How to control length of hair density brush?

I’m trying to change the density of some hair I’ve placed on my model, but there seems to be no way to control the length. Can I make the added hairs the same length as the existing hairs?

You can set it to interpolate, or a fixed length if you happen to know the length of the existing ones -

hair15

That’s not the density brush you’re using - that’s the add brush. I want to use the density brush to target a particular density, not just add more hairs.

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Ah, right. Well ye, density brush doesn’t have that setting as you pointed out, but you could use the interpolate node and mask a given density to any area required -

hair16

I don’t know of any destructive way about this unfortunately.