It was a custom build of visualizer but if your ParaView has optix available, it should be available within the UI of Visualizer like we have in ParaView.
I can choose the OptiX backend under Ray Traced Rendering in ParaView on my laptop. However, there’s no such option in Visualizer under Ray Traced Rendering with Enable Ray Tracing is on.
I am just wondering if this Enable OptiX only exists in that particular custom build.
I also try Paraview web recently, got similar question here.
When selecting Enable Ray Tracing, even there isn’t a dropdown list to select backend method like desktop version.
Visualizer of both windows and linux version have same situation.