drops slide on surface

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hello everyone
I'm trying to do particle slide on a sphere surface just like the rain drops. I use creep pop to do that, but drops will stop in middle of this sphere and don't move anymore.

I didn't found the reason and hope some help, please.
thank you.

Attachments:
creep_test.hipnc (70.4 KB)
creep.jpg (57.1 KB)

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add infomation:
I just noticed increase Oversampling and result will be batter. but is not perfect ( still stop on somewhere )
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That's because the v values stop around 0.5. I think that has to do with Collision POP not being able to slide the particle further along the surface.

You could probably modify the UV values yourself using velocity for hit particles, which in turn would allow the Creep POP to traverse the whole sphere.
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sorry, I don't understand what is using velocity, could I ask more detail information?
I just want to let those particles sliding and don't fly out from surface (but affected by force like gravity or noise)
thank you!
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You can simply use attractor POP to stick and slide particles on the sphere

Attachments:
JKCreep.hipnc (71.0 KB)

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