ABSTRACT
Realism has long been an important goal for both offline and interactive renderers. Global illumination provides visual richness not achievable with direct illumination models and plays a vital role in perceived realism. Unfortunately the cost of global effects generally precludes use in interactive applications and has led to the development of numerous approximations, including screen-space approximations [Ritschel et al. 09], fast ray tracing via intelligent shooting of select rays [McGuire and Luebke 09], and instant radiosity solutions [Dachsbacher and Stamminger 06].
