Lighting Solver Illumination Map for 3D Environments
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Solution Overview
Problem
Existing methods for rendering large 3D outdoor environments with realistic illumination and shadows are computationally intensive, especially due to the complexity of direct illumination and shadowing effects, which scale poorly with the size of the environment.
Innovation Solution
A Lighting Solver generates an Illumination Map using a raster elevation map, which is updated at paging rates to efficiently handle changing illumination and movement, allowing for per-texel lighting and efficient shadow computation, particularly using a parallel light source ray-casting algorithm for dynamic shadows over large areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If ray tracing algorithms are used to trace photon paths for realistic illumination, then illumination realism is improved, but computational complexity increases significantly
Solution Approach 1:
The patent segments the large 3D environment into multiple tiles or sectors, processing illumination and shadow calculations for each segment independently. This divides the computationally intensive ray tracing problem into smaller, manageable pieces that can be processed in parallel, reducing overall computational complexity while maintaining illumination realism.
Solution Approach 2:
The patent pre-calculates and stores illumination maps and shadow information for different regions of the environment before rendering. By performing preliminary illumination calculations and caching results, the system avoids redundant ray tracing computations during real-time rendering, significantly reducing computational complexity while preserving realistic illumination effects.
2Manufacturing precision
If shadowing calculations are performed for each point in the scene, then shadow accuracy is improved, but processing time increases
Solution Approach 1:
The patent merges shadow calculations by computing illumination and shadow information together in integrated illumination maps rather than separately for each point. This combining of operations reduces redundant computations and processing time while maintaining shadow accuracy through the unified calculation approach.
Solution Approach 2:
The patent uses pre-computed illumination maps and shadow tables that are copied and applied to multiple points in the scene. Instead of performing full shadow calculations for every point, the system replicates pre-calculated shadow information across relevant areas, significantly reducing processing time while preserving shadow accuracy through the use of high-resolution pre-computed data.
3Productivity
If the environment is divided into smaller processing regions, then computational efficiency is improved, but data management complexity increases
Solution Approach 1:
The patent implements a hierarchical data structure where illumination maps and shadow information are organized in nested levels of detail. Coarse-level illumination data provides overall lighting context, while finer-level details are stored only where needed. This nesting allows efficient processing of large environments by managing data at multiple scales, improving computational efficiency while keeping data management tractable through the hierarchical organization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables high-fidelity illumination and shadowing over large 3D environments at real-time rates, reducing unnecessary computational rework and improving rendering efficiency by leveraging paging mechanisms and parallel processing.
Implementation Method 1
A Lighting Solver generates an Illumination Map using a raster elevation map... particularly using a parallel light source ray-casting algorithm for dynamic shadows over large areas
Data Source
AI summary
Efficient determination of illumination over large 3D environments, including shadowing, is provided. Illumination, including shadows, is generated using a raster elevation map by a lighting solver. The lighting solver fetches the raster elevation map for an illumination area of interest at the paging rate and produces an illumination map that is applied to terrain and features by a 3D renderer. The lighting solver updates subsets of the illumination map as necessary to reflect changing illumination or movement of the visual area of interest.