Fixed issue with disabling hand when not tracking

Author: De-Panther

Packages/webxr/CHANGELOG.md

@@ -11,7 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - OnXRChange is called from the Update loop.
 
 ### Fixed
-- User scaling issue in FullView WebGLTemplates
+- User scaling issue in FullView WebGLTemplates.
+- Issue with disabling hand when not tracking.
 
 ## [0.9.0] - 2021-04-16
 ### Added

Packages/webxr/Runtime/Plugins/WebGL/webxr.jspre

@@ -625,6 +625,7 @@ setTimeout(function () {
               frame.fillPoses(inputSource.hand, refSpace, xrHand.poses);
               frame.fillJointRadii(inputSource.hand, xrHand.radii);
             }
+            var jointsCount = 0;
             for (var j = 0; j < 25; j++) {
               xrHand.jointIndex = j*16;
               if (!isNaN(xrHand.poses[xrHand.jointIndex])) {
@@ -640,6 +641,19 @@ setTimeout(function () {
                 if (!isNaN(xrHand.radii[j])) {
                   xrHand.joints[j].radius = xrHand.radii[j];
                 }
+                // Ugly hack(?) to disable hand when not tracking
+                if (jointsCount == 0
+                    && xrHand.joints[j].position[0] == 0
+                    && xrHand.joints[j].position[1] == 0
+                    && xrHand.joints[j].position[2] == 0
+                    && xrHand.joints[j].rotation[0] == 0
+                    && xrHand.joints[j].rotation[1] == 0
+                    && xrHand.joints[j].rotation[2] == 0
+                    && xrHand.joints[j].rotation[3] == 0.5) {
+                  xrHand.enabled = 0;
+                  break;
+                }
+                jointsCount++;
               }
             }
           } else if (inputSource.gripSpace) {