Polygon vs Mesh

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I wonder what is the difference between these two?
If I create a group range node, set grouptype to primitive, set filter select 1 of 2.
Polygon will be able to select every other primitive, but if you set the Tube's type to mesh, all primitive will be selected.
I tried to check the documentation, but don't think I am very good understanding it. So can anyone explain? Thanks!

So this is the result for mesh:





This one is for polygon:
Edited by ophie - Aug. 24, 2020 11:31:35

Attachments:
polygon.PNG (462.2 KB)
mesh.PNG (494.0 KB)

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A mesh is more like a nurb surface with linear interpolation between points. If you look at the polygon numbers with a cylinder set to “mesh” rather than “polygon”, you will see that the sides all have the same number.
Edited by Island - Aug. 24, 2020 12:53:19

Attachments:
HoudiniMesh.png (282.5 KB)

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