CS 445: Topics for Oct 28/30, 2014

• Labs:
  • Lab 5: Lighting & Shaders - Due Tuesday, Nov 4

• Fractal Terrains:

  • Google images for fractal landscapes.
  • Digital Elevation Models (DEMs), USGS National Elevation Dataset and height maps
  • Diamond Square Algorithm

• Review from last week: Projection and viewport transformations.

• How do you set the light location?

• How do Normals transform? When do we need to be careful?

• Continue discussion of Shaders:

  • Shaders and the openGL pipeline.
  • Communication between openGL and GLSL.
  • Overview of GLSL language - See the following:
    • Quick Reference Card (starting on p. 6). Note, items in blue have been removed from the core profile.
    • Chapter 5 Bailey (gorr-classes)
    • Your textbook, starting on p. 37
  • Implementing the Phong Lighting Model in the vertex shader. (Gouraud Shading)
  • Implementing the Phong Lighting Model in the fragment shader. (Phong Shading)
  • Implementing a color map in the shader - you need this for coloring the fractal labdscape. Two GLSL functions that are useful are:
    • smoothstep
    • mix

  

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