...
Yeah, having the curves become flat over the surface when aggressively combing is a issue. Something like this tool sounds like a good solution. Although I doubt there is time to get it into version 1...
It are a suggestion only, not a requirement.
I will give another suggestion, a rotate tool. Every hair guide starts from a vertex, every vertex has a normal. Using this normal as an axe, the rotate tool would rotate the full guide around this axe. It would be perfect the slight changes on the orientation of long hair guides. Otherwise the only way is to brush it, destroying any previous fine-tuning.
You have a great product in your hands. The attached figure is the result of only 20 minutes of work ( I have a clock over my desk), it's really easy and intuitive. There are 3 layers, one for the scalp, one for the top hair and the 3rd is a copy of the 2nd, less dense, another seed, a few tweaks using attract and curl tools, to provided a 'shredded' look. A nice youth mix of a tight tape and pompadour haircuts. But it is a scratch only. Starting from this point the tools that i suggested are very important. I want to change the orientation of the temple“s hair , so I use a rotate tool. I want to give more volume to the rear part of the top, so I use the puff roots tools. I can try several options of orientation and curl, up to a satisfactory result. We must use brush to determine the general shape of hair and other parametric tools to fine-tuning it, looking for the better aspect. This is practical/intuitive/productive.
There is no 3DSMax plugin with this easy workflow, very impressive. The 3DSMax native hair modifier is very powerful, but it requires a lot of practice to maintain it in control, very wild...


