Anisotropic texture mapping using silhouette/footprint...

G - Physics – 06 – F

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G06F 3/14 (2006.01) G06T 15/00 (2006.01) G06T 15/20 (2006.01)

Patent

CA 2254666

Anisotropically mapping of texture information to each pixel required for display of each of plural. polygons forming each scene on a CIG display in a computational efficient manner, uses the footprint of each transformed pixel silhouette, as mapped from image space into the texture array, to determine an anisotropic texture space area having both a related length and a related width, in which complete texels and texels fractions are covered by that pixel footprint. A set of un-normalized line equations characterizing a particular pixel footprint is used to determine whether each texel or subtexel in the vicinity of that pixel footprint is either enclosed or avoided by (i.e. inside or outside of) that projected pixel footprint.

Méthode de mappage anisotrope de données sur la texture de chaque pixel nécessaire à l'affichage de polygones formant fidèlement des images informatiques sur un écran d'imagerie numérique. La méthode utilise l'empreinte de chaque silhouette de pixel transformé, mappée à partir de l'espace image dans le réseau de textures, afin d'établir une zone de texture anisotrope de longueur et de largeur correspondantes dans laquelle des texels complets et partiels sont recouverts de l'empreinte des pixels. Un ensemble d'équations linéaires dénormalisées caractérisant une empreinte de pixel précise sert à déterminer si chaque texel ou sous-texel près de l'empreinte de pixel est enfermé ou séparé par l'empreinte (c.-à-d. à l'intérieur ou à l'extérieur de l'empreinte).

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