Halfline at point of contact
Discussion about the half-line of the sphere at the point of contact. Clip is from the Sept. 2012 NC I-Liq Chuan workshop.
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![Coolio - Gangsta’s Paradise (feat. L.V.) [Official Music Video]](https://sun9-70.userapi.com/OEP2m5uvCO0VICgAahl5ddW3dhfJXeyZheCdQg/B6getCYYTJI.jpg)
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![Coolio - Gangsta’s Paradise (Official Music Video) [HD] ft. L.V.](https://sun9-65.userapi.com/zi4OiOK3kaP2lmcUVplzHFcWmkyfxKAV8mhTLQ/M4ePuDnsHPY.jpg)
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