When you go into a particle setting and check Children -> Roughness -> Use Roughness Curve, you get the curve widget instead of roughness parameters:

Roughness Curve

In fact, that's pretty much all Blender's manual says about this feature:


How does the Roughness Curve work? I've experimented a bit with the curve but am not seeing any obvious relationship between the curve and what I see on the rendered viewport.

  • $\begingroup$ This is a good question. If you play with the hair children Length parameter with a high curve vs a low curve the result is interesting and perhaps somewhat informative. $\endgroup$ – Allen Simpson Dec 29 '20 at 0:56

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