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CIS 115

Lecture 19: Computer Graphics

Steve Russell & PDP-1

Image Source: Wikipedia

Spacewar!

Image Source: Wikipedia

Animations

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Cathode Ray Tube (CRT)

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René Descartes

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Cartesian Coordinates

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Display Coordinates

Pixel

Image Source: Wikipedia

3D Graphics

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Wireframe

Edges

  1. 1 → 2
  2. 2 → 3
  3. 3 → 4
  4. 4 → 1
  5. 5 → 2
  6. 6 → 7
  7. 7 → 8
  8. 8 → 5
  9. 1 → 5
  10. 2 → 6
  11. 3 → 7
  12. 4 → 8

Vertices

  1. 1,1,1
  2. 1,-1,1
  3. -1,-1,1
  4. -1,1,1
  5. 1,1,-1
  6. 1,-1,-1
  7. -1,1,-1
  8. -1,-1,-1

Wireframe

Suzanne

Image Source: Wikipedia

Perspective Projection

Image Source: Wikipedia

Perspective Projection

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Ray Tracing

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Ray Tracing

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Shader

Image Source: Wikipedia

Image Source: Romain Vergne

Graphics Processor

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Mapping 1 - Textures

Apply details to simple structures

Image Source: Eduard Groller & Stephan Jeschke

Mapping 2 - Shadows

Image Source: Wikipedia

Mapping 3 - Reflections

Image Source: Wikipedia

Mapping 4 - Transparency

Screendoor or Alpha Blending

Image Source: TU Wien and Stack Overflow

Mapping 5 - Bump Mapping

Image Source: Wikipedia

Mapping 6 - Displacement Mapping

Image Source: Wikipedia

Computer Animation

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Uncanny Valley

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Voxel

Image Source: Wikipedia

Voxel Example

Image Source: Wikipedia

Minecraft

Image Source: Wikipedia

Assignments

Blog 9: Computer Graphics Overload

Mainstream media is infatuated with computer graphics. Blockbuster movies, triple-A video games, and even local news programs make great use (or even overuse) of the latest advances in computer graphics. Choose your favorite medium or genre, and write about how computer graphics have changed things in the last 50 year. Show us some examples of what it was like before computer graphics were the norm, and then illustrate the progression from then to now. Feel free to be creative and include pictures or video to illustrate your examples.

Drawing in Scratch

Scratch Spirograph

Image Source: Wikipedia

Spirograph Math

Image Source: Wikipedia

Spirograph Math