Curves operations:

Here I will describe all operators that are available in the bottom part of Hair Tool pie menu (Ctrl+Shift+H - by default). Or from right Sidebar in Hair Operations tab.

Note1: All these tools will work with selections made with Hair Modeling tools Note2: Quite often all hair curves are generated procedurally. This mean tools below wont work, since there are no real curves to operate on. There is option in Hair System to Bake generated Curves to real geometry

Radius Section

Radius Multiply multiply radius of selected curves by given value Set Multiply set radius of selected curves to given value Taper Curve use curve mapping to change radius of selected curves

Tilt Section

Tilt Add adds titl to existing curve tilt value Set Tilt set tilt of selected curves to given value Align Tilt Align Tilt (to Target - if set, or to curves Surface object) Randomize Tilt Randomize tilt of selected curves (between 'Max Tilt Angle', and 'Min Tilt')

Utils Section

Smooth Attribute smooth: radius, tilt or position of selected curves Hair Straighten straighten selected curves (with adjustable transition) Adjust Length set length of selected curves to given value (they can be extended above 100% too)

Curve Simplify Allows to reduce point count. Good for reducing polycount on hairs

Resample Curve Resample Curve. Allows to increase/decrease number of points each curve is made of

Parameters (F9):

  • Points per strand - How many points each spline will have after resampling
  • Offset to tip - Move spline points more toward tip
  • Offset to root - Move spline points more toward root
  • Equal point count - When disabled, shorter splines will have less points
  • Uniform Spacing - Equalize distance between points when resampling

Straighten Curve old demo from HTool 2.46 (works same way in HT 3.0 - except on new hair curves)

Interpolate Strands Generate extra strands in between selected curves

Other Section

Separate / Join Curves

Separate / Join Curves - This works in Object Mode, Curve Edit mode and Sculpt Mode

Slice Using Mesh

Slice Using Mesh - you can cut curves using mesh (same as in HTool 2.46)

Generate Ambient Occlusion

Generate AO button will add, geometry nodes based, Ambient Occlusion effect (modifier) to your object. The effect will be saved as a color attribute called AO

By default, AO attribute node is connected into 'Vert Color AO' input in HairShader

For more detailed info about AO generation, please check this YT Video (around 3 mins, at 2:30)

Select Tips/Roots

Available in Curve Edit mode at the bottom of Select menu

Select Tips/Roots - lets you select first/last points on curves. You have option to randomize selection, or limit it by strand length.

Shape Keys

Curves Shape Keys

Hair Tool comes with feature that resembles mesh Shape Keys, but for hair curves. It is targeted for new hair curves, and it creates snapshots of curve points positions. These snapshots can be loaded at any time using checkbox icon.

Location: curve 'Data' tab > 'Curves Shape Keys' panel.

Track To Curve deformer, is automatically creating bind position shapshot. With it you can bring your curve back to original (bind) shape at any time. Similar workflow is possible with built-in mesh shapekeys and Track to Mesh

Transfer Shape Keys to Mesh

Location: curve 'Data' tab > 'Curves Shape Keys' panel.

Select Mesh hair, then Curve Hair object (they have to have same topology - vert, edge, face count) and then click 'Transfer Shape Keys' to bake hair deformation into mesh shape-key