Random direction node

This modifier bends the pathlines in a random direction, randomly between the minimum and maximum angles.

Smoothing

Specifies the length at which the pathlines will bend from minimum to maximum angles. The higher the value, the smoother the curvature of the pathlines.

Random angle group

Min angle

The minimum rotation angle in random direction.

Max angle

The maximum rotation angle in random direction.

The right connectors allows to connect the Curve node to control the values of the corresponding parameters along the pathlines.

An example: