Fix particle systems not being rendered in their first frame

components/nifosg/nifloader.cpp

@@ -1038,11 +1038,13 @@ namespace NifOsg
                 if (!(animflags & Nif::NiNode::ParticleFlag_AutoPlay))
                 {
                     partsys->setFrozen(true);
-                    // HACK: particle system will not render in Frozen state if there was no update
+                }
+
+                // Due to odd code in the ParticleSystemUpdater, particle systems will not be updated in the first frame
+                // So do that update manually
                 osg::NodeVisitor nv;
                 partsys->update(0.0, nv);
             }
-            }
 
             // affectors must be attached *after* the emitter in the scene graph for correct update order
             // attach to same node as the ParticleSystem, we need osgParticle Operators to get the correct