Incorrect parameter mapping for htcHMD（ex.ViveFocusVision） facial expressions

[AzumiYura]

The parameter mapping for htcHMD seems to be incorrect.

• MouthApeShape is intended to represent a jaw opening motion with closed lips.
• MouthUpperUpRight/Left and MouthLowerDownRight/Left are supposed to raise/lower the lips in a way that shows the teeth.

Please revise the parameter assignments accordingly.

---

ALVRModule > HtcFaceTracking.cs > SetLipHtcParams.cs

--->×
w[U.JawOpen] = p[JawOpen] + p[MouthApeShape];

w[MouthUpperUpRight] = p[MouthUpperRight] - p[MouthUpperOverturn];
w[MouthUpperUpLeft] = p[MouthUpperLeft] - p[MouthUpperOverturn];

w[MouthLowerDownLeft] = p[MouthLowerLeft] - p[MouthLowerOverturn];
w[MouthLowerDownRight] = p[MouthLowerRight] - p[MouthLowerOverturn];

--->○
w[U.JawOpen] = p[JawOpen];

w[MouthUpperUpRight] = p[MouthUpperUpright];
w[MouthUpperUpLeft] = p[MouthUpperUpleft];

w[MouthLowerDownLeft] = p[MouthLowerDownleft];
w[MouthLowerDownRight] = p[MouthLowerDownlRight];

---

After making these adjustments in VRChat, I confirmed that the avatar's mouth movements now behave correctly.

[zmerp]

Thanks. I've originally used the official SRanipal VRCFT as example for the mapping. You can submit a PR with these changes and after merging I will make a new release

[AzumiYura]

OK, Thanks！I've created the PR.

[JHawkley]

I may have just come across this issue myself and was preparing to open an issue for it; I suppose I'll want to try out the associated PR. Regardless, I'll add the screenshots I created to explain the problem to this issue, in case they might be helpful.

Specifically, when performing MouthLeft/Right, it seems to also trigger MouthUpperUpLeft/Right at the same time, creating this unpleasant crumpling and folding-up of the lips.

Below is the expected result, captured using Vive Hub and its VRCFT module:

And this is the problematic result, using ALVR and its VRCFT module: