3.3 Geo nodes, Hair Curves. How to make the thickness have a tapered tip?

Question

I'm seeing a lot of posts with the new Hair curve, for creating hair. I found how to make thickness with geometry nodes but, I don't know how to add a profile to make the tip pointy, and tapered. Does anyone know how?

Answer 1

You can see it briefly in the official video. They use a Geometry Nodes modifier for the new Hair Curve object with a Float Curve node. It defines the thickness profile of the hair from the root to the tip.

The Map Range node is used to scale the root and tip values individually and to have them in the order, root first, then tip.

Don't forget to enter values for the group inputs in the Geometry Node modifier's settings (see screenshot on the right side). The values depend on the size of your model. For a default cube, try something like 0.03 for the root and 0.0 (or 0.01) for the tip.

Important Setting for the Viewport and Eevee

To see the thickness of the hair curves in the viewport and Eevee rendered images you need to set the Curves > Shape option to Strip. (In older Blender versions Curves is labeled as Hair)

Strand = Render curves as a thin strand roughly a pixel wide. Curve diameter parameters are ignored with this setting.

Strip = Render curves as a flat ribbon with rounded normals.

Cycles always respects the cure diameter parameters.