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visit-dav / visit

VisIt - Visualization and Data Analysis for Mesh-based Scientific Data
https://visit.llnl.gov
BSD 3-Clause "New" or "Revised" License
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Index Select operator should work on unstructured meshes #18422

Open JustinPrivitera opened 1 year ago

JustinPrivitera commented 1 year ago

Index Select operator should work on unstructured meshes.

Pictured is a render of my unstructured mesh. I would like to use index select on it so that instead of seeing all 1200 lines, I see fewer, so it is easier to visually parse. On the right-hand side of the image is the message VisIt displays when I attempt to do this.

Screenshot (78)

markcmiller86 commented 1 year ago

Yeah, I agree. An UNstructured mesh can be viewed as a 1D logical index space and so we should support a 1D index select on UNstructured mesh.

If we got really creative, I wonder if we could concoct an UNstructured mesh that has some 2D logical index space as well. Maybe in the case of a fully logicaly disconnected UNstructured mesh of hexahedra (for example) we could have the first dimension for the elements and the second dimension for the nodes on each element defining a 2D logical indexing of the nodes, N x 8.

All that said, does your ensemble of line meshes here form a multi-block mesh in VisIt? If so, can't you use subset controls to turn some on and off? Yes, for 1,200 objects, an interface which requires you to individually check and uncheck each item you want on and off is nowear near as workable as one that allows you to specify some sort of striding (start, stop, stride). But, maybe it helps?

JustinPrivitera commented 1 year ago

All that said, does your ensemble of line meshes here form a multi-block mesh in VisIt? If so, can't you use subset controls to turn some on and off?

This is not a multi-block mesh. I played around with subset plots and the controls there and couldn't make it draw any fewer lines.

Yes, for 1,200 objects, an interface which requires you to individually check and uncheck each item you want on and off is nowear near as workable as one that allows you to specify some sort of striding (start, stop, stride). But, maybe it helps?

I should note that this is a toy example of some of the output from the x ray image query, and my guess is that typical outputs will have probably 100x as many lines if not more.