GoPro? GoPro? GoPro?
GoPro?
http://www.interaction-ipsj.org/archives/paper2011/interactive/0237/2INH-8.pdf https://webspace.utexas.edu/yl3663/~ylee/shadowdraw/shadowdraw.html
http://www.interaction-ipsj.org/archives/paper2011/interactive/0237/2INH-8.pdf
https://webspace.utexas.edu/yl3663/~ylee/shadowdraw/shadowdraw.html