How to animate the particle hair size? I have made a sphere and assigned a hair particle system. I'd like to scale the hair particles in one area when higher than that of another area and would like to animate that too.
Q: How to animate the particle hair size?
I'm not exactly sure if I understand your question correctly, but you can easily animate particle scale:
In your particle settings, under &quot;Render&quot; right-click on &quot;Scale&quot; and choose insert keyframe. Alternatively, you can click on the small dot right to the box.
Then, go forward in your timeline, insert a new value for &quot;Scale&quot; and again, insert a keyframe.

This may result in something like this: