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Method system and computer program product for shading

  • US 5,880,736 A
  • Filed: 06/20/1997
  • Issued: 03/09/1999
  • Est. Priority Date: 02/28/1997
  • Status: Expired due to Term
First Claim
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1. A method for shading a computer graphics image, the computer graphics image including an object surface, comprising the steps of:

  • building an object space transform matrix that defines a transformation from eye space to object space;

    transforming a shading vector defined at a point in eye space into object space defined by said object space transform matrix to form a corresponding object space shading vector;

    performing a vector operation between said object space shading vector and a perturbed normal in object space at said point; and

    computing a shading value for said point based on said vector operation performed in said performing step;

    whereby, said shading value can be mapped to a pixel to shade the object surface.

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