Anti-Aliasing of Reflection Effects of Water Surface

Water surface is one of the most important components for rendering landscapes. The rendered spacious water surface with periodic wavelets such as on the lakes and reservoirs is very easy to make aliasing and/or moiré in the regions far from the viewpoint. In periodic bump mapping on a plane with strong reflection, moiré pattern appears. The reflection rays on the wavelets are scattered by the bumped surfaces. We propose how to estimate the scattering ranges and then sample from the corresponding area on an image space. Both the rendered images and animations show excellent effects on the water surface of a reservoir.