As I indicated earlier, in my case the problem was not with my hair density. It did not matter what I put in the Density box, the number in parentheses stayed at 0, and clicking Show Populated on or off did nothing at all.

I started over and got hair to render properly. I still think it was a glitch somewhere in my grouping process, although I'm not entirely sure what I did wrong.

Thicker hair is always possible... and less realistic. For my settings, I'm going down to about .12 at the tip and .3 at the root. Looks a lot more believable.

Am going to have to start a thread about specular colour for hair at some point.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3