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专利名称：Method and apparatus for providing shading
in a graphic display system
发明人：David J. Collodi申请号：US10669237申请日：20030923公开号：US06833830B2公开日：20041221
专利附图：
摘要：A method and apparatus for shading polygons in a graphics rendering system isprovided. The method includes the step of providing, for each polygon to be shaded, apolygon coordinate system defined by three normalized vectors which represent the X, Y
and Z axes. A light source defining a three dimensional light direction vector is furtherprovided. The three dimensional light vector is rotated to correspond with the polygondirection vector. The rotated three dimensional light vector is converted into a twodimensional vector whose length is proportional to the angle between the polygon Zvector and the light direction vector. Another aspect of the present invention involves theinterpolation of two dimensional vertex angle values, provided for each of the polygon'svertices, at each drawn pixel within the polygon surface. A bump map vector value isadded to the interpolated vertex value forming a two dimensional composite surfaceangle vector. Light coefficients are then derived from the distance between thecomposite surface angle vector and the two dimensional light vectors.
申请人：COLLODI DAVID J.
代理机构：Brinks Hofer Gilson & Lione
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