diff --git a/panda/src/egg/eggTransform3d.cxx b/panda/src/egg/eggTransform3d.cxx
index 45f5c523c1..abc4c1adca 100644
--- a/panda/src/egg/eggTransform3d.cxx
+++ b/panda/src/egg/eggTransform3d.cxx
@@ -135,9 +135,22 @@ add_rotz(double angle) {
 ////////////////////////////////////////////////////////////////////
 void EggTransform3d::
 add_rotate(double angle, const LVector3d &axis) {
+  LVector3d normaxis = normalize(axis);
   _components.push_back(Component(CT_rotate, angle));
-  _components.back()._vector = new LVector3d(axis);
-  _transform *= LMatrix4d::rotate_mat(angle, axis);
+  _components.back()._vector = new LVector3d(normaxis);
+  _transform *= LMatrix4d::rotate_mat(angle, normaxis);
+}
+
+////////////////////////////////////////////////////////////////////
+//     Function: EggTransform3d::add_rotate
+//       Access: Public
+//  Description: Appends an arbitrary rotation to the current
+//               transform, expressed as a quaternion.  This is
+//               converted to axis-angle notation for the egg file.
+////////////////////////////////////////////////////////////////////
+void EggTransform3d::
+add_rotate(const LQuaterniond &quat) {
+  add_rotate(quat.get_angle(), quat.get_axis());
 }
 
 ////////////////////////////////////////////////////////////////////
diff --git a/panda/src/egg/eggTransform3d.h b/panda/src/egg/eggTransform3d.h
index 58e763eaeb..2dd6be7b17 100644
--- a/panda/src/egg/eggTransform3d.h
+++ b/panda/src/egg/eggTransform3d.h
@@ -44,6 +44,7 @@ public:
   void add_roty(double angle); 
   void add_rotz(double angle); 
   void add_rotate(double angle, const LVector3d &axis);
+  void add_rotate(const LQuaterniond &quat);
   void add_scale(const LVecBase3d &scale);
   void add_uniform_scale(double scale);
   void add_matrix(const LMatrix4d &mat);