Proceedings: GI 1996

Rendering caustics on non-lambertian surfaces

Henrik Jensen

Proceedings of Graphics Interface '96: Toronto, Ontario, Canada, 22 - 24 May 1996, 116-121

DOI 10.20380/GI1996.14

  • BibTeX

     title = {Rendering caustics on non-lambertian surfaces},
     author = {Henrik Wann Jensen},
     booktitle = {Proceedings of the Graphics Interface 1996 Conference, May 22-24, 1996, Toronto, Ontario, Canada},
     year = {1996},
     month = {May},
     isbn = {0-9695338-5-3},
     publisher = {Canadian Human-Computer Communications Society},
     url = {},
     pages = {116--121}


This paper presents a new technique for rendering caustics on non-Lambertian surfaces. The method is based on an extension of the photon map which removes previous restrictions limiting the usage to Lambertian surfaces. We add information about the incoming direction to the photons and this allows us to combine the photon map with arbitrary reflectance functions. Furthermore we introduce balancing of the photon map which not only reduces the memory requirements but also significantly reduces the rendering time. We have used the method to render caustics on surfaces with reflectance functions varying from Lambertian to glossy specular.