Permit to disable lighting for an actor.

---

 Rendering/vtkActor.cxx                 |    1 +
 Rendering/vtkActor.h                   |    6 ++++++
 Rendering/vtkOpenGLLightingPainter.cxx |    6 ++++++
 3 files changed, 13 insertions(+), 0 deletions(-)


diff --git a/Rendering/vtkActor.cxx b/Rendering/vtkActor.cxx
index 2e508aa..63fbfd6 100644
--- a/Rendering/vtkActor.cxx
+++ b/Rendering/vtkActor.cxx
@@ -52,6 +52,7 @@ vtkActor::vtkActor()
   this->Property = NULL;
   this->BackfaceProperty = NULL;
   this->Texture = NULL;
+  this->EnableLighting = 1;
   
   // The mapper bounds are cache to know when the bounds must be recomputed
   // from the mapper bounds.
diff --git a/Rendering/vtkActor.h b/Rendering/vtkActor.h
index 48b0719..bf6a3ce 100644
--- a/Rendering/vtkActor.h
+++ b/Rendering/vtkActor.h
@@ -124,6 +124,11 @@ public:
   vtkGetObjectMacro(Mapper,vtkMapper);
 
   // Description:
+  // Enable/Disable lighting for this actor.
+  vtkSetMacro(EnableLighting,int);
+  vtkGetMacro(EnableLighting,int);
+
+  // Description:
   // Get the bounds for this Actor as (Xmin,Xmax,Ymin,Ymax,Zmin,Zmax). (The
   // method GetBounds(double bounds[6]) is available from the superclass.)
   void GetBounds(double bounds[6]) {this->vtkProp3D::GetBounds( bounds );}
@@ -169,6 +174,7 @@ protected:
 
   // is this actor opaque
   int GetIsOpaque();
+  int EnableLighting;
   
   // Bounds are cached in an actor - the MapperBounds are also cache to
   // help know when the Bounds need to be recomputed.
diff --git a/Rendering/vtkOpenGLLightingPainter.cxx b/Rendering/vtkOpenGLLightingPainter.cxx
index d80a68c..d3a04f2 100644
--- a/Rendering/vtkOpenGLLightingPainter.cxx
+++ b/Rendering/vtkOpenGLLightingPainter.cxx
@@ -136,11 +136,17 @@ void vtkOpenGLLightingPainter::RenderInternal(vtkRenderer *renderer,
       enable_flags);
     this->ProgressScaleFactor = 
       static_cast<double>(enabled_cells) / total_cells;
+    
+    if(!actor->GetEnableLighting())
+      glDisable(GL_LIGHTING);
     this->Superclass::RenderInternal(renderer, actor, enable_flags,
                                       forceCompileOnly);
 
     time_to_draw += this->DelegatePainter? 
       this->DelegatePainter->GetTimeToDraw() : 0;
+
+    if(!actor->GetEnableLighting())
+      glEnable(GL_LIGHTING);
     }
 
   this->TimeToDraw = time_to_draw;