Luxo Jr. Plan. Team. Movies. Why Computer Graphics? Introduction to Computer Graphics. Pixar Animation Studios, 1986 Director: John Lasseter


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1 Luxo Jr Introduction to Computer Graphics Pixar Animation Studios, 1986 Director: John Lasseter 2 Plan Introduction of the semester Administrivia Iterated Function Systems (fractals) 3 Team Lecturers Frédo Durand Barb Cutler TAs Rob Jagnow Patrick Nichols Course secretary Bryt Bradley Staff lists: TAs only: Staff: 4 Why Computer Graphics? Movies Movies Games CADCAM Simulation Virtual reality Visualization Medical imaging 5 6
2 Digression Games George Borshukov, vfx technology supervisor, ESC entertainment (The Matrix) Will give a talk at MIT Nov Simulation CADCAM & design 9 10 Architecture Virtual reality 11 12
3 Visualization Medical imaging What you will learn in Fundamentals of computer graphics algorithms Able to implement most applications just shown Understand how graphics APIs and the graphics hardware work What you will NOT learn Software packages CADCAM Photoshop and other painting tools Artistic skills Game design Graphics API Although you will be exposed to OpenGL Questions? Plan Introduction of the semester Administrivia Iterated Function Systems (fractals) 17 18
4 of the semester Ray Casting Ray Tracing For every pixel construct a ray from the eye Quiz 1 For every object in the scene Animation, modeling, IBMR Find intersection with the ray Keep if closest Choice of final project Rendering pipeline Quiz 2 Advanced topics 19 Ray Casting Ray Tracing For every pixel construct a ray from the eye Shade (interaction of light and material) Secondary rays (shadows, reflection, refraction 20 For every object in the scene Find intersection with the ray Keep if closest 21 Ray Tracing of the semester Original Raytraced image by Whitted Ray Tracing 22 Quiz 1 Animation, modeling, IBMR Choice of final project Rendering pipeline Image computed using the Dali ray tracer by Henrik Wann Jensen Environment map by Paul Debevec Quiz 2 Advanced topics
5 Animation: Keyframing Particle system (PDE) Animation Keyframing and interpolation Simulation ACM 1987 Principles of traditional animation applied to 3D computer animation 25 Rigid body dynamics Modeling Simulate all external forces and torques f2 (t ) f (t ) Curved surfaces Subdivision surfaces pb2 (t ) x (t ) p1b (t ) v (t ) p3 (t ) b f3 (t ) 27 Imagebased Rendering of the semester Use images as inputs and representation Ray Tracing E.g. Imagebased modeling and photo editing Boh, Chen, Dorsey and Durand 2001 Quiz 1 Animation, modeling, IBMR Choice of final project Rendering pipeline Quiz 2 Advanced topics Input image New viewpoint Relighting
6 The Rendering Pipeline The Rendering Pipeline Ray Casting For each pixel For each object Send pixels to the scene Rendering Pipeline For each triangle For each projected pixel Project scene to the pixels Transformations Clipping Rasterization Visibility of the semester Textures and shading Ray Tracing Quiz 1 Animation, modeling, IBMR Choice of final project Rendering pipeline Quiz 2 Advanced topics For more info on the computer artwork of Jeremy Birn see shadows Traditional Ray Tracing 35 36
7 Ray Tracing+soft shadows Ray Tracing+caustics Global Illumination Color Antialiasing Questions? 41 42
8 Plan Introduction of the semester Administrivia Iterated Function Systems (fractals) Administrivia Web: Lectures Slides will be online Office hours Posted on the web Review sessions C++, linear algebra Prerequisites Not enforced Linear Algebra Simple linear algebra, vectors, matrices, basis, solving systems of equations, inversion 6.046J Algorithms Orders of growth, bounds, sorting, trees C++ All assignments are in C++ Review/introductory session Monday 45 Grading policy Assignments: 40% Must be completed individually No late policy. Stamped by stellar. 2 Quizzes: 20% 1 hour in class Final project: 40% Groups of 3, single grade for the group Initial proposal: 35 pages Steady weekly progress Final report & presentation Overall technical merit 46 Assignments Turn in code AND executable We will watch code style Platform Windows Linux Collaboration policy: You can chat, but code on your own No late policy Project Groups of 3 Brainstorming Middle of the semester Proposal Weekly meeting with TAs Report & presentation 47 48
9 NonPhotorealistic Rendering Eric Ho Philip Lee Vivienne Lee Simulating a Starship Battle Christopher Taylor Benji Sterling Jon Wolk Bubble Trouble bobble 3D Challenge 3000 Roger Hanna Ryan Williams Chris Elledge Paul Elliott Selective Ray Recast For Optimized Rendering of Animation Bradley Lassey Ying Li Patrick Menard Questions Plan Introduction of the semester Administrivia Iterated Function Systems (fractals) 53 54
10 IFS: selfsimilar fractals Described by a set of n transformations fi Capture the selfsimilarity Affine transformations Contractions (reduce distances) An attractor is a fixed point 3 transforms Translation and scale by 0.5 A = U fi (A) Image from Rendering Probabilistic application of one transformation
11
12
13 Other IFS The Dragon 77 78
14 Application: fractal compression Exploit the selfsimilarity in an image E.g. Assignment: IFS Write a C++ IFS class Get familiar with vector and matrix library Image library Due Wednesday at 11:59pm Check on the web page Compressed using Fractal Photo Lab Review/introduction session: C++ Questions? Monday 7:
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