[vtk-developers] Lighting and vtkCubeAxesActor

[Leif Delgass]

Hello,

I am trying to use the vtkCubeAxesActor from VTK git head and have run
into a problem with lighting.

If I set the ambient light in my vtkRenderer down to, e.g.
(.2,.2,.2), the label text in vtkCubeAxesActor turns dim because it
has ambient set to 1 and diffuse set to 0 in the label actors'
properties:

vtkAxisActor::SetLabels @ 1248

      this->LabelActors[i]->GetProperty()->SetAmbient(1.);
      this->LabelActors[i]->GetProperty()->SetDiffuse(0.);

I want the axes always fully lit, so In my application I have turned
off lighting on the cube axes actor property, which is copied to the
title actors, but not the label actors.  I am currently using this
change in vtkAxisActor.cxx:

diff --git a/Rendering/Annotation/vtkAxisActor.cxx
b/Rendering/Annotation/vtkAxisActor.cxx
index 01101a5..ea9d186 100644
--- a/Rendering/Annotation/vtkAxisActor.cxx
+++ b/Rendering/Annotation/vtkAxisActor.cxx
@@ -682,6 +682,7 @@ vtkAxisActor::BuildLabels(vtkViewport *viewport, bool force)
   for (int i = 0; i < this->NumberOfLabelsBuilt; i++)
     {
     this->LabelActors[i]->SetCamera(this->Camera);
+    this->LabelActors[i]->SetProperty(this->GetProperty());
     this->LabelActors[i]->GetProperty()->SetColor(this->LabelTextProperty->GetColor());
     this->LabelActors[i]->SetOrientation(0., 0.,
this->LabelTextProperty->GetOrientation());

Does this look like an appropriate fix?  Also, what was the reason for
turning off diffuse lighting on labels (but not title text)?

Thanks,

Leif Delgass