I rather try to explain what I want to achieve.

The cubes (later smaller objects) on the conveyor belt are supposed to be affected by the nozzles at the end and be separated depending on their weight later on. enter image description here How can I make the force field so "thin" so that the force is only applied once the cube reaches the "line of fire" (orange)?

I tried to scale down the y-scale to 0 and set some maximum radial and maximum falloff, but my cube keeps moving in the same direction above the edge now, like the conveyor belt is endless. Furthermore, if the cube is outside the outer force field sphere lines, then it cannot even enter it. I thought the maximum falloff is limiting its size, but apparently it doesn't.

enter image description here

Here are my force field settings which is seen in the previous picture:

enter image description here

  • $\begingroup$ what about some arrows or a sketch about what you want to have? Instead of a "thin" force field i would try to use drivers with forcefields so that the force only is > 0 if your cube reaches a certain coordinate... $\endgroup$
    – Chris
    Commented Jan 6, 2022 at 15:46
  • $\begingroup$ Add a screenshot of falloff settings. $\endgroup$
    – Crantisz
    Commented Jan 6, 2022 at 16:31
  • $\begingroup$ @Chris Yeah, I was also thinking about to script that. Is this what you mean with drivers? I can't find anything related to that term and I've never done scripting in Blender before. $\endgroup$
    – BR14Nx
    Commented Jan 9, 2022 at 13:50

1 Answer 1


I noticed that force fields only affect objects whose origins are inside the force fields shape. Sadly Blender doesn't check if an object has crossed a force field between two frames. So a force field plane would not work, since it is practically impossible to have a origin of a moving rigid body perfectly alligned with a plane.


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