*** Apologies for Cross-posting *** *** DOUBLE EVENT Day MONDAY 9th November 2009. 1pm and 2pm GMT ***
*** PS Wine available - and there is now an extra special Stereoscopic NASA video show sequence *** ----- Graham Fyffe, "Cosine Lobe Based Relighting from Gradient Illumination Photographs" Monday 9th November 2009, 1-2pm Room 1.10, Kilburn Building The University of Manchester Abstract: We present an image-based method for relighting a scene by analytically fitting a cosine lobe to the reflectance function at each pixel, based on gradient illumination photographs. Realistic relighting results for many materials are obtained using a single per-pixel cosine lobe obtained from just two color photographs: one under uniform white illumination and the other under colored gradient illumination. For materials with wavelength-dependent scattering, a better fit can be obtained using independent cosine lobes for the red, green, and blue channels, obtained from three monochromatic gradient illumination conditions instead of the colored gradient condition. We explore two cosine lobe reflectance functions, both of which allow an analytic fit to the gradient conditions. One is non-zero over half the sphere of lighting directions, which works well for diffuse and specular materials, but fails for materials with broader scattering such as fur. The other is non-zero everywhere, which works well for broadly scattering materials and still produces visually plausible results for diffuse and specular materials. Additionally, we estimate scene geometry from the photometric normals to produce hard shadows cast by the geometry, while still reconstructing the input photographs exactly. ----- Carlye Archibeque, 2009 SIGGRAPH Computer Animation Festival, Executive Producer "CAF (Computer Animation Festival) Screening" Monday 9th November 2009, 2-3pm Room 1.10, Kilburn Building The University of Manchester Abstract: Carlye Archibeque will be presenting some of the best SIGGRAPH animation video clips from the 2009 DVD collection. This covers a unique set of animation from professional houses to amateur enthusiasts all of whom have excelled in excellence. Wine will be available to help the event. ----- Part of http://manchester.siggraph.org/ ----- Anyone wishing to view a discussion via Access Grid should note the following. Please check the Jabber room shortly before the start of the seminar to find if ScreenStreamer is to be used. Virtual Venue: University of Manchester Room1:10 Jabber Room: university-of-manchester-(1.10) (sam.ag.manchester.ac.uk)@conference.mcs.anl.gov ScreenStreamer: Preferably use ScreenStreamer software - go to http://www.memetic-vre.net/software/ScreenStreamer/ScreenStreamer.php and select room "University of Manchester (1.10)" from the AGSC section. Grab the screen feed (by clicking on it) from the screenstreamer window and resize it - more info can be found on http://www.memetic-vre.net/software/ScreenStreamer. Alternatively, the screenshot (not animated) can be accessed at http://192.150.184.66:7890 (this IP might change for some sessions - please check Jabber). PS the video show may not have full quality etc.
