From 7b4d3e1b11b5f66307f58502aa525ec997cef1dc Mon Sep 17 00:00:00 2001
From: Emiliana <38952746+emilianavt@users.noreply.github.com>
Date: Wed, 10 Jun 2020 20:07:40 +0200
Subject: [PATCH] This fixes various smoothness issues with the eyebrow
 tracking.

---
 Examples/OpenSeeVRMDriver.cs | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/Examples/OpenSeeVRMDriver.cs b/Examples/OpenSeeVRMDriver.cs
index 447197e..41d9443 100644
--- a/Examples/OpenSeeVRMDriver.cs
+++ b/Examples/OpenSeeVRMDriver.cs
@@ -166,6 +166,7 @@ public class OpenSeeVRMDriver : MonoBehaviour {
     private int continuedPress = -1;
     
     private VRMBlendShapeProxy lastAvatar = null;
+    private int eyebrowIsMoving = 0;
     private double lastBrows = 0f;
     private SkinnedMeshRenderer faceMesh;
     private int faceType = -1;
@@ -355,17 +356,24 @@ public class OpenSeeVRMDriver : MonoBehaviour {
             lastBrows = openSeeData.time;
             float upDownStrength = (openSeeData.features.EyebrowUpDownLeft + openSeeData.features.EyebrowUpDownRight) / 2f;
             float stabilizer = 0.3f;
+            float magnitude = Mathf.Abs(upDownStrength - lastBrowUpDown);
             float factor = 1f;
             if (openSeeData.rawEuler.y < turnLeftBoundaryAngle || openSeeData.rawEuler.y > turnRightBoundaryAngle) {
                 factor = 0.7f;
                 stabilizer *= 2;
             }
-            if (upDownStrength > stabilizer) {
+            if (upDownStrength > 0 && (eyebrowIsMoving > 0 || magnitude > stabilizer)) {
                 upDownStrength = factor * Mathf.Clamp(upDownStrength / 0.6f, 0f, 1f);
-            } else if (upDownStrength < -stabilizer / 1.5f) {
+                if (magnitude > stabilizer)
+                    eyebrowIsMoving = 5;
+            } else if (upDownStrength < 0 && (eyebrowIsMoving > 0 || magnitude > stabilizer)) {
                 upDownStrength = -factor * Mathf.Clamp(upDownStrength / -0.2f, 0f, 1f);
+                if (magnitude > stabilizer)
+                    eyebrowIsMoving = 5;
             } else
-                upDownStrength = 0f;
+                upDownStrength = lastBrowUpDown;
+            if (eyebrowIsMoving > 0)
+                eyebrowIsMoving--;
             upDownStrength = Mathf.Lerp(lastBrowUpDown, upDownStrength, 1f - eyebrowSmoothing);
             lastBrowUpDown = upDownStrength;