  We consider a $N$-particle interacting particle system with the vision
geometrical constraints and reflected noises, proposed as a model for
collective behavior of individuals. We rigorously derive a continuity-type of
mean-field equation with discontinuous kernels and the normal reflecting
boundary conditions from that stochastic particle system as the number of
particles $N$ goes to infinity. More precisely, we provide a quantitative
estimate of the convergence in law of the empirical measure associated to the
particle system to a probability measure which possesses a density which is a
weak solution to the continuity equation. This extends previous results on an
interacting particle system with bounded and Lipschitz continuous drift terms
and normal reflecting boundary conditions by Sznitman[J. Funct. Anal., 56,
(1984), 311--336] to that one with discontinuous kernels.
