Real-time Kd-tree Based Importance Sampling of Environment Maps

Serkan Ergun, Murat Kurt, Aydin Ozturk
International Computer Institute, Ege University
Spring conference on computer graphics, 2012

   title={Real-time Kd-tree Based Importance Sampling of Environment Maps},

   author={Ergun, Serkan and Kurt, Murat and {"O}zt{"u}rk, Ayd{i}n},

   booktitle={Proceedings of the 28th Spring Conference on Computer Graphics},



   organization={Comenius University Press}


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We present a new real-time importance sampling algorithm for environment maps. Our method is based on representing environment maps using kd-tree structures, and generating samples with a single data lookup. An efficient algorithm has been developed for realtime image-based lighting applications. In this paper, we compared our algorithm with Inversion method [Fishman 1996]. We show that our proposed algorithm provides compactness and speedup as compared to Inversion method. Based on a number of rendered images, we have demonstrated that in a fixed time frame the proposed algorithm produces images with a lower noise than that of the Inversion method. We also demonstrate that our algorithm can successfully represent a wide range of material types.
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