stevec@bu-pub.bu.edu (Steve Connelly) (04/02/91)
The Siggraph `91 Conference On Computer Graphics and Interactive Techniques will be held July 29 - August 2 in Las Vegas, NV. The following contains selected portions of the recently released Siggraph '91 Preliminary Program: Computer Graphics Achievement Award ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Awarded to persons who have significantly aided and inspired the progress of computer graphics research. This Year's Winner : Jack Daniels Previous Winners: Miss November, 1972 the Mandrill Juan Veldez Nelson and Minnie Max General Gao of Szechuan TECHNICAL PAPERS ============================================================================ Simulation of Motion Blur, Penumbra, and Soft Shadows by Jittering the Film Recorder. Advances in Physically-Based X Windows: Shattering, ScrollBar Momentum, ChainSaw and Paste, Pixmap Tile Grout. A Bidirectional Pipeline Architecture for Publishing the Same Algorithm in Both Graphics and Vision. Lens Cap and Thumb Models for the Simulation of Amateur Photographic Effects. Butta-Splines : A Class of Surfaces with the Continuity of a Baby's Butt. Real-Time Postscript on a 30 Pages-Per-Second Printer and the Resurgence of the American Lumber Industry. An Implicit Equation for the Utah Teapot. Quaaludes : Shortening Perceived Rendering Time by Altering the User. The Litmus Test : Using pH Measurements to Distinguish the Research of Pat Hanrahan, Paul Haeberli, and Paul Heckbert. Spherical Fractals and the Production of Benoit Balls. TUTORIALS ============================================================================= Tutorial : The Monte Carlo Method as a Way of Avoiding Math ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Tutorial : Careers in Computer Graphics ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Participants will learn about opportunities in the graphics industry and will be introduced to conversational Japanese. Tutorial : Successful Grant Procurement ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Director of the Cornell Buzzword Concatenator Project presents his method of proposal writing and discusses in detail his highly successful 1990 NSF-funded project, "Parallel Neural Networks for the Physically-Based Adaptive Subdivision of NURBS in Multidimensional Ray-Traced Radiosity of a Virtual Reality Visualization". Tutorial: Introduction to Computer Graphics ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Participants will learn that "radiosity" means to lighten up the pastel-colored things that are dark and that "teleological modeling in a classical Newtonian regime" means to connect the parts with springs. Tutorial: Landscaping for Real-Time Graphics Companies ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Computer graphics has struggled to model objects with photographic realism. In the case of manufactured objects, the solution has been to force all manufacturers to use CAD/CAM so that the man-made environment consists of simple geometries. A modification of this solution can be applied to the natural environment. We will discuss how to prune evergreens into cones and how to shape shrubs into spheres and rectilinear hedges. Landscaping your company's property using these techniques will allow your simplistic models of nature to match exactly the view outside the window, fooling visiting customers. PANELS ============================================================================= Panel : Graphics Hardware Standards ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The panelists will address the surge of interest in standard, interchangeable graphics components. Such standards are of topical importance because, as graphics manufacturers go out of business, it would be convenient if their products could be disassembled and plugged directly into Silicon Graphics products. Panel : Raster Image File Format Standards ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Chairman : N. AfricanAmericanPonte, MIT Media Lab Panelists: M.W. Mantle, Pixar "We should be happy to live in a country with so many raster image standards to choose from." S. Thomas, Univ. of Michigan "I don't know which universal image standard everyone is going to use, but I know which one I'm going to use." A. Warhol, independent "In the future, everyone will design an image format that will be the industry standard for fifteen minutes." EXTENDED ABSTRACTS OF SELECTED TECHNICAL PAPERS ============================================================================= Paper : Subpixel Rendering of Bicubic Patches ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Third-order patches have been rendered by subdividing them into second-order patches, first-order polygonal surfaces (Lane-Carpenter), and zero-order pixel-sized surfaces (Catmull). We suggest continuing the subdivision until the subpatch is the size of a molecule, where it can be rendered by a standard molecular modeling package. Molecules have advantages also in creating realistic models. In the same way that Euler operations guarantee that a model is topologically realizable, modeling with molecular primitives guaranteed that a model could be manufactured with real molecules. To verify the modeler, we invoke the Weierstrass theorem, which states that any object can be made from any primitive if you use alot of them. We implemented uncharged atoms in C, ions in C++. Paper : Laser Beam Tracing ~~~~~~~~~~~~~~~~~~~~~~~~~~ Ray tracing is slow, which is ironic since the rays are supposedly traveling at the speed of light. Most of the time is spent in the ray-surface intersection. The authors feel that, having done all the work of intersecting with a surface, the ray should do more when it gets there. Laser rays provide the energy for this work. Instead of antialiasing the image, the ray locally melts the surface colors, blurring them. Likewise, when a laser ray hits a polygonal object, the sharp angles are eroded away to create a smooth surface. If the force of rays is varied, then bumpy surfaces are realized. Translucency occurs when some rays are strong enough to blow right through the surface. Likewise, penumbra is accomplished when some rays blast through objects while proceeding to the light source. Paper : Scaling Properties of Patents on Fractals ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ The author has patented "fractal" functions for the creation of synthetic images. A fractal exhibits statistical "self-similarity", wherein the function reveals the same statistical composition regardless of the scale at which it is considered. Thus, the author's patent applies at all possible scales. Fractals can be characterized by their "fractional dimension", which is intuitively a measure of their roughness. Since changing the fractional dimension of a fractal creates a new fractal, the author's patent extends to fractals of any roughness. A fractal surface of zero roughness is a smooth surface, so the author's patent subsumes all smooth surface methods in computer graphics. While fractals describe the smooth surfaces of man-made objects, they also describe the irregular, intricate objects of the natural world, and thus fall under the author's patent. Even if nature was not composed of fractals, the retinal veins in front of the rods and cones are fractal, so nature would look fractal anyway. Fortunately for the author, nature really is fractal. The geometry of galaxies can also be described by fractals. Thus, all natural and man-made objects are fractal when considered at a very large scale. Thus, because the author's patent exhibits scaling, it applies to all natural and man-made objects. Due to self-similarity, fractals exhibit small variations over small distances and large variations over large distances. Since length, width, and height can only change by small amounts over small distances but can change by large amounts over large distances, space itself is fractal and thus is covered by the author's patent. Paper : Calculating Light Intensities in the Presence of a Participating Medium ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ During a seance, the participating medium draws forth the ghost of Omnibus Graphics. We present a method of simulating the scattering/absorption of the resulting apparition density. Paper : The Fast Furrier Transform ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We introduce a method of rendering furry surfaces, and present results of our experiments in producing a synthetic furry teddy bear. In the same way a furrier strips the hide off an animal and wraps it around a blue-haired woman, we stripped the hide off a koala bear and digitized it so it could be mapped onto a synthetic bear model. To obtain the 3D geometry of the teddy bear, we sliced the nude koala bear into serial sections, which were digitized. It is interesting to note that "rendering" can also mean "dismembering and grinding up". Paper : The Application of Computer Graphics to Hardcore Pornography ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Contrary to the ambient opinion that computer animation has no applicability, we suggest it is well-suited to pornography. It is true that porn requires accurate rendering of the human form. However, once generic male and female forms are created, all other forms are of the same topology. Porno stars generally differ from generic forms only by excessive local scaling factors. Also, while the facial expressions of the actors need to be duplicated, the acting ability of today's stars suggests that "male concentration" and "female boredom" would be a sufficient vocabulary of expressions. Furthermore, the difficult problems of rendering clothing and lip-synching dialogue are avoided. The actors' surfaces are emissive, transmissive, submissive, and permissive. Porn is well-suited to computer animation techniques because most of the action is rhythmic and periodic, requiring the rendering of only one cycle. Any dynamics that cannot be resolved procedurally might be addressed by the VPL DataCondom. In advanced pornographical animations systems, constraint-based optimization will properly assemble large orgies such that each character plugs into his/her topological complement. The system will plug together a gay male and lesbian female by introducing a hermaphrodite as an adapter. Until realistic human bodies are perfected, current synthetic characters could succeed in porn via such vehicles as "Bogie and Marilyn Do It French(-Canadian) Style", "Sexy Robot Straightens Wally B's Stinger", and "Behind Closed Doors: What You Never Knew About the Luxo Family". Paper : Solutions for Unemployment in Graphics ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In 1974, Sutherland, et al. presented "A Characterization of Ten Hidden-Surface Algorithms", which revealed how such algorithms could be unified as types of spatial sorting. Today's research solves the hidden-surface problem with ray tracing, which was not one of the ten algorithms. Clearly, ten researchers are out of work. It is difficult for any laborer when he is replaced by a computer. Supercomputers and special-purpose hardware have replaced the hidden-surface researchers, and the result is grim. Gary Watkins and Robert Schumacker are stuck in management positions. John Warnock, while not being forced to live in Utah, has been reduced to typesetting. One of the ten unemployed researchers was the inventor of the depth buffer. Fortunately, in 1986 he was pushed again to the forefront of research when the depth buffer was used to render the facets of hemi-cubes as part of the view-independent radiosity computation. The method works for static scenes such as graphics programmers waiting for a radiosity method to finish. For the other hidden-surface researchers, graphics has now developed a severance plan in the form of the ZZBuffer. The ZZBuffer speeds up ray tracing by spatially sorting all objects with respect to an eyepoint. Thus, ZZBuffer creation can be improved by using the ten hidden surface algorithms, giving ten researchers a new lease on life. Advancements in Cheating for the Animation of Synthetic Faces ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ We present a new device for tracking facial shape and motion so that you can use the data to animate a face model despite your lack of actual physiological understanding. The first person to steal geometry from a real face in order to make a synthetic face was H. Gouraud. (Gouraud and his University of Utah colleagues B.T. Phong and J.W. Flat are renowned for inventing the shading methods that bear their names.) Gouraud convinced his wife to have a grid drawn on her face so she could be digitized. Unfortunately, in his zeal Gouraud had the grid tattooed on instead. Mrs. Gouraud won her husband's VW in the ensuing divorce, and she went on to marry a Zulu prince who fancied her makeup. Two decades later, researchers are still painting geometric landmarks on innocent people's faces. Some researchers have sought out persons with measles or severe acne from which to photogrammetrically derive geometry, but the concept is the same. One researcher wanted to create facial animations by interpolating between CAT scans of specific facial expressions. It's still cheating. We present a new product for cheating: The VPL DataBurnoose. The burnoose is a nylon stocking worn over the head. The stocking is lined with the same fiber optic measurement technology used in the tiny datasuits employed by David Zeltzer in his animations of cockroaches. The device has a special multisensor pouch in which the tongue is put. The burnoose adheres to the face tightly enough that eye motion can be tracked. Retrospective : Flying Logos ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In the movie "2001 : A Space Odyssey", an ape, touched by intelligence, finds a femur that looks like an upper-case "I". In a moment of ecstatic rage he throws the bone in the air, realizing mankind's first flying letter. Since then, man has sought to make his words fly. Ancient hieroglyphic symbols are often in the shapes of eagles and hawks. From the paper airplane to aerodynamic sans serif fonts, mankind has been driven to make his words fly. Today we enter a new age of alphabet flight with the Logo Butterfly, which boasts 26 special-purpose processors, keeping mankind safe from the age-old fear of name dropping. GENERAL INFORMATION ~~~~~~~~~~~~~~~~~~~ The multiple ribbons formerly worn below the name tag will now hang down from the crotch so as to better serve as indicators of social hierarchy within the herd. [ compiled by stevec@bu-pub.bu.edu and tjh@bu-pub.bu.edu. ]