The discontinuous vegetation canopy widely exists in the world

and the cone has been substituted for discontinuous vegetation canopy in this paper

in order to describe the Monte Carlo method used to simulate the radiant directionality of non-isothermal discontinuous target. Comparing the simulated result with that of indoor experiment

it shows a large difference when the relatively smooth target has been assumed to be Lambertin and only directive radiance of targets has been taken into account while the multi-scattering is ignored.