Quaternions made with Quaternion(arc_from: Vector3, arc_to: Vector3) with an angle under 0.0045 radians will not do anything

[Xorblax]

Tested versions

Tested in 4.4.beta3

System information

Godot v4.4.beta3 - Windows 10 (build 19045) - Multi-window, 2 monitors - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3080 (NVIDIA; 32.0.15.6636) - AMD Ryzen 5 3600 6-Core Processor (12 threads)

Issue description

When creating a Quaternion with the (arc_from, arc_to) constructor, if the angle is less than what seems to be around 0.0045 radians, the resulting rotation won't do anything.

Steps to reproduce

Make a Quaternion using the (arc_from, arc_to) constructor, where the angle between the vectors is less than 0.0045 radians and try to rotate something with it.

Minimal reproduction project (MRP)

quaternion-issue.zip

[matheusmdx]

Seems to be a regression between 4.4 beta 1 and 4.4 beta 2, bisecting.

[AThousandShips]

Sounds like it comes from:

• Fix Quaternion arc constructor to check dot & Add test for same Vector3s #101797

[matheusmdx]

Indeed, reverting pr #101797 fixes the issue.

CC @TokageItLab

[TokageItLab]

This case depends on the error tolerance. A possible solution is to reduce the epsilon value as in #102144.