lighting shading

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“Everything we know is only some kind of approximation.” - Richard Feynman.

Illumination(物理学范畴)

The transport of energy from light sources to surfaces & points

  • Category
    • direct vs indirect
    • empirical vs physically based
    • local vs global
  • Two components
    • light source
      • propertices
        • color
        • position
        • direction
        • shape
        • attenuation
      • light type
        • ambient light sources
        • directional light sources
        • point light sources
        • pot light rsources
        • area light sources
    • surface properties
      • color
      • position
      • orientation
      • micro-structure
Lighting(物理学范畴)

The process of computing the luminous intensity at a particular 3-D point, usually on a surface.
Interaction between materials and light sources.

Category

  • Lambert lighting
  • Phone lighting
    • empiracal ,include there components:ambient、 diffuse、specular
  • Blinn Phone
Shading(图形学范畴)

The process of assigning colors to pixels. Which determines the color of a pixel.

Category

  • Flat shading

    Calculates illumination at a single point for each polygon

  • Gouraud shading
    The normal vector at vertex V is calculated as the average of the surface normals for each polygon sharing that vertex

  • Phone shading
    linearly interpolating the surface normal across the facet, applying the Phong lighting model at every pixel

参考链接

https://web.csl.cornell.edu/courses/cs5620/lectures/05_Illumination_and_Shading.pdf

http://cs.boisestate.edu/~alark/cs464/lectures/Shading.pdf

http://web.cse.ohio-state.edu/~shen.94/581/Site/Slides_files/illumination.pdf