Hi, three.js developers! I made two cubes and rotated them using TransformControls to make them look the same. But their rotation is different. Why does it happen? How do I compare two rotation values? Thank you in advance.

[image] PavelBoytchev: If I had to compare two rotations, I would start with three perpendicular vectors (e.g. the unit vectors of a coordinate system). Then I will transform them by both rotations. And only after then I will compare the resulting pairs of vectors whether they are close. It o…

The most obvious reason is the symmetry – i.e. if you rotate a cube 90° around any of its local axes, … the result will look the same. If this is not the case, comparing rotations is tricky, as they are not a single number, but a set of numbers. More over, rotations have different representations: …

Here they can try it out. [image] Quaternion - Axis, Angle Visualization Resources I’ve been using quaternions. Because rotation in space is not easy, I was looking for a simple visualization. I found a lot of theory about quaternions and a workable converter. http://www…

Thank you very much for your correct answer, hofk.

How to compare 2 rotation values

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hofk February 14, 2023, 7:48pm 3

Here they can try it out.

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How to compare 2 rotation values

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