This paper by Li et al. proposes a method for reconstruction and rendering visual hulls using programmable graphics hardware. The visual hull is an approximate 3D geometry representation that is reconstructed from multiple silhouette images. Projective texture mapping and alpha channel modulation are exploited to reconstruct visual hulls implicitly in image-space. View-dependent textures can be applied in the same rendering pass. The performance of this approach is significantly faster than that of previously reported similar systems. (Hardware-accelerated Visual Hull Reconstruction and Rendering. In Proceedings of Graphics Interface 2003).