Abstract: Natural surfaces are often complex: they nearly always exhibit small scale imperfections such as dirt, dust, cracks, scratches, wrinkles, etc., as well as large scale structural elements, as for wickerwork, rattan, coarse grainy sands, brick walls, textiles, pebbles, lawns, etc, that are generally too complex to be modeled explicitly. Unfortunately, most of these features cannot be rendered "accurately" using texture maps or bump maps only, because they introduce complex reflectance behaviors that cannot be captured through single color or normal variations. In this paper, we first propose a new multi-scale periodic texture model adapted to the efficient simulation of the previously mentioned features. This new model, combining notions of virtual ray tracing and bi-directional texture function, improves our previous technique by considering additional important effects, including self-shadowing and auto-emission. In a second step, the texture model is integrated into hierarchical radiosity with clustering. Therefore, an extension of radiosity techniques, currently limited to texture maps, bump maps and general (homogeneous) reflectance functions, is proposed. The final rendering consists of applying a second ray tracing pass, based on a gathering methodology adapted to the model. The method provides high quality images at a significant lower computation and memory consumption cost than with "explicit" models in the case of periodic features (wickerwork, grids, pavements, etc.).