Thank you, I’ll take that offer 
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I am having some troubles indeed: the door doesn’t show in my world. I’m using an Actor to display it, I can see the walking panda from the tutorial, but not my door next to it.
- I added an armature with two bones, one for each half-door.
- I made the half-doors children of the bones with a constraint.
- In pose mode, I created two keyframes for each bone: closed and open. When I play the animation in blender it looks nice.
- I exported the half-doors and the armature with yabee. I have a “door.egg” with a couple of joints plus the door meshes, and a “door_open.egg” with tables containing the interpolated angles for the 20 frames of the animation.
My door doesn’t have a material yet, and usually it shows in pure white. But when I load it as an Actor, it doesn’t show at all.
Here’s the blend file:
https://www.box.com/s/8a67545072f1870eb576
It may have lost its materials since I link them from a library, but the rest should work.
What did I break again?