text: Title: vector_animation_k3d.ipynb
  Body: Widgets show double objects. Interestingly "screenshot" is For example:
  
  OS - screenshot:
  <img width="666" alt="screen shot 2018-06-21 at 16 52 07" src="https://user-images.githubusercontent.com/1192310/41727078-c78f06fc-7573-11e8-9d72-1483bf96f3fc.png">
  ![k3d-1529592599276](https://user-images.githubusercontent.com/1192310/41727079-c7ab0640-7573-11e8-9e47-9d79403f7300.png)
  
  Correct screenshot:
  ![k3d-1529592599276](https://user-images.githubusercontent.com/1192310/41727275-3a63dd10-7574-11e8-90e7-cca87e62985b.png)
  
  