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Ontario Tech acknowledges the lands and people of the Mississaugas of Scugog Island First Nation.

We are thankful to be welcome on these lands in friendship. The lands we are situated on are covered by the Williams Treaties and are the traditional territory of the Mississaugas, a branch of the greater Anishinaabeg Nation, including Algonquin, Ojibway, Odawa and Pottawatomi. These lands remain home to many Indigenous nations and peoples.

We acknowledge this land out of respect for the Indigenous nations who have cared for Turtle Island, also called North America, from before the arrival of settler peoples until this day. Most importantly, we acknowledge that the history of these lands has been tainted by poor treatment and a lack of friendship with the First Nations who call them home.

This history is something we are all affected by because we are all treaty people in Canada. We all have a shared history to reflect on, and each of us is affected by this history in different ways. Our past defines our present, but if we move forward as friends and allies, then it does not have to define our future.

Learn more about Indigenous Education and Cultural Services

January 23, 2013

Speaker: William Sherif, MSc Student, Ontario Tech University

Title: Real-Time Global Illumination Techniques

Abstract: A number of techniques for displaying global illumination in real-time appeared in the past fifteen years or so. Baked-in radiosity has been used in games since Quake in 1996. Precomputed radiance transfer was first published by Sloan in 2002. Screen-space methods based on deferred shading techniques such as SSAO and SSDO were developed in 2007 and 2009 respectively. In 2011, the first AAA title to use real-time radiosity was released. Real-time ray tracing is not very common yet, but several demo applications exist, showing RTRT is possible on modern GPUs.

We present two new ideas. Spherical harmonics are introduced as an alternative to spherical harmonics, by substituting the Chebyshev polynomial in the place of the Legendre polynomial as the orthogonal polynomial in the spherical harmonics definition. Vector occluders are introduced as a novel, precomputed, real-time, empirical technique for adding global illumination effects to a locally illuminated scene on static geometry.