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I use a group of object to render grass in a particles system set on hair.

Hair dynamics is on and seem to work well except that it has no bending over the stand I use.

They rotate along their origin but they do not bend. When I use the basic hair particles they do, so I assumed this is because my objects do not have segment that can be used for bending in the particle system but I did'nt find anything explaining what I need to do to achieve that.

I assume thats why the vortex force field is acting so stange because in my mind (and in nature) I don't think they'll do that (see video)

Here some screenshot for demonstrate

the vortex force field

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The particle system

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A view of the 3D view enter image description here

and finally a render of the effect https://youtu.be/PHE01EY38rU (sorry for the size and quality but it make foreverrrr to even do that on my computer but I think thats enough to show what I mean)

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