Polygon Mesh Generation for Sprite Rendering Efficiency
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Solution Overview
Problem
In computer graphics, rendering transparent pixels within a quad or convex hull consumes unnecessary resources, as these pixels do not contribute to the sprite image, leading to waste of finite fill rate in rendering hardware, especially when an alpha channel is involved.
Innovation Solution
Generating a polygon mesh by scanning image lines to identify pixel run lengths of interest, building rectangles based on these, and iteratively simplifying them to reduce the number of rectangles, ultimately creating a mesh that encompasses only visible pixels, thereby minimizing the number of transparent pixels rendered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a quad is used to render a sprite, then the sprite can be rendered onto the background, but transparent pixels are unnecessarily rendered consuming finite fill rate resources
Solution Approach 1:
The patent segments the quad into multiple convex polygons (convex hulls) that tightly enclose the visible pixels of the sprite. By dividing the original quad into smaller convex regions, the rendering system can exclude transparent pixels from each segment, thereby reducing overall fill rate consumption while maintaining complete sprite coverage.
Solution Approach 2:
The patent extracts and removes transparent pixels from the rendering process by generating convex hulls that precisely bound only the visible pixel regions. This extraction eliminates unnecessary transparent pixel rendering, freeing up fill rate resources for other rendering operations.
2Loss of energy
If a convex hull is generated to encapsulate sprite pixels, then the number of transparent pixels is reduced, but many transparent pixels may still be included
Solution Approach 1:
The patent applies segmentation by dividing the sprite into multiple convex hulls, each tightly enclosing a specific visible region. This segmentation allows precise control over which pixels are rendered in each convex region, minimizing transparent pixel inclusion while ensuring complete coverage of all visible sprite pixels.
Solution Approach 2:
The patent uses partial action by rendering only the necessary visible pixels within each convex hull rather than rendering the entire quad. By applying rendering operations selectively to each convex region containing only visible pixels, the system achieves precise pixel coverage without the excess transparent pixel rendering that would occur with a single large convex hull or full quad.
3Adaptability or versatility
If read-modify-write logic is required for every pixel within the quad due to alpha channel, then transparency can be handled, but resource consumption increases significantly
Solution Approach 1:
The patent extracts transparent pixels from the rendering pipeline by generating convex hulls that bound only visible pixel regions. This extraction eliminates the need to apply read-modify-write logic to transparent pixels, reducing processing resource consumption while maintaining full alpha channel functionality for the visible pixels that remain.
Data Source
AI summary
The present application relates to methods and systems for generating polygon meshes. One example of a method for generating a polygon mesh includes scanning a plurality of lines of an image to determine one or more pixel run lengths of interest, building a collection of rectangles based on the one or more pixel run lengths from the plurality of lines, and simplifying the collection of rectangles by combining rectangles with similar widths and/or heights.