2016-01-07 NOTES ON IMPORTANCE SAMPLING PBR NOTES ON IMPORTANCE SAMPLING http://blog.tobias-franke.eu/2014/03/30/notes_on_importance_sampling.html ※ 読み返してみたら, 結構 良い内容でした. Maxima http://maxima.sourceforge.net/ Wolfram Alpha http://www.wolframalpha.com/ Related article : "GPU-Based Importance Sampling" GPU Gems 3 http://http.developer.nvidia.com/GPUGems3/gpugems3_ch20.html