how to rotate an object relative to another

Questions & Answers
1

sorry for english, I use google translator.
how do I rotate object “b” when I rotate object “a” so that it would be child of “a”? the result in the photo at the bottom left (without making the object “b” a child of “a”)

155024-asdasdasd.png
155024-asdasdasd.png1160×646 151 KB

2

@sailbov, Multiplying Quaternions has the affect of applying one rotation to the other.

I believe this one will do it, but if not try the second example:

  objectB.transform.rotation = objectA.transform.rotation * objectB.transform.rotation;

The order matters, so the above will not result in the same rotation as:

  objectB.transform.rotation = objectB.transform.rotation * objectA.transform.rotation;