From 6c8216bf5b097cb483f87b9f71203b8c2767c4d1 Mon Sep 17 00:00:00 2001
From: Emmett Lalish <elalish@google.com>
Date: Fri, 21 Apr 2023 15:25:53 -0700
Subject: [PATCH] robustify pointing (#4238)

* robustify pointing

* typo
---
 .../model-viewer/src/three-components/SmoothControls.ts     | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/packages/model-viewer/src/three-components/SmoothControls.ts b/packages/model-viewer/src/three-components/SmoothControls.ts
index 44d4a27c95..b15d75611c 100644
--- a/packages/model-viewer/src/three-components/SmoothControls.ts
+++ b/packages/model-viewer/src/three-components/SmoothControls.ts
@@ -711,6 +711,12 @@ export class SmoothControls extends EventDispatcher {
       return;
     }
 
+    // In case no one gave us a pointerup or pointercancel event.
+    if (event.pointerType === 'mouse' && event.buttons === 0) {
+      this.onPointerUp(event);
+      return;
+    }
+
     const numTouches = this.pointers.length;
     const dx = (event.clientX - pointer.clientX) / numTouches;
     const dy = (event.clientY - pointer.clientY) / numTouches;