How to make particles of particle flow source rotate according to the normal direction of emitter object?

[misakimiku]

I used the particle flow source to make a feather growth animation, but I didn't know how to make the feather rotate along the normal direction of the cylinder. I found that the particle flow source can only rotate as a whole. What should I do?

[Anonymous · Accepted solution]

Tutorial:

https://www.youtube.com/watch?v=upv9MRP3YKE