I have created a coin model in blender that has a simple spinning animation. I've exported this to an FBX, and the animation appears fine in other FBX viewers.
When I import it into the encode tool, the animation is picked up, but with these weird wobbling artifacts. These artifacts appear to be different every time the model is re-exported from Blender and imported into the encode with no changes to the model.
fbx from blender and wt3 file from the encoder are attached
I managed to reproduce what you are describing. Since your model is working in the FBX reviewer, we'll treat this as a bug of the Wikitude 3D encoder. I'll have created internal bug report for it.
Thanks for that.
I did find a work around for it. It seems to be caused by some rounding issue with the rotation value in the intermediate frames. When I set the key frames to be every 25 frames for 90 degrees of rotation instead of 24 the problem seemed to go away.