Quaternions are initialized with the real part being zero

Unity: Mecanim Animation

As Designed

2023.1.X

2022.2.X

2022.1.X

2021.3.X

2020.3.X

This is by design in c# that fields in a struct are always zeroed by default. Thus, the quaternion will be (0,0,0,0) when the new struct is constructed an that is intended by the c# standard. If you want to set default values to your quaternion, I recommend you add a `Reset` function to your MonoBehaviour. This is called whenever the component is created in the editor, or when manually clicking reset on the component sub-menu: https://docs.unity3d.com/ScriptReference/MonoBehaviour.Reset.html

Reproduction steps:

Open the “PoseTest” project
Open the “SampleScene” scene
Press the Play button
Observe the Console

Expected result: “(0.00000, 0.00000, 0.00000, 1.00000)” is printed in the Console
Actual result: “(0.00000, 0.00000, 0.00000, 0.00000)” is printed in the Console

Reproducible with: 2020.3.39f1, 2021.3.9f1, 2022.1.14f1, 2022.2.0b6, 2023.1.0a8

Reproduced on: Windows 10

Note: one of the workarounds for the issue would be to set one of the rotation values in the Inspector and save the scene. This way the “W” parameter will be 1. It is also believed that 0,0,0,0 quaternion rotation is impossible or an invalid/undefined rotation.

Quaternions are initialized with the real part being zero

Unity: Mecanim Animation

As Designed

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Quaternions are initialized with the real part being zero

Unity: Mecanim Animation

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As Designed

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Have a workaround or additional info about this issue?