ENH: Added API to remove all lights.

Rendering/vtkRenderer.cxx

@@ -38,7 +38,7 @@
 #include "vtkPainterPolyDataMapper.h"
 #include "vtkPolyDataPainter.h"
 
-vtkCxxRevisionMacro(vtkRenderer, "1.234");
+vtkCxxRevisionMacro(vtkRenderer, "1.235");
 
 vtkCxxSetObjectMacro(vtkRenderer, IdentPainter, vtkIdentColoredPainter);
 
@@ -765,6 +765,12 @@ void vtkRenderer::RemoveLight(vtkLight *light)
   this->Lights->RemoveItem(light);
 }
 
+// Remove all lights from the list of lights.
+void vtkRenderer::RemoveAllLights()
+{
+  this->Lights->RemoveAllItems();
+}
+
 // Add an culler to the list of cullers.
 void vtkRenderer::AddCuller(vtkCuller *culler)
 {

Rendering/vtkRenderer.h

@@ -76,6 +76,10 @@ public:
   // Remove a light from the list of lights.
   void RemoveLight(vtkLight *);
 
+  // Description:
+  // Remove all lights from the list of lights.
+  void RemoveAllLights();
+
   // Description:
   // Return the collection of lights.
   vtkLightCollection *GetLights();