Invalidity dossier
US 6057848
System for rendering high order rational surface patches
Current assignee: Avago Technologies International Sales Pte Ltd
Added 9/23/2026, 12:17:06 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
US 6057848 A — "System for rendering high order rational surface patches"
Inventor: Vineet Goel. Original assignee: LSI Logic Corp. (current assignee listed as Avago Technologies International Sales Pte Ltd). Priority date assumed 1997-04-08; filed 1997-08-27; granted/published 2000-05-02; status "Expired – Lifetime," with anticipated expiration 2017-04-08. Classifications include G06T17/00, G06T17/20 (tessellation), and G06T15/04 (texture mapping). Source: https://patents.google.com/patent/US6057848/en
Purpose. The invention addresses converting object representations into images for graphical display, specifically rendering a surface represented by a set of Bezier patches. The text explains that Bezier patch representation gives compact, high-quality object representation and efficient execution of affine transformations, and that it is desirable to convert Bezier patches into triangles or other polygons for established graphics rendering hardware.
Plain-language scope. According to the supplied text, the patch rendering system receives rational coordinates (X,Y,Z,W) and attribute coordinates (color, opacity, texture) of control points; divides and subdivides the surface patch by operating on control points to produce subpatch control points; converts rational coordinates to spatial coordinates; and, if a current subpatch is flat, provides spatial coordinates and attributes of subpatch corner points to an output buffer as triangle vertices with associated attributes.
The contemplated patch tessellation device comprises a patch buffer (receives/stores rational coordinates of current control points), a patch division unit (calculates rational coordinates of new control points), a homogeneous coordinate unit (converts rational to spatial coordinates), and a corner unit (provides corner-point spatial coordinates as triangle vertices to an output buffer if the new subpatch is classified as flat). It may also operate on Bezier patches specifying surface attributes.
Not established by this excerpt. The excerpt is partial: claim text, the complete detailed description, figures, and references are omitted, so actual claim scope, dependencies, and limitations cannot be verified. It also does not establish litigation, validity, enforceability, or prior art; and the dates, assignee, and legal status are stated by the source as assumptions or listings, not legal conclusions.
Generated 10/1/2026, 9:53:42 PM
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Assignment history
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Prior art
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