transform.Rotate is returning unexpected results

Questions & Answers
1

Hello,
I have a question. I probably missing some basic knowledge, because I do not understand following scenario:

I have an object, whose rotation is [0,0,0].
Then I run following 2 commands:

	transform.Rotate(45, 45, 0);
	transform.Rotate(-40, -40, 0);

Result is rotation = [-2.268; 15.476; -27.057]
I would expect something like: [5;5;0]
Thanks

2

If you take a closer look at the documentation, you will read the following:

###Transform.Rotate

Description

Applies a rotation of eulerAngles.z degrees around the z axis, eulerAngles.x degrees around the x axis, and eulerAngles.y degrees around the y axis (in that order).

If relativeTo is not specified or set to Space.Self the rotation is applied around the transform’s local axes.

So, the applied rotations are:

  1. +45° local X axis
  2. +45° local Y axis
  3. -40° local X axis
  4. -40° local Y axis

The result can’t be (5°, 5°, 0) because the rotation are applied to the local axis in the order XYXY. However, if the rotation would have been applied in the XYYX order, you would have a final rotation of (5°, 5°, 0°)