Some animations like a2o-exerciseMachine-benchPress-start_anim have really weird looking data.

For reference this is the original animation in game:

This is what it looks like in unity if we just use the raw data:

The way to make it look kinda normal is to set the root_rot's z rotation values zero and add 89.95 to the x rotation values. The heading offset for the clip is -1.570 radians, which is -89.95 degrees.

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Welp that was a stupid bug. Turns out the order of rotations when converting from euler rotations in sims2 is different from unity. Now a lot more animations play properly with 380b83a

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Just documenting this here but LazyDuchess pointed out that face blends seem to also be working, they're just hard to see without any texture:

Next up is head look-at IK and then all this code should be moved to an animation controller so different animations can be blended but this is basically done.

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