Fix AlphaController affecting all instances of the StateSet

components/nifosg/controller.cpp

@@ -353,6 +353,13 @@ AlphaController::AlphaController(const AlphaController &copy, const osg::CopyOp
 {
 }
 
+void AlphaController::setDefaults(osg::StateSet *stateset)
+{
+    // need to create a deep copy of StateAttributes we will modify
+    osg::Material* mat = static_cast<osg::Material*>(stateset->getAttribute(osg::StateAttribute::MATERIAL));
+    stateset->setAttribute(osg::clone(mat, osg::CopyOp::DEEP_COPY_ALL), osg::StateAttribute::ON);
+}
+
 void AlphaController::apply(osg::StateSet *stateset, osg::NodeVisitor *nv)
 {
     if (hasInput())

components/nifosg/controller.hpp

@@ -189,6 +189,8 @@ namespace NifOsg
         AlphaController();
         AlphaController(const AlphaController& copy, const osg::CopyOp& copyop);
 
+        virtual void setDefaults(osg::StateSet* stateset);
+
         virtual void apply(osg::StateSet* stateset, osg::NodeVisitor* nv);
 
         META_Object(NifOsg, AlphaController)