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Particle Mesh Question

Hi, i have a quick question about particle meshes. I've read the Valve workshop section on them and Vermilion Wlad's guide but this is something not covered by that. My question is how it determines what order the vertices are in when it compiles. Usually this doesn't matter because most weapons that use a particle mesh use render animated sprites, but some weapons use render rope, which draws the particle texture in a continuous line between each vertex in order. For the life of me though i can't figure out how it determines which order the vertices are in.

Here is an example from Skywrath mage's default weapon.
rLrOiU4.jpg

And here is an example of an attempt using the create polygon tool.
x31vBFP.jpg

As you can see, rather than connecting the vertices in the order they were created, the vertices have been joined in a seemingly random order, creating a big mess rather than a neat T shape as intended.

Does anyone have any insight in how the workshop compiles the fbx model to create the psf?
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