GEARS: A General and Efficient Algorithm for Rendering Shadows

Lili Wang, Ze Wang, Yulong Shi, Voicu Popescu
State Key Laboratory of Virtual Reality Technology and Systems, School of Computer Science, and Engineering, Beihang University, Beijing China, 100191
Beihang University, 2012


   title={GEARS: A General and Efficient Algorithm for Rendering Shadows},

   author={Wang, Lili and Wang, Ze and Shi, Yulong and Popescu, Voicu},



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We present a soft shadow rendering algorithm that is general, efficient, and accurate. The algorithm supports fully dynamic scenes, with moving and deforming blockers and receivers, and with changing area light source parameters. The algorithm computes for each output image pixel a tight but conservative approximation of the set of triangles that block the light source as seen from the pixel sample. The set of potentially blocking triangles allows estimating visibility between light points and pixel samples accurately and efficiently. As the light source size decreases to a point, our algorithm converges to rendering pixel accurate hard shadows.
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