Optimal view angle in the three-dimensional self-propelled particle model Yu-Jian Li, Su Wang, Zhong-Lin Han, Bao-Mei Tian, Zhen-Dong Xi and Bing-Hong Wang EPL, 93 6 (2011) 68003 Published online: 18 March 2011 DOI: 10.1209/0295-5075/93/68003