A "Tractor" daemon consists of a plane with four vertices representing the planes forces. The differences between the individual forces are interpolated to create the force field. In order to alter the daemon's height please change the parameters F1 – F4; if you want to change the plane use the vertical “Scale” settings under Node Params > Node.

Affect

With “Force” it takes a little time to display the daemon's full influence and the result is a curved stream of particles. “Velocity” directly affects the particles from the very beginning without any delay or acceleration, and you will get a linear particle stream. “Velocity” is not available for rigid/soft bodies.

F1 - F4

These values are used to adjust the strength values for each vertex separately. The arrows’ length is updated in the viewport according to your values and also indicate the direction of the forces. The parameters accept positive and negative settings.

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