Only camera animation to go.

offline_ray_tracer/source/main.cpp

 #include <algorithm>
 #include <cstdint>
+#include <iostream>
 
+#include <vtkActor.h>
 #include <vtkAVIWriter.h>
 #include <vtkOSPRayPass.h>
 #include <vtkPolyDataMapper.h>
@@ -8,7 +10,7 @@
 #include <vtkRenderWindow.h>
 #include <vtkRenderWindowInteractor.h>
 #include <vtkSmartPointer.h>
-#include <vtkOSPRayVolumeMapper.h>
+#include <vtkUnstructuredGridVolumeRayCastMapper.h>
 #include <vtkVolume.h>
 #include <vtkWindowToImageFilter.h>
 
@@ -33,13 +35,13 @@ std::int32_t main(std::int32_t argc, char** argv)
 
   std::cout << "Setting up mappers, actors and volumes.\n";
   auto pd_mapper = vtkSmartPointer<vtkPolyDataMapper>                     ::New();
-  auto ug_mapper = vtkSmartPointer<vtkOSPRayVolumeMapper>::New();
+  auto ug_mapper = vtkSmartPointer<vtkUnstructuredGridVolumeRayCastMapper>::New();
   auto pd_actor  = vtkSmartPointer<vtkActor>                              ::New();
   auto ug_volume = vtkSmartPointer<vtkVolume>                             ::New();
   pd_actor ->SetMapper(pd_mapper);
   ug_volume->SetMapper(ug_mapper);
   renderer ->AddActor (pd_actor );
-  renderer ->AddVolume(ug_volume);
+  //renderer ->AddVolume(ug_volume);
 
   std::cout << "Setting up image and video writers.\n";
   auto window_to_image = vtkSmartPointer<vtkWindowToImageFilter>::New();