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Maniphest T85763

Geometry Nodes: Align rotation to vector node doesn't flip rotation when vector is multiplied by -1
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Description

System Information
Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 460.89

Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-02-18 10:11, hash: rBb166429fc9ba

Short description of error
When you add an Align Rotation to Vector Node, the rotation of the object doesn't seem to be influenced by the sign of the vector to align to. In the example images below the result is the same for all multiples of the vector (0,0,1).

The expected behaviour would be that the cones point in the opposite direction when the vector is changed to (0,0,-1) from (0,0,1). This does happen when the pivot is changed from auto to X or Y.

Exact steps for others to reproduce the error
See the blend file

Geometry-Nodes.blend664 KBDownload

Or open default blend file

  • Add a plane and a cone
  • Add a geometry nodes modifier to the plane
  • Copy the node group from the images above.

Revisions and Commits

rB Blender
D10466rB359d0029fe76 Fix T85763: Align Rotation to Vector node fails for collinear vectors