Disable FreezeOnCull for effect particles

apps/openmw/mwrender/animation.cpp

@@ -10,6 +10,8 @@
 #include <osg/MatrixTransform>
 #include <osg/Geode>
 
+#include <osgParticle/ParticleSystem>
+
 #include <components/nifosg/nifloader.hpp>
 
 #include <components/resource/resourcesystem.hpp>
@@ -1067,6 +1069,25 @@ namespace MWRender
         attachTo->addChild(lightSource);
     }
 
+    class DisableFreezeOnCullVisitor : public osg::NodeVisitor
+    {
+    public:
+        DisableFreezeOnCullVisitor()
+            : osg::NodeVisitor(TRAVERSE_ALL_CHILDREN)
+        {
+        }
+
+        virtual void apply(osg::Geode &geode)
+        {
+            for (unsigned int i=0; i<geode.getNumDrawables(); ++i)
+            {
+                osg::Drawable* drw = geode.getDrawable(i);
+                if (osgParticle::ParticleSystem* partsys = dynamic_cast<osgParticle::ParticleSystem*>(drw))
+                    partsys->setFreezeOnCull(false);
+            }
+        }
+    };
+
     void Animation::addEffect (const std::string& model, int effectId, bool loop, const std::string& bonename, std::string texture)
     {
         if (!mObjectRoot.get())
@@ -1099,6 +1120,10 @@ namespace MWRender
         SceneUtil::FindMaxControllerLengthVisitor findMaxLengthVisitor;
         node->accept(findMaxLengthVisitor);
 
+        // FreezeOnCull doesn't work so well with effect particles, that tend to have moving emitters
+        DisableFreezeOnCullVisitor disableFreezeOnCullVisitor;
+        node->accept(disableFreezeOnCullVisitor);
+
         params.mMaxControllerLength = findMaxLengthVisitor.getMaxLength();
 
         node->setNodeMask(Mask_Effect);