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rotation axis

R

Rob Richardson

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unitedkingdom
Is it possible to change the rotation axis so that an animation such as an aileron rotates through just the one axis.
I have animated my ailerons OK, took no time at all, but I’m working with three axis.
The result is perfect but is there a better way?
I have followed krispy 1001’s tutorial on creating a new axis which is good, the part will move in all directions on this new axis but still rotates on the default.
 
Rob Richardson said:
Is it possible to change the rotation axis so that an animation such as an aileron rotates through just the one axis.
I have animated my ailerons OK, took no time at all, but I’m working with three axis.
Click to expand...

If I understand this correctly, you want the rotation to affect one axis only? This is possible, but it involves understanding the notions of Parent space and Local space or inherently, local axis. Maybe if I explain the process, you can understand.

First, notice that every object has a "Local Space" defined by three Local axis. These are visible when you set the Transform orientation to Local. Also, hitting X, Y or Z twice while doing a transform or extrude-operation locks the local axis. That is what you want to do with your rotation animation.

You might have noticed, that locking the rotation to a local axis while animating may not have the desired effect. The solution to that is discussed in the following thread:

Blender local rotation issue

In general, you want to setup the object's local space so that one local axis coincides with the rotation axis of the object's animation. Then you need to setup an empty as parent so that the local space of the object coincides with the empty's local space, while the empty assumes the orientation with regard to World Space ("Global" transform orientation). So...
  1. After setting up the object's geometry and local space, Create a Transform Orientation from the object Local Space (as backup).
  2. Then create an empty at the Origin of the object.
  3. Align both to Global transform orientation.
  4. Set Empty as Parent to object (Ctrl + P)
  5. Align Empty to backup transform orientation from step 1.
  6. Animate.
If you need further help with the topic, don't hesitate to ask. Hope this helps...

Cheers :)
 
Thank you very much for your help,
I think that all makes sense to me, I'll understand more once I have been through the process and made a few of my own mistakes!
The principle is very similar to that I used in FSDS its just a case of knowing which button to push in Blender.
 
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