Introduction to Renderman 1977: Star Wars IV: a New Hope

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1 History of RenderMan, I 2 Introduction to RenderMan 1977: Star Wars IV: A New Hope Mike Bailey [email protected] Oregon State University 1979: Ed Catmull, Alvy Ray Smith, and others leave NYIT to form the Computer Division of Lucasfilm This work is licensed under a Creative Image Digital Editing Effects Image/Volume Commons Attribution-NonCommercial- NoDerivatives 4.0 International License Processing and Compositing Rendering Hardware 1984: John Lassiter leaves Disney Animation to join Pixar Oregon State University Oregon State University Computer Graphics Computer Graphics IntroToRenderMan.pptx mjb – December 26, 2016 mjb – December 26, 2016 History of RenderMan, II 3 History of RenderMan, III 4 Pixar Animation Image/Volume Studios Rendering Hardware 1986: Steve Jobs buys Pixar for $10M Pixar Image Rendering Steve Jobs adds another $60M to keep Pixar running Computer Software 1986: Luxo Jr.– Nominated for an Academy Award Star Trek II (1982) Young Sherlock Holmes (1985) 1988: Tin Toy – won Academy Award for Best Animated Short REYES 1993: RenderMan wins a Technical Academy Award 1995: Toy Story RenderMan 1984 (1984) Pixar Animation 1995: Pixar IPO -- Steve Jobs’s stake is now worth $1.2B Studios RIB Shade Trees 2004: Pixar bought by Disney for $7B, making Steve Jobs’s stake now worth $3.5B Steve Jobs is now Disney’s largest shareholder (7%) – Oregon State University Oregon State University Computer Graphics prman Computer Graphicsway ahead of even Roy Disney (1%) mjb – December 26, 2016 mjb – December 26, 2016 5 6 Toy Story 2, Toy Story 3, RenderMan Software Rendering Pipeline Up, 2009 1999 2010 RIB File A Bug’s Life, 1998 Bounding Box Analysis Finding Nemo, 2003 Brave, 2012 Split Inside Out, 2015 Dice into Microfacets The Good Dinosaur, 2015 Finding Dory, 2016 Call the Shaders Wall-E, 2008 Ratatouille, 2007 Do Front-to-Back Compositing Monsters Inc, 2001 Monsters University, 2013 Cars 2, 2011 Cars, 2006 Assemble the Pixels The Incredibles, 2004 Oregon State University Oregon State University Final Image Computer Graphics Computer Graphics mjb – December 26, 2016 mjb – December 26, 2016 1 RenderMan Composites Starting at the Eye 7 RenderMan Renders at Higher-than-Screen-Resolution 8 First, let’s think about it back-to-front: color12 2 color 2(1 2 ) black , color01 1 color 1(1 1 ) color 12 , * color00 color(1 0 ) color 01 . Substituting gives us the front-to-back equation: * color00 color(1) 011 color (1)(1) 0 122 color (1)(1)(1) 0 1 2 black . Oregon State University Oregon State University Computer Graphics Computer Graphics mjb – December 26, 2016 mjb – December 26, 2016 2.

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Blue Screen Matting
Blue Screen Matting Alvy Ray Smith and James F. Blinn Microsoft Corporation ABSTRACT allowed to pass through and illuminate those parts desired but is blocked everywhere else. A holdout matte is the complement: It is A classical problem of imaging—the matting problem—is separa- opaque in the parts of interest and transparent elsewhere. In both tion of a non-rectangular foreground image from a (usually) rectan- cases, partially dense regions allow some light through. Hence gular background image—for example, in a film frame, extraction of some of the color film image that is being matted is partially illu- an actor from a background scene to allow substitution of a differ- minated. ent background. Of the several attacks on this difficult and persis- The use of an alpha channel to form arbitrary compositions of tent problem, we discuss here only the special case of separating a images is well-known in computer graphics [9]. An alpha channel desired foreground image from a background of a constant, or al- gives shape and transparency to a color image. It is the digital most constant, backing color. This backing color has often been equivalent of a holdout matte—a grayscale channel that has full blue, so the problem, and its solution, have been called blue screen value pixels (for opaque) at corresponding pixels in the color image matting. However, other backing colors, such as yellow or (in- that are to be seen, and zero valued pixels (for transparent) at creasingly) green, have also been used, so we often generalize to corresponding color pixels not to be seen.
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