Shading processing device

Details Shading processing device Shading processing device

1997-08-28

2000-06-27

Powell, Mark R.

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

345431, 345432, 36471503, 382232, G06T 1560, G06K 946

Patent

active

060812745

ABSTRACT:
A light-source vector generating device obtains a normalized light-source vector of a point light source from light-source coordinates and polygon vertex coordinates. A diffuse reflection processing device obtains a first inner product of the normalized light-source vector calculated by the light-source vector generating device and a polygon normal vector. A specular reflection processing device obtains a light-source reflection vector from the normalized light-source vector and polygon normal vector, and obtains a second inner product of the light-source reflection vector and a sight-line (eye) vector. A color information generating device calculates polygon surface or polygon vertex color information, which has undergone shading processing, by multiplying the first inner product by diffuse reflection coefficients so as to obtain diffuse reflection light intensities and multiplying the second inner product by specular reflection coefficients so as to obtain specular reflection light intensities. The light-source vector generating device reduces the bit length of each value of the light-source vector before normalizing.

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