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I'm diving into geometry nodes today and I have a problem aligning the bottom of my object to Z=0.

I've learned that to achieve this you have to add a [divide node] and [combine node]. You take the total height, then divide it by 2 and with the combine node you can select just the Z axis. The object bottom should align to Z=0 but somehow it wont and the aligning just looks off. At least it wont take half of the object height.

I've tried it both with a Mesh Primitive and without (so just the normal cube in the viewport). Any idea what I might be missing? I've looked everywhere but sadly cant find anything yet since geometry nodes is still a rather new concept in blender.

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  • $\begingroup$ You need to use a Vector Math instead of regular Math for dividing. You can use a single node set to divide by (0, 0, 2) that will output a vector with only a 2 component. Using a scalar Math node will average the input values along each coordinate which you don't want $\endgroup$
    – Gorgious
    Commented Nov 30, 2021 at 8:14

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use this node setup: (thanks to Robin)

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  • $\begingroup$ I think your arithmetic is upside-down: imgur.com/a/MVInRin $\endgroup$
    – Robin Betts ♦
    Commented Nov 30, 2021 at 15:36
  • $\begingroup$ Everything else, just about :D. It only works with the default cube (or other objects, on creation) because the origin is halfway up the mesh. Shift the defaut cube in Edit Mode, to see what I mean.. $\endgroup$
    – Robin Betts ♦
    Commented Nov 30, 2021 at 15:46
  • $\begingroup$ you are right - i updated my answer, thank you Robin. $\endgroup$
    – Chris
    Commented Nov 30, 2021 at 16:09
  • $\begingroup$ Phew! I just updated that link to try to explain what I meant.. I'm not very good at expressing these things except in jumbly ways :) I already prematurely +1'd :) $\endgroup$
    – Robin Betts ♦
    Commented Nov 30, 2021 at 16:39
  • $\begingroup$ Thank you that did it. $\endgroup$
    – JeeperCreeper
    Commented Dec 1, 2021 at 23:07

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