added initializePipeline()

Author: tomoreilly

src/qt-guilib/TopoDataItem.cpp

@@ -144,6 +144,9 @@ void TopoDataItem::setupAxes(vtkCubeAxesActor *axesActor,
 }
 
 
+void TopoDataItem::initializePipeline() {
+  clearAddedActors();
+}
 
 bool TopoDataItem::loadDatafile(QUrl fileUrl) {
 
@@ -154,6 +157,8 @@ bool TopoDataItem::loadDatafile(QUrl fileUrl) {
   setDataFilename(filename);
 
   pipeline_->firstRender_ = true;
+
+  initializePipeline();
 
   reassemblePipeline();
 

src/qt-guilib/TopoDataItem.h

@@ -235,6 +235,9 @@ namespace mb_system {
 
   protected:
 
+    /// Initialize pipeline structure 
+    void initializePipeline(void);
+    
     /// Assemble pipeline elements
     virtual void assemblePipeline(Pipeline *pipeline);