Rotation order and universal lock of unity panel

Every unity Objects have one on the panel rotation value , So how do you get the value of this rotation ？

Suppose an object xyz Of rotation Values are not zero , We will find this by pulling the value on the panel , pull y Value is the value of the object around the world coordinate y The axis rotates in the vertical direction , pull z The axis of an object along its own coordinates z Shaft rotation , pull x The axis is difficult to see the rotating axis .

If the rotationZ Value to 0, Pull again x, Find the object around its own coordinates x Shaft rotation

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For this phenomenon , We can think of it this way ,unity Get a rotating object , It's from （0,0,0） Start , Go around first y Shaft rotation , And then there was x Axis , And finally z Axis .

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What is the phenomenon of universal lock ？ It refers to pitch value , namely unity In the panel rotationX by 90 degree , Rotation will lose a degree of freedom .

Set up rotationX by 90 degree , Pull again y and z, You will find that their rotation axes coincide , In this way, it can no longer rotate freely . Increase Euler angle by code x, You will also find arrival 90 Time cannot be increased .

This problem can be prevented by substituting quaternions for Euler angles .