Opacity artifacts

[jack-parsons]

There's squares on the surface of the objects when opacity is applied.
@JoshuaSteer any idea why this might be?

[jack-parsons]

This seems to be the relevent issue Kitware/vtk-js#680

[jack-parsons]

This appears to be an issue with vtk.js caused by the "depth peeling implementation" not being added yet. The developers have said they don't have a time frame to support this. Kitware/vtk-js#771

[jack-parsons]

Interestingly, I add a small sphere and give it full opacity, it reduces the problem slightly

Will attempt to add a small opaque actor somewhere and see if issue is improved.