Light Source Grid Rendering for Noise-Free Direct Illumination
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Solution Overview
Problem
Existing illumination rendering technologies suffer from poor image quality due to unwanted noise in rendered images, particularly when indirect illumination is used for objects with self-luminous materials.
Innovation Solution
An image rendering method that utilizes a custom grid light source shading model to convert object grids with light source materials into light source grids, enabling direct illumination rendering and fusing the results to improve image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If indirect illumination is used for self-luminous materials, then the object can be illuminated in the scene, but the rendered image contains unwanted noise and has lower image quality
Solution Approach 1:
The patent segments the illumination calculation into two independent parts: direct illumination calculation (light source to pixel) and indirect illumination calculation (reflected light to object surface). This segmentation allows each part to be optimized separately, with direct illumination using light source grids for high accuracy and indirect illumination handling the remaining lighting effects, thereby eliminating noise while maintaining rendering quality
Solution Approach 2:
The patent introduces light source grids as an intermediary structure that represents the light emitting surface. Instead of directly calculating complex indirect illumination paths, the light source grid serves as a mediator to compute direct illumination contributions, simplifying the calculation process and eliminating noise in the rendered image
2Adaptability or versatility
If indirect illumination is used to determine reflected light hits, then the self-luminous material influence can be calculated, but the rendering result comes with noise and lower quality
Solution Approach 1:
The patent divides the illumination calculation into direct and indirect components. The direct illumination component uses light source grids to calculate the influence of self-luminous materials directly, while the indirect illumination component handles reflected light. This segmentation enables accurate calculation of self-luminous material influence without the noise associated with indirect illumination methods
Solution Approach 2:
The patent replaces the traditional indirect illumination calculation mechanism with a light source grid-based direct illumination approach. This substitution transforms the complex indirect lighting calculation into a more efficient direct calculation system, improving image quality while maintaining the ability to calculate illumination contributions
Data Source
AI summary
An image rendering method includes: acquiring a project scene, materials of an object in the project scene including a light source material, and the light source material being a material that is endowed with a light source attribute by setting a corresponding shading model to be a custom grid light source shading model; searching object grids with the light source material from the project scene, and performing light source structure conversion on the object grids with the light source material to obtain light source grids, the object grids being grids used for forming the object in the project scene; and using each of the light source grids as a light source, to perform direct illumination rendering on each of pixels of the image representing the project scene, and fusing a direct illumination rendering result of each of the light source grids for each of the pixels to obtain a rendered target image.