Papers by John Anderson

	Artistic Simulation of Curly Hair Hayley Iben, Mark Meyer, Lena Petrovic, Olivier Soares, John Anderson, Andrew Witkin July 2013 Artistic simulation of hair presents many challenges - ranging from incorporating artistic control to dealing with extreme motions of characters. Additionally, in a production environment, the simulation needs to be fast and results need to be usable "out of the box" (without extensive parameter modifications) in order to produce ... [more] Available as Pixar Technical Memo #12-03b Other versions: June 2012
	Animating Oscillatory Motion With Overlap: Wiggly Splines Michael Kass, John Anderson June 2008 Oscillatory motion is ubiquitous in computer graphics, yet existing animation techniques are ill-suited to its authoring. We introduce a new type of spline for this purpose, known as a ``Wiggly Spline.'' The spline generalizes traditional piecewise cubics when its resonance and damping are set to zero, but creates oscillatory animation when its resonance and damping ... [more] Available in SIGGRAPH 2008 Available as Pixar Technical Memo #06-06a Other versions: January 2006
	Key Point Subspace Acceleration and Soft Caching Mark Meyer, John Anderson May 2007 Many applications in Computer Graphics contain computationally expensive calculations. These calculations are often performed at many points to produce a full solution, even though the subspace of reasonable solutions may be of a relatively low dimension. The calculation of facial articulation and rendering of scenes with global illumination are two example applications that ... [more] Additional materials: [SiggraphSlides.pdf], [softCaching.mov] Available in the proceedings of Siggraph 2007 Available as Pixar Technical Memo #06-04b Other versions: January 2006
	Statistical Acceleration for Animated Global Illumination Mark Meyer, John Anderson January 2006 Global illumination provides important visual cues to an animation, however its computational expense limits its use in practice. In this paper, we present an easy to implement technique for accelerating the computation of indirect illumination for an animated sequence using stochastic ray tracing. We begin by computing a quick but noisy solution using a ... [more] Additional materials: [ShotRender.mov] To appear in SIGGRAPH 2006 Available as Pixar Technical Memo #06-03
	Volumetric Methods for Simulation and Rendering of Hair Lena Petrovic, Mark Henne, John Anderson January 2005 Hair is one of the crucial elements in representing believable digital humans. It is one of the most challenging elements, too, due to the large number of hairs on a human head, their length, and their complex interactions. Hair appearance, in rendering and simulation, is ... [more] Additional materials: [clip1.mp4], [clip2.mp4], [clip3.mp4], [clip4.mp4], [clip5.mp4], [clip6.mp4] Available as Pixar Technical Memo #06-08