Why is tetramesh painfully slow?

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Pelajar UM
Pelajar UM on 25 Apr 2022
Commented: Pelajar UM on 25 Apr 2022
I have a tetrahedral mesh with 35000+ vertices and 60,000+ faces. When I use tetramesh to plot it, it takes like 10 minutes.
If I use freeboundary to exctract that triangular mesh of the surface, and use trisurf, it is extremely fast, like less than a second. Of course number of data is reduced maybe by half but I don't think this is the resason.
Because if I use pdeplot3d to plot the tetrahedral mesh, similarly, it is super-fast. Less than a second also.
It seems like tetramesh is just so slow. Why?
I can't use pdeplot3d because it only accepts nodel data for its colormap. I need to use the faces for the colormap data.
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Bruno Luong
Bruno Luong on 25 Apr 2022
Edited: Bruno Luong on 25 Apr 2022
I know well what the convex hull is, My data are random volume not a specific geometry. Does the convex volume matter for the slownest you want to point out? Yes or no?
Pelajar UM
Pelajar UM on 25 Apr 2022
No, it doesn't matter. tetramesh (DT) and tetramesh(elements, nodes) are both super slow.
I have attached a list of nodes and elements that you can try. Time tetramesh vs pdemesh3d. You will see the difference is massive.

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