Title: Improving Locality in Multi-Pass Soft ShadowsDate: Tuesday, February 11, 2014Time: 2:00 p.m.Location: EB II, Room 3211Examination Committee:Dr. R. Chirkova (Chair and department representative)Dr. B. Watson (Adviser)Dr. R. St. Amant (Area representative)All the department's graduate faculty and students are invited.* * *Title: Improving Locality in Multi-Pass Soft ShadowsAbstract: Shadows have been identified as a perceptually important part of visual scenes. Shadows provide static and dynamic visual clues about the location, shape, and arrangement of objects in an environment, as well as various characteristics about light sources. Soft shadows are a phenomenon created by the direct and indirect interaction of light with objects and the environment. Unlike less complex but visually inaccurate hard shadowing solutions, physically correct soft shadows are costly to compute in real time due to the complex behavior of light. Scene illumination algorithms based on ray tracing or rasterization can accurately calculate soft shadows, but lack the real time performance necessary for interactive applications. Soft shadowing algorithms require a large amount of computation; however, much of this computation is similar. We examine the use of recently introduced graphics hardware features to take advantage of this similarity and improve performance. We present an initial algorithm that restructures shadow computations using these new features to achieve real time performance.