2006-11-11 Importance Driven Path Tracing using the Photon Map 3dcg Henrik Wann Jensen 1995http://citeseer.ist.psu.edu/cache/papers/cs/11756/http:zSzzSzgraphics.lcs.mit.eduzSz~henrikzSzpaperszSzewr6.pdf/jensen95importance.pdfを読む。