Index: /OpenSceneGraph/trunk/src/osgParticle/FluidFrictionOperator.cpp
===================================================================
--- /OpenSceneGraph/trunk/src/osgParticle/FluidFrictionOperator.cpp (revision 4121)
+++ /OpenSceneGraph/trunk/src/osgParticle/FluidFrictionOperator.cpp (revision 9568)
@@ -37,8 +37,12 @@
     
     osg::Vec3 Fr(-R * v.x(), -R * v.y(), -R * v.z());
-
+    
+#if 0
+    // Commenting out rotation of force vector rotation from local to world as the particle velocity itself
+    // should already be in world coords so shouldn't need rotating.
     if (_current_program->getReferenceFrame() == ModularProgram::RELATIVE_RF) {
         Fr = _current_program->rotateLocalToWorld(Fr);
     }
+#endif
 
     // correct unwanted velocity increments