I'm trying to use arc to align an instance object using geometry nodes. However it seems to be off.

Note: I'm trying to use the Arc Node since the angles I will be using won't be whole numbers example 45.34 to 137.54, 173.5 to 243.54, 54.3 to 99.34)

I'm trying to get something like this using geometry nodes:


But when I look at it from the top it's off (see red arrow):


Node Group:


  • $\begingroup$ Why Index < 0.8? $\endgroup$
    – quellenform
    Commented Oct 5, 2022 at 22:00
  • $\begingroup$ No reason, the threshold could be 1, I was just trying different things to see if it effected it. It deletes the extra / overlapping indexed object if threshold is set to 0. $\endgroup$
    – Rick T
    Commented Oct 5, 2022 at 22:02
  • $\begingroup$ And a circle instead of an arc would not be an alternative for you here? ...only because the angle runs from $0°$ to $360°$ $\endgroup$
    – quellenform
    Commented Oct 5, 2022 at 22:14
  • $\begingroup$ I'm using specific angles 135.4, 178.2 not really whole numbers hence using the arc. Example going from 123.34 to 137.54 $\endgroup$
    – Rick T
    Commented Oct 5, 2022 at 22:17

1 Answer 1


The problem here is that the normals of the first and last point do not point in the direction you would expect.

In contrast to all other points, these are turned slightly outwards, because no interpolation between two points takes place here.

Therefore you could simply recalculate the normals:

enter image description here

(Blender 3.2+)

  • $\begingroup$ Thanks!!! that one confused me a bit. $\endgroup$
    – Rick T
    Commented Oct 5, 2022 at 22:58

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