user: How do I use Common Options in Blender? Include parameters, examples, warnings and best practices.

assistant: Child Type
:   None
    :   No children are generated.

    Simple
    :   Children are emitted from the parent position.

    Interpolated
    :   Children are emitted between the *Parent* particles on the faces of a mesh.
        They interpolate between adjacent parents. This is especially useful for fur,
        because you can achieve an even distribution.
        Some of the children can become virtual parents, which are influencing other particles nearby.

Display Amount
:   The number of children in the 3D Viewport.

Render Amount
:   The number of children to be rendered.

Length
:   Length of child paths.

Threshold
:   Amount of particles left untouched by child path length.

Seed
:   Offset in the random number table for child particles, to get a different randomized result.

### Clumping

Use Clump Curve
:   Use [Curve Widget](../../../interface/controls/templates/curve.xhtml#ui-curve-widget) instead of parameters.

Clump
:   Clumping amount along child strands.
    The children may meet at their tip (1.0) or start together at their root (-1.0).

Shape
:   Form of *Clump*. Either inverse parabolic (0.99) or exponentially (-0.99).

Twist

Use Twist Curve

#### Clump Noise

Creates random clumps around the parent hair.

Clump Noise Size
:   The size of the clumps.

### Roughness

Use Roughness Curve
:   Use [Curve Widget](../../../interface/controls/templates/curve.xhtml#ui-curve-widget) instead of parameters.

Uniform, Size
:   It is based on children location so it varies the paths in a similar way when the children are near.

Endpoint, Shape
:   “Rough End” randomizes path ends (a bit like random negative clumping).
    Shape may be varied from <1 (parabolic) to 10.0 (hyperbolic).

Random, Size, Threshold
:   It is based on a random vector so it is not the same for nearby children.
    The threshold can be specified to apply this to only a part of children.
    This is useful for creating a few stray children that will not do what others do.

### Kink

[image reference removed]

Child particles with Kink.

From left to right: Curl, Radial, Wave, Braid, Spiral.

With *Kink* you can rotate the children around the parent.
See Fig. [Child particles with Kink.](#fig-particle-child-kink) above picture for the different types of *Kink*.

Kink Type
:   Nothing
    :   Deactivated.

    Curl
    :   Children grow in a spiral around the parent hairs.

    Radial
    :   Children form around the parent a wave shape that passes through the parent hair.

    Wave
    :   Children form a wave, all in the same direction.

    Braid
    :   Children braid themselves around the parent hair.

    Spiral
    :   Generates a spiral at the end of each hair.

        Radius, Resolution
        :   Define the overall size.

        Shape
        :   Makes the spiral grow in- or outward.

Amplitude
:   The amplitude of the offset.

Clump
:   How much clump effects kink amplitude.

Flatness
:   How flat the hairs are.

Frequency
:   The frequency of the offset (1/total length). The higher the frequency the more rotations are done.

Shape
:   Where the rotation starts (offset of rotation).