CS 445: Topics for Oct 23/25/27, 2017

• Labs:
  • Complete: Lab 6: Fractal Landscape
  • Begin: Lab 7: Textures

• Texels: A texel, or texture element (also texture pixel) is the fundamental unit of texture space.

• Mapping coordinates: texture (s,t) vs parameterized (u,v) vs world (x,y,z) vs screen (x_s, y_s).

  • Mappings
  • Texture - Object - Screen coordinates
  • Types of Projections
  • See texture tutor in Nate Robbin's openl tutors

• Aliasing

  • Hypergraph - aliasing and anti-aliasing Aliasing issues in textures..
  • mipmapping : multum in parvo (many things in a small place)
    • Quick Graphic: Minification vs Magnification
    • More details: minification, magnification (ppt) or see pdf

• Look at Maya.

• Implementation in WebGL - Texture coordinates, parameters, etc (see Lab 7)

• Other types of maps

  • Environment Mapping
  • CubeMap Example
  • Bump Mapping, normals

• Blending and transparency with the alpha component.

  • Recall what the z-buffer is and why it is used.
  • Transparency is difficult to implement correctly: See blending.
  • How does the "discard()" function work in a programmable shader and why is it not possible to get the same effect in fixed pipeline.
  • Implementing shadows

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