Let me introduce the the sphere bot.
A robot which can transform into the most stable form (Sphere) for protection or just to roll around for fun.

Geometry:

* Triangles: 6462
* Vertices: 11281

Modelled, rigged and animated in Blender 2.77a for the textures I used 3d-coat.

Animation preview on Sketchfab

* https://sketchfab.com/models/6c3a32958c2d43cdbf12a7109616bdbe

**Animations in scene:**

* Rolling
* Opening / Idle
* Walk
* Run
* Attack
* Run attack
* Jump/ Fly

Test in Unreal 4

* https://goo.gl/gLgePC

Test in Unity

* https://goo.gl/fV5NTq

https://www.youtube.com/watch?v=ExTJsvq1BlE

[The high-poly version](https://www.blendswap.com/blends/view/92151)

[](https://www.blendswap.com/blends/view/92151)