ospray backend from vtk python

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1

Hello, is possible use the ospray backend from vtk python? If yes can you explain or point to some example?
Thanks
Reynaldo

2

Hello,
You can use vtkOSPRayPass.
Here is a C++ example but it should work with python:

vtkNew<vtkOSPRayPass> osprayP;

vtkNew<vtkCameraPass> cameraP;
cameraP->SetDelegatePass(osprayP);
renderer->SetPass(cameraP);

vtkOSPRayRendererNode::SetRendererType("pathtracer", renderer); // change this to use OSPRay scvis backend or VisRTX
vtkOSPRayRendererNode::SetSamplesPerPixel(this->Options->Samples, renderer); // number of samples per pixel
vtkOSPRayRendererNode::SetEnableDenoiser(this->Options->Denoise, renderer); // if you want the denoiser
1 Like
3

Hi Michael, thanks. I have achieved to run with python with the next script but when run only use one thread. Do you know how to set for use more/all available?

filename = sys.argv[1]
useOspray=len(sys.argv)>2

importer = vtk.vtkOBJImporter()
importer.SetFileName(filename + '.obj')
importer.SetFileNameMTL(filename + '.mtl')

renderer = vtk.vtkRenderer()

if(useOspray):
    print("Using ospray")
    osprayPass= vtkOSPRayPass()
    renderer.SetPass(osprayPass)

    osprayNode=vtkOSPRayRendererNode()
    osprayNode.SetSamplesPerPixel(4,renderer)
    osprayNode.SetAmbientSamples(4,renderer)
    osprayNode.SetMaxFrames(4, renderer)
else:
    print("Using opengl")


renWin = vtk.vtkRenderWindow()
renWin.AddRenderer(renderer)
importer.SetRenderWindow(renWin)
importer.Update()

# Create a renderwindowinteractor
iren = vtk.vtkRenderWindowInteractor()
iren.SetRenderWindow(renWin)

actors = renderer.GetActors()
actors.InitTraversal()

print('Number of items:',actors.GetNumberOfItems())
for i in range(actors.GetNumberOfItems()):
    actor = actors.GetNextActor()
    if actor.GetTexture():
        actor.GetTexture().InterpolateOn()

    pd = actor.GetMapper().GetInput()
    mapper = actor.GetMapper()
    mapper.SetInputData(pd)

# Enable user interface interactor
iren.Initialize()
renWin.Render()
iren.Start()
4

You may want to set OSPRAY_THREADS environment variable.

5

Already tried this but only use one core anyway.
Thanks