Improve Half-Body Avatar IK

[Chylum]

Is your feature request related to a problem?

Most VR players don't have full-body tracking!

I have added video snippets to show different types of movement and how they look currently in Basis.

Below these, I have also added video snippets of the what a very good IK system looks/feels like (including again the different types of movement to help compare):

The current half-body avatar IK solution looks like this:

• Sideways movement

IK.Movement.Horizontal._B.mp4

• Moving forward and back

IK.Movement.Forward.and.Back._B.mp4

• Going up and down

IK.Movement.Vertical._B.mp4

• Jumping

IK.Movement.Jumping._B.mp4

• Fingers Aligning with Controller Buttons

IK.Movement.Fingers.Align.with.Controller.Buttons._B.mp4

• Moving arms around and behind the back

IK.Movement.Arms.Behind.Back._B.mp4

• Arm Rotations

IK.Movement.Arm.Rotations._B.mp4

• Arm and hands - Clipping and Constraint

IK.Movement.Hands.Cut.Through.the.Body._B.mp4

• Rolling arms

IK.Movement.Hands.Roll.Arms.Fold._B.mp4

• Horizontal dips

IK.Movement.Horizontal.Dips._B.mp4

• Arms behind back

IK.Movement.Arms.Behind.Back._B.mp4

• Seated movement

IK.Movement.Sitting-Crouching.Same.Thing._B.mp4

• Skin Touch

IK.Movement.Skin.Touch._B.mp4

• Hands on head, shoulder, chest, stomach, and hip

IK.Movement.Hands.Placed.on.Head.Shoulders.Chest.Stomach.and.Hips._B.mp4

• Hand Tracking

IK.Movement.Hands._B.mp4

• Finger Movement

IK.Movement.Fingers._B.mp4

Describe your preferred solution

I don't know. What makes an avatar IK feel good, as seen here?

• Sideways movement

IK.Movement.Horizontal.mp4

• Moving forward and back

IK.Movement.Forward.and.Back.mp4

• Going up and down

IK.Movement.Vertical.mp4

• Jumping

IK.Movement.Jumping.mp4

• Fingers Aligning with Controller Buttons

IK.Movement.Fingers.Align.with.Controller.Buttons.mp4

• Moving arms around and behind the back

IK.Movement.Arms.Behind.Back.mp4

• Arm Rotations

IK.Movement.Arm.Rotations.mp4

• Arm and hands - Clipping and Constraint

IK.Movement.Hands.Don.t.Cut.Through.the.Body.mp4

• Rolling arms

IK.Movement.Hands.Roll.Arms.Fold.mp4

• Horizontal dips

IK.Movement.Horizontal.Dips.mp4

• Arms behind back

IK.Movement.Arms.Behind.Back.mp4

• Seated movement

IK.Movement.Sitting.mp4

• Crouched movement

IK.Movement.Crouching.mp4

• Skin Touch

IK.Movement.Skin.Touch.mp4

• Hands on head, shoulder, chest, stomach, and hip

IK.Movement.Hands.Placed.on.Head.Shoulders.Chest.Stomach.and.Hips.mp4

• Hand Tracking

IK.Movement.Hands.mp4

• Finger Movement

IK.Movement.Fingers.mp4

(btw: at some points in a few videos, the main part starts mid-way - I just couldn't be bothered redoing the recording since preparing these took most of the day!)

Describe any considered alternatives

N/A

Additional Context

No response

[Chylum]

Going to update this comment.

To do:

• Identify and explicitly label what's limited rn with the current IK system
• Analyse the different elements that make a very good IK system based on the videos

[SketchFoxsky]

It would probably help if we change all the math to reference the player up direction instead of world up, that way if the player ever gets rotated by a chair or any other methods the IK doesn't explode trying to solve it

[dooly123]

we should handle of all those the up vectors are a bit more special i believe

[dooly123]

thanks for taking the time with the shots. this stuff is hard as we all know :)

[SketchFoxsky]

just published my branch with the changes i been working on the past 2 days!