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CMSC 427: Computer Graphics

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  1. CMSC 427: Computer Graphics David Jacobs

  2. Today’s Class • Whirlwind intro to graphics • What problems does graphics deal with? • Examples of leading edge work. • Applications • What we’ll cover • Fundamental issues underlying these. • Class structure and logistics

  3. Computer Graphics: Possible Definitions • Using computers to create images? • Creating realistic images of the world • Also creating semi-realistic images • Information visualization

  4. Realistic Images • Geometry • Lighting/Intensities • Motion

  5. Geometry • 3D Models • Projection • Visibility

  6. 3D Models - Scanning (http://graphics.stanford.edu/projects/mich/).

  7. Scanned Model On the left is a photograph of Michelangelo's David. On the right is a computer rendering made from a geometric model. (http://graphics.stanford.edu/projects/mich/).

  8. 3D models - Generated Realistic modeling and rendering of plant ecosystems: Oliver Deussen1 Pat Hanrahan2 Bernd Lintermann3 Radom´ır Mˇech4 Matt Pharr2 Przemyslaw Prusinkiewicz4 http://graphics.stanford.edu/papers/ecosys/ecosys.pdf

  9. Geometry – Projection, Visibility The Walkthru Project http://www.cs.unc.edu/~walk/

  10. Lighting • Modeling Lighting • Reflectance • Texture • Shadows (visibility) • Interreflections

  11. Lighting (from Debevec)

  12. Light Source emits photons And then some reach the eye/camera. Photons travel in a straight line • When they hit an object they: • bounce off in a new direction • or are absorbed • (exceptions later).

  13. BRDF

  14. Measuring BRDF

  15. Skin Reflectance BRDF BSSRDF http://graphics.stanford.edu/papers/bssrdf/ (Jensen, Marschner, Levoy, Hanrahan)

  16. Hair http://graphics.stanford.edu/papers/hair/hair-sg03final.pdf

  17. Texture Photo Pattern Repeated

  18. Texture Photo Computer Generated

  19. Shadows (from Langer and Zucker)

  20. Interreflections Falling Water model, Bruce Walter thesis. http://www.graphics.cornell.edu/%7Ebjw/bwthesis.pdf

  21. Motion Capture http://mocap.cs.cmu.edu/search.php?subjectnumber=%&motion=%

  22. (Terzopoulos)

  23. (Terzopoulos)

  24. Physically real motion

  25. Images based on realism (De Carlo and Santella)

  26. Visualization – Pre-graphics

  27. Membrane Ion Channels Picture Omitted Nicotinic Acetylcholine Receptor in Membrane mimetic Slab (77K atoms) (Prof. Varshney)

  28. Modern Applications(slides courtesy of Prof. Varshney) • Computer-Aided Design/Manufacturing • Medicine • Biochemistry • Simulation • Cartography • Electronic publishing • Computer Animation / Film Production • Art • Games

  29. Computer-Aided Design Picture Omitted Virtual Car Images courtesy Mercedes-Benz

  30. Drug Design Picture Omitted Complementarity of Transthyretin Domains

  31. Architectural Walkthroughs Picture Omitted Image Courtesy Lightscape

  32. Medical Imaging Picture Omitted CT Volume Rendering Image courtesy: GE CRD Labs Volume Rendering with Reflections Image courtesy: Arie Kaufman, SUNY SB

  33. Computational Simulations Picture Omitted Flow Fields for Space Shuttle Launch Vehicle Image Courtesy: Fred Martin et al., NASA Johnson Space Center

  34. Film Production Picture Omitted Finding Nemo, Pixar Animation Studios

  35. Computer Games Picture Omitted

  36. What we’ll learn • Fundamental principles/math • Geometry • Reflectance modeling • Algorithms • Programming – C++, OpenGL, GLUT

  37. Introduction • Graphics displays and Open GL • Geometric Objects • Geometric Transformations • Projection • Display – Scan Conversion • Texture • Color and Transparency • Sampling and Filtering • Midterm • Midterm recap • Culling, Depth cues and Collisions • Visibility Determination • Illumination, Shading • Ray Tracing • Shadows • Global Illumination • Modeling • Interpolation and approximation • Rendering • Image-Based Rendering • Animation • Conclusions Outline

  38. Text • Required: Computer Graphics with OpenGL, Third Edition by Donald Hearn and M. Pauline Baker ISBN 0-13-015390-7, Prentice Hall • Recommended: OpenGL 1.4 Programming Guide, Fourth Edition: The Official Guide to Learning OpenGL, Version 1.4 by OpenGL Architecture Review Board, Dave Shreiner, Mason Woo, Jackie Neider, Tom Davis ISBN 0-321-17348-1, Addison-Wesley You can download OpenGL 1.1 Programming Guide

  39. Course Requirements • Prerequisites • Linear Algebra • CMSC 420 (programming experience) • Assignments • Reading (Today, Chapter 1, Tuesday, Chapter 2) • Problem Sets (5) • Programming in OpenGL • Pencil and paper problems. • Challenge problems • Midterm, final

  40. Logistics • Questions: WebCT • Teacher–David Jacobs djacobs@cs.umd.edu • Office hours, Tu, W 2-3 • TA – Derek Juba juba@cs.umd.edu • Office hours, M 2:30-3:30, Th 12:30-1:30 • Assignments • Handing in - WebCT • Late policy - Homework due start of class.   Due Thursday, late penalty of 10% if 24 hours late.  30% penalty if 11am next Monday. Not accepted later. Due Tuesday, late penalty 10% for 24 hours, 20% for 48 hours, no later.