Thank you both for responding.
Aron, unfortunately, the “Generate Surface Normals” filter is not available, since this is not vtkPolyData (unless there is another way to generate surface normal data?).
The case I showed in my first post is a multi-block dataset (created from opening a structured .cgns file). However, I have seen this problem with unstructured data/grids as well (see attached .vtu file).
However, I did notice that when the camera is normal to the surface, the patchiness is not present… it’s only when viewing surfaces at an angle. This makes me think Aron is on to something with the calculation of surface normals.
Mathieu, for the coincident topology settings, can you be more specific? I’ve played with some of those, but haven’t had any luck. I’ve changed the “Resolve Coincident Topology” method, and changed the “Polygon Offsent Parameters.” Is there anything else I can try?
I know this might seem minor, but there are situations where I need to zoom in to cases like these and snap screenshots to show small-scale turbulent structures, etc. So, any other help is greatly appreciated.
Also, FYI, I am running on Windows 10 with a Radeon 5700 XT with the most up-to-date drivers (version 21.2.1).
PS. You can observe the pictured effect by opening the .vtu file, tilting the camera a bit, and zooming in.
flow_300000.vtu (2.1 MB)