You can apply overall effects to the render hairs using the Frizz and Kink parameters on the Effects page of the Hair property editor.
Many of these parameters can have weight and texture maps connected to them, as identified by a little connection icon beside them. This allows you to create either specific patterns or random areas of frizz and kinks for the hair, depending on the effect you want. For general information about mappable parameters, see Connecting Maps to Render Hair Parameters.
You can make hair appear frizzy or affected by static by using the appropriately-named Frizz parameters. These parameters work by adding a rotation with noise to the hair.
Frizz Frequency is the frequency of the rotation noise pattern and is relative to the hair emitter object's size. This means that the same value produces the same number of "bends" on small objects as on large objects.
You can set the frizz along each of the X, Y, and Z axes. Select the Link XYZ axes option to change all XYZ values to the same value at once.
Frizz at root and Frizz at tip add the noisy rotation to the strand using a value in the range of 0 to 180 (or more). This value is scaled by three different harmonic noise fields, whose frequency is set by the Frizz Frequency value.
Frizz at root starts the rotation from the root and interpolates along the length of the strand to the tip, while Frizz at tip starts the rotation at the tip and interpolates along the strand to the root.
If Frizz at root is relatively high and Frizz at tip is relatively low, the effect is like using mousse to scrunch together hair at the tips while preserving the chaos at the roots.
To create effects similar to the Wiggle parameters used when the hair has dynamics applied (see Adjusting the Hair's Reaction to Dynamics), you can animate the frizz for extra hair motion. You can use this in place of the Wiggle parameters for creating certain effects, such as wavy grass.
The Kink parameters also apply noise to the hair, but in this case it's a displacement of each point along the hair strand. The effect you see is kinky or wavy hair.
Kink Frequency is the frequency of the noise pattern and is relative to the hair emitter object's size. This means that the same value produces the same number of "bends" on small objects as on large objects.
You can set the kink along each of the X, Y, and Z axes. Select the Link XYZ axes option to change all XYZ values to the same value at once.
Kink at root and Kink at tip add the noise to the strand. This value is scaled by three different harmonic noise fields, whose frequency is set by the Kink Frequency value.
Kink at root starts the noise from the root and interpolates along the length of the strand to the tip, while Kink at tip starts the noise at the tip and interpolates along the strand to the root.
