A model for forward-diffuse scattering through a wall

In this paper a novel model for forward diffuse scattering of indoor walls is presented which is suitable for integration in ray-based prediction tools for indoor environment. The model extends the already-available Effective-Roughness (ER) diffuse-scattering model in a straight-forward way and allows for a different scattering behaviour of the wall in the backward and forward half-spaces to be described. The model is checked against measurements on a wall sample and it is shown to sensibly improve the accuracy of the prediction of the overall scattering pattern of the wall.