Radial direction node

Performs the radial curling of the direction.

Smoothing

Specifies the length at which the direction will be rotated by the Angle bend value.

Angle bend

Specifies the angle bend on Smoothing length.

Orientation

Specifies the orientation angle in which direction the pathlines will be curved.

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

An example: