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Shadows are important visual cues. Shadow map represents an efficient algorithm for computing shadows from point and directional light sources. A shadow map keeps the directional distances of the closest objects from the light source. Once it is computed by any rendering technique, determining the visibility of the light from any point requires constant time. This report proposes a new approach to construct a multiple-level shadow map at each end-point of the linear light source. The multiple-level structure of shadow maps reduces the traditional problem related to holes. By combin- ing the information of two aligned shadow maps, a polygonal shadow map is derived to determine the visible segments of the linear light. The results are promising but more work is required to reduce the memory requirements and imprecision due to the sampled information from the shadow maps.

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  author =       "Yi-Jen Huang",
  title =        "An Extended Shadow Map for Shading with Linear Light Sources",
  month =        april,
  year =         1996,
  type =         "M.Sc. Thesis",
  school =       "McGill University",