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I have a tree generated with m-tree add on, which is based on a particle system. I would like to use it as an instance in another particle system. As far as I understand, such nested particle system is only supported via geometry nodes. I would like to port my particle system settings to geometry nodes.

I have a problem with Rotation > "normal" orientation. It looks like this: desired orientation

According to the documentation it orients the particles "to emitter’s surface normal, the objects Y axis points outwards."

I tried to reproduce this setting in the geometry nodes trying different settings: geometry nodes

but I failed to find a setting which would match the particle system one. How can I reproduce the particle system setting in geometry nodes?

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I managed to reproduce the original rotation with this setting. Not sure why it's so complicated.

solution

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  • $\begingroup$ "normally" you only have to plug the rotation to the "align euler to vector" vector input and that to the rotation. so ...just one node instead of your 3 needed. $\endgroup$
    – Chris
    Jun 20, 2022 at 17:22
  • $\begingroup$ @Chris would you be able to show how you do that? It seems that particle system uses a different set of default axis (trying to make Y to match normal, as opposed to Z), which is super confusing to duplicate. The above worked for one model I used, but when I turned it around, the particle system returned in a different way from the geometry nodes ones... $\endgroup$
    – sygi
    Jun 20, 2022 at 18:58
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    $\begingroup$ [1]: i.stack.imgur.com/l3gbV.jpg $\endgroup$
    – Chris
    Jun 21, 2022 at 5:23
  • $\begingroup$ Thanks, I tried that, but I got a different rotation of the particles (which couldn't be fixed through transform) $\endgroup$
    – sygi
    Jun 21, 2022 at 18:31
  • $\begingroup$ After a more careful looking, it seems like a bug in the particle system. I guess I'll live with the geometry nodes version, thanks a lot! $\endgroup$
    – sygi
    Jun 21, 2022 at 18:49

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