koobas.hobune.stream
Setting quaternion value around local z axis
In the Unity Editor sometimes when you rotate a object around the blue axis (i.e. the local Z axis using the blue circle) it modifies the local Y rotation of an object, sometimes it modifies the local Z rotation of the object. I understand that this is because of the way euler angles work where you can potentially have several euler angles for every one quaternion. It does however pose a problem for me.
I want to adjust an objects rotation to some value and then to set it's rotation around its local blue axis back to what it was previously. The problem is that simply storing the local Y rotation or local Z rotation and setting it back to that doesn't work because of the problem I highlighted in the first paragraph where Unity often flips between the two. So I guess my question is how do I solve this? How do I store the quaternion value around the local Z/blue axis and then set it back to it's previous value?
I've been stumped for days so any help would be much appreciated!
Thanks guys :)
Never use:
rotation.y = <some value>;
or
rotation.z = <some value>;
Because rotation is quaternion having 4 parameters,viz.,x,y,z,w , ins$$anonymous$$d of 3,viz.,x,y,z. If you want to set your rotation to something, use:
rotation = Quaternion.Euler(<some value>,<some value><some value>);
or
rotation = Quaternion.EulerAngles(<some value>,<some value><some value>);
PS: the first uses Degrees and the second one uses Radians I guess, but not sure.. I use the First, becoz it gives me the results i want.
Thanks for the response! Presumably you'd have the same problem with that though, as with regular local Euler angles? i.e. transform.localEulerAngles?
Create an empty GameObject and orient that to your desired default orientation. Add the game object you are manipulating as a child of that game object. Now you can manipulate the orientation of your child game object however you want without affecting the parent orientation. When your game runs it can simply manipulate the parent object to move it around or whatever you want to do with the object.
Sorry, maybe I didn't explain it quite right. The problem I'm having is with setting a euler angle on a specific axis back to it's previous value, i'm not sure if adding a parent would do anything to rectify that?
