ARCHIMED software has been used to estimate the radiative environment of plant stands constituted by 3D virtual plants. The 3D virtual trees used for computation of radiative characteristics were built using the plant generator AMAPsim. Modelling of the functioning of meristems is based upon stochastic processes. The architecture of plants was described at the individual level and simulated according to botanical rules. The radiation transmitted to the crop level was also calculated from analysis of hemispherical photographs. Both methods were applied to two-strata agroforestry systems with Acacia mangium or with Tectona grandis in Indonesia. A comparison between light partitioning maps from radiative transfer simulation and from hemispherical photographs is made.