enter image description here

Case 0. Image above. Here is a use case that appears to function. A single small plane [settings shape] [surface] and has a force with [falloff] [cone] and with [Z Direction] [+Z] . The particles are generated on a open cylinder and a projected cone shape has moved particles from the top of the cylinder toward the force. There is only an open area on the top of the cylinder.

Optional reading below ...

The image above is a better test. The image below may be replaced in the future. In the image below I used a Ico Sphere which has many faces with geometric normals facing in many balanced directions. The Z direction appears to be relevant per face of the mesh

Is it true each face of the surface is used to calculate force?

This is regarding the Z direction in the Physics Panel. enter image description here

In the image below are three cases for the falloff cone shape.

  1. Case 1 +Z. Movements in both sides of particles are seen. All faces generate part of the total force.
  2. Case 2 -Z. Movement of particles are not seen. Are forces cancelling?
  3. Case 3 Both Z. Two sided movement of particles is seen and this seems consistent.


Version : Blender 3.2

The above image is composed of different bakes of particles with different settings. All physics have Type:Force Shape:Surface Falloff:Cone. The particle system has two faces which appear above and below the force in the Z direction.



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