From 9a11df514a2e2dfa51e126d47724533c1ae5f13f Mon Sep 17 00:00:00 2001
From: Dr Tracy Gardner <tracygardner@users.noreply.github.com>
Date: Mon, 22 Dec 2025 17:33:19 +0000
Subject: [PATCH] Handle missing rotation quaternion during rotations

---
 api/transform.js | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/api/transform.js b/api/transform.js
index 506b1261..dc252713 100644
--- a/api/transform.js
+++ b/api/transform.js
@@ -363,6 +363,19 @@ export const flockTransform = {
         flock.BABYLON.Tools.ToRadians(x),
         flock.BABYLON.Tools.ToRadians(z),
       );
+
+      if (!mesh.rotationQuaternion) {
+        const {
+          x: currentX = 0,
+          y: currentY = 0,
+          z: currentZ = 0,
+        } = mesh.rotation || {};
+        mesh.rotationQuaternion = flock.BABYLON.Quaternion.FromEulerAngles(
+          currentX,
+          currentY,
+          currentZ,
+        );
+      }
       mesh.rotationQuaternion.multiplyInPlace(incrementalRotation).normalize();
 
       if (mesh.physics) {