Anari: Fix the smart volume mapper test

Rendering/ANARI/Testing/Cxx/TestAnariSmartVolumeMapper.cxx

@@ -4,6 +4,8 @@
 // This test volume renders a synthetic dataset with unsigned char values,
 // with the composite method.
 
+#include <vtkAnariPass.h>
+#include <vtkAnariRendererNode.h>
 #include <vtkCamera.h>
 #include <vtkClipPolyData.h>
 #include <vtkColorTransferFunction.h>
@@ -99,9 +101,19 @@ int TestAnariSmartVolumeMapper(int argc, char* argv[])
   volume->SetMapper(volumeMapper);
   volume->SetProperty(volumeProperty);
 
+  vtkNew<vtkAnariPass> anariPass;
+  ren->SetPass(anariPass);
+  vtkAnariRendererNode::SetLibraryName("environment", ren);
+  vtkAnariRendererNode::SetSamplesPerPixel(6, ren);
+  vtkAnariRendererNode::SetLightFalloff(.5, ren);
+  vtkAnariRendererNode::SetUseDenoiser(1, ren);
+  vtkAnariRendererNode::SetCompositeOnGL(1, ren);
+
   ren->AddViewProp(volume);
   ren->AddActor(dssActor);
-  renWin->Render();
+  ren->ResetCamera();
+
+  ren->GetActiveCamera()->Pitch(-40);
   ren->ResetCamera();
 
   iren->Initialize();

Rendering/ANARI/Testing/Data/Baseline/TestAnariSmartVolumeMapper.png.sha512

-fdb7f4250cff01b86e4a1cac8ed0ae02a771248c815b0b4d63ec598f46f7cb4c2d4a4af1647a76b0a4dd8694ea8686ad46f9012d932042277db1625cbcf0596a
+9fcf074c4deb43a566006c26ab3e5d12cb1f4bc635da4f2921514e98e199ad12f7df4aa6ca3a623b71a184818da29e2d8c5ab3716b98fd3c7773976499d73a86

Rendering/ANARI/Testing/Data/Baseline/TestAnariSmartVolumeMapper_1.png.sha512

+145c654b6c0855b298b3d1c14291bf58a5e570529ac9d32d2b86ff04909d52d4746dcd29dabf58b05505870dd0276e9b7a88a922d8c47d65741f8b4505d8f533