Are you referring to the second or third photo? In the second photo, it looks like you’re displaying the geometry as a wireframe rather than a surface (actor.getProperty().setRepresentation(Representation.SURFACE)).
As for setShading(true), it appears that we have ts definitions for that method but no actual setters/getters for that property. Looks like vtk.js doesn’t support toggling shading, as it should be on by default.