Why does the “Density” setting for texture controled hair growth only work with “Children Hairs” in Blender 2.90?

[Kent Trammell]

@duerer WOW I just finished reading your master’s thesis on this issue! That’s some serious troubleshooting. @spikeyxxx-level troubleshooting in fact. Perhaps this is worth reporting as a Blender bug?

You two are a great example of people willing to figure out precisely why / how something works. People like you are the reason why Blender gets better every week.

Meanwhile I will try a few times and move on to something else if I can’t make it do what I want. People like me are NOT the reason Blender gets better every week 😅

[Ingmar Franz]

Thanks @theluthier 🙂! It’s propably not a bug but simply how Blender is programmed. 

I have a theory: 

As soon as you edit the hairs in “Particle Edit Mode”, the “Particle System Simulation” no longer controls the hairs and therefore the simulation settings are greyed out in the “Particle Properties Tab”. But the “Children” settings are still accessible since they are an aesthetic addition.

By activating “Children Hairs”, Blender is forced to revisit the “Particle System Settings” in the “Non-Simulation Section” and with it the “Hair Density Texture”. Since the “Particle Edit Mode” now fully controls the hairs, those hairs in 100% black painted areas aren’t removed but just hidden in order to leave the removal of hairs to the  “Particle Edit Mode” which offers the “Cut Brush” for this task.

[bkol]

Wow, again, thank you, Duerer! This is immensely helpful!

[Author]

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