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Key Terms

  • Attenuation. Attenuation, or the natural decay of light from its source, is based on the inverse square law of physics. Light intensity diminishes based on the inverse of the square of the distance from the light source (the formula is 1/d2, or one over the distance squared).

  • Direct illumination. Direct light travels directly from the light source to a surface.

  • Indirect illumination. Indirect light is bounced from one surface to another.

  • Refine Iterations. This feature gathers radiosity energy from each face of an object and compares it with neighboring faces to smooth variations in lighting.

  • Filtering. This radiosity post process, in which the effect is applied after the initial rendering, blurs lighting variations across surfaces.

  • Reflectance. The percentage of light that bounces from a surface is the reflectance value of the material on the surface.

  • Color bleed. The amount of color carried from one surface to another accompanied by the reflectance values.


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