Hello,the ring spot must be a ring like this:
Is it possible to implement it in VTK?
I don’t think so without coding but I’d be happy to be proven wrong.
One potential path I can think of is through VTK’s OSPRay backend.
OSPRay can do it, see innerRadius parameter of the Spot/Ring Light in Intel OSPRay Documentation
But that control is not yet exposed in VTK like the radius parameter is.
https://vtk.org/doc/nightly/html/classvtkOSPRayLightNode.html