achao2013

Results 2 issues of achao2013

i run the demo successfully, but i can't open the demo.gif that the python code gernerate , the ie screen is as follows: ![111](https://cloud.githubusercontent.com/assets/5026576/14346205/b2cc4a64-fce3-11e5-9f7a-4a09f9471db8.png)

Why x_i and x_j can share the same blending weights? The depth changes when point k motion from frame i to frame j.