Calculate the angle between two edges using geometry nodes.
How can I calculate the angle between two edges using geometry nodes.
When I try and calculate it, it says 90 degrees (see red arrow which is not correct) what am I missing?
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2 Answers
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Your second Sample Index node samples an edge with index 1 — the second edge (0 being the first). But mesh line with 2 points only has 1 edge, so the output of this node is a null vector.
Changing the Sample Index to 0 will fix the issue
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I think Sergey Kritskiy has answered why your group isn't working, and adjusted accordingly.
If it helps, this is a group using the same method as yours, with a little more generality.
- Curves don't branch, and have a vertex index order imposed, so the mesh is converted for calculation.
- The minimum swept angle between incoming and outgoing edge-directions is returned on each vertex, marked positive anticlockwise, with respect to a given 'Up' viewing direction.
It takes the Arccosine of the dot-product of the normalized directions, and derives the sign of the angle from the alignment of their cross-product with 'Up'. The cross-product is 0-length at end-points, so 0° is returned for those.
