Perspective-Correct Vector Graphics Rendering for Sharp HMD Edges
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Solution Overview
Problem
Existing rendering techniques for vector graphics in 3D environments consume excessive CPU and GPU resources and result in blurry edges when scaled, particularly in devices like HMDs.
Innovation Solution
A pre-processing stage divides a 2D canvas into regions, identifying relevant vector graphic portions for each region, allowing the GPU to efficiently render pixels by assessing only these portions, reducing the number of curves used and minimizing unnecessary computations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing techniques render vector graphics using full GPU processing, then rendering completeness is achieved, but computational resources and processing time are excessively consumed
Solution Approach 1:
The patent segments the 2D canvas into multiple regions (tiles) and segments the vector graphic paths into portions that intersect with these regions. This segmentation allows the GPU to process only the relevant portions of vector graphics for each region, significantly reducing computational resources while maintaining rendering completeness.
Solution Approach 2:
Instead of processing the entire vector graphic, the patent applies partial action by processing only the portions of paths that are relevant to each specific region. This selective processing approach reduces computational overhead while maintaining sufficient rendering quality for the displayed region.
2Adaptability or versatility
If fixed-resolution images are used for text and graphics, then rendering simplicity is maintained, but image quality deteriorates when enlarged or reduced
Solution Approach 1:
The patent changes the fundamental parameter of graphic representation from fixed-resolution pixel-based to vector-based mathematical definitions. This allows the graphics to be rendered at any resolution and scale without quality loss, as the vector paths are recalculated rather than simply scaled pixels.
3Measurement precision
If all vector graphic portions are processed for each pixel, then rendering accuracy is maintained, but processing time increases significantly
Solution Approach 1:
The patent segments both the canvas into regions and the vector paths into relevant portions. For each pixel, only the path portions that intersect with the pixel's region are processed, dramatically reducing processing time while maintaining rendering accuracy for the displayed region.
Solution Approach 2:
The patent performs preliminary action by pre-determining which path portions are relevant to each region before actual rendering. This pre-computation of relevance information allows the rendering process to skip unnecessary path evaluations, significantly reducing processing time.
Data Source
AI summary
Various implementations disclosed herein include devices, systems, and methods that render perspective correct 2D graphics (e.g., virtual objects, text, graphics) correctly at any angle and distance in an electronic device such as an HMD. In some implementations, a vector graphic including portions defined on a 2D canvas is obtained and the 2D canvas is divided into separate regions, each region containing a plurality of pixels. In some implementations, data based on associating a plurality of the regions of the 2D canvas with the portions of the vector graphic is generated, the data identifying one or more contributing portions of the portions of the vector graphic to use in rendering the pixels in each of the plurality of regions of the 2D canvas. In some implementations, the data is provided to a processor for rendering the vector graphic.