Archive for the ‘Links’ Category

Link Mini-Dump 08/17

Monday, August 17th, 2009

 

SIGGRAPH ASIA 2009 paper acceptance notification was sent out – here’s a paper list at the usual place: Ke-Sen Huang. No papers links yet.

Approximating Higher Order Texture Filtering @ Iñigo Quílez’s website

Assembly 2009 Seminar Videos

Maciej Sinilo’s SIGGRAPH 2009 link collection

Still waiting for waiting for Advances in Real-time Rendering course notes to pop up on Bungie’s website.. come on already ;)

Energy Conservation

Saturday, July 25th, 2009

Rory Driscoll had a good post in his blog a few months ago reminding everyone about energy conservation in lighting models.  Energy conservation simply means that the amount of reflected energy from a point is equal to the amount of energy incident to that point.  This is particularly noticeable in specular reflection models where the overall brightness of the specular term changes with the specular exponent.

Anyway, there were a few good replies to his post with derivations of the normalization terms required to conserve energy provided by Fabian “ryg” Giesen of Farbrausch. The lighting models used by most games won’t account for energy conservation across diffuse and specular terms but adding a normalization term is a simple step to take.