Décoret, Fast scene voxelization and applications

Figure 1: Slicemaps (small figures), can be used for several applications and a variety of effects. Distance is encoded in color, what leads to an efficient voxel representation of the scene. Transmittance shadow maps use this information to attenuate light passing through semi-transparent surfaces (shadows of the trees). We also show that the obtained volume estimation can be used for refraction (lion). This sketch paper presents an overview of ”Fast Scene Voxelization and Applications ” published at the ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games. It introduces slicemaps that correspond to a GPU friendly voxel representation of a scene. This voxelization is done at run-time in the order of milliseconds, even for complex and dynamic scenes containing more than 1M polygons. Creation and storage is performed on the graphics card avoiding unnecessary data transfer. Regular but also deformed grids are possible, in particular to better fit the scene geometry. Several applications are demonstrated: shadow calculation, refraction si-mulation and shadow volume culling/clamping.