Remove useless method of VolumeRenderingViewer.

src/src/Rendering/Viewer/VolumeRenderingViewer.cpp

@@ -621,13 +621,3 @@ void VolumeRenderingViewer::UnActiveMeasure() {
     }
 }
 
-void VolumeRenderingViewer::PokeMeasureRender() {
-    if(!MeasureRenderer) {
-        MeasureRenderer = vtkRenderer::New();
-        if (this->RenderWindow && this->MeasureRenderer) {
-            this->RenderWindow->AddRenderer(this->MeasureRenderer);
-        }
-    }
-    this->MeasureRenderer->SetLayer(1);
-    this->Renderer->SetLayer(0);
-}

src/src/Rendering/Viewer/VolumeRenderingViewer.h

@@ -112,9 +112,6 @@ private:
     void DecreaseMaximumImageSampleDistance();
     void ResetMaximumImageSampleDistance();
 
-    void PokeMeasureRender();
-    void PokeMainRender();
-
     vtkRenderWindow *RenderWindow;
     vtkRenderer *Renderer;
     vtkRenderer *MeasureRenderer;