How to Add Clumping, Roughness, and Kink in Blender Hair

This guide explains how to add clumping, roughness, and kink to hair particles in Blender using the particle system's child settings. By adjusting these three core parameters, you can transform basic, uniform hair strands into realistic, natural hair with varied volume, texture, curls, and stray fibers.

1. Enable Child Particles

Clumping, roughness, and kink effects are generated through child particles rather than parent strands.

  1. Select your object and open the Particle Properties tab in the Properties editor.
  2. Scroll down to the Children panel.
  3. Switch the child mode from None to either Simple or Interpolated (Interpolated is recommended for character hair and fur).
  4. Increase the Display Amount and Render Amount to see the generated child hairs.

2. Add Clumping

Clumping groups child particles together around the parent strands, creating locks or tufts of hair.

  1. Expand the Clumping sub-panel within the Children section.
  2. Adjust the Clump slider:
    • Positive values (0.0 to 1.0): Pull the tips of child hairs toward the parent strand tip.
    • Negative values (0.0 to -1.0): Pull the roots together while leaving the tips spread out.
  3. Adjust the Shape slider to control where the clumping starts along the strand (negative values shift clumping toward the root, positive values toward the tip).
  4. Enable Use Clump Curve to manually graph and customize the clumping profile from root to tip.

3. Add Roughness

Roughness introduces noise, scatter, and randomness to prevent hair from looking unnaturally smooth.

  1. Expand the Roughness sub-panel within the Children section.
  2. Adjust the roughness parameters:
    • Uniform: Adds overall random displacement in all directions.
    • Size: Controls the scale/frequency of the uniform noise.
    • Endpoint: Increases displacement toward the tips of the hair strands, creating frayed ends.
    • Random: Randomly varies the roughness effect across different child strands.
  3. Enable Use Roughness Curve if you want to define specific regions along the strand length that receive roughness.

4. Add Kink

Kink deforms the child particles into specific procedural shapes, such as curls, waves, or braids.

  1. Expand the Kink sub-panel within the Children section.
  2. Click the dropdown menu and select a kink type:
    • Curl: Creates tight or loose helical curls.
    • Radial: Distorts strands radially around the parent.
    • Wave: Creates flat, sinusoidal wavy hair.
    • Braid: Interweaves strands into a braided pattern.
    • Spiral: Creates widening spirals.
  3. Adjust the Amplitude to control the strength and width of the curl or wave.
  4. Adjust the Frequency to set how many cycles or turns occur along the length of each strand.
  5. Adjust the Shape slider to shift the kink effect toward the tip or the root.