研究目的
To develop and evaluate a technique for visualizing light properties (intensity, direction, diffuseness) as a tensor field in 3D scenes to aid lighting design and perception without the need for full renderings.
研究成果
The proposed visualizations (arrows, ellipsoids, tubes) effectively represent light properties and perform as well as or better than renderings in tasks involving light comparison and appearance inference. They provide a quick, intuitive tool for lighting artists to understand and manipulate light in scenes, potentially improving workflow efficiency. Future work could address higher-order light properties and real-time implementation.
研究不足
The visualization reduces light information to three properties, eliminating finer angular features (e.g., effects of multiple light sources). It does not fully predict specular reflections. The prototype is not real-time and requires manual adjustments for grid density and tube parameters. Performance may vary with scene complexity.
1：Experimental Design and Method Selection:
The study involved creating visualizations of light properties using arrows, ellipsoids, and tubes based on radiance measurements. A user study was conducted to compare the effectiveness of these visualizations against traditional renderings in tasks involving light property comparison and object appearance inference.
2：Sample Selection and Data Sources:
Three virtual room models were used, each illuminated in two ways, resulting in six scenes. Measurements were taken using a grid of sensors in Autodesk 3ds Max's Lighting Analysis Assistant tool.
3：List of Experimental Equipment and Materials:
Software: Autodesk 3ds Max with mental ray renderer, Lighting Analysis Assistant tool. Hardware: Computer systems for rendering and visualization.
4：Experimental Procedures and Operational Workflow:
Sensors were placed in a grid within the scene volume. Measurements of illuminance were exported and processed to calculate light properties (intensity, direction, diffuseness) using Cuttle's formulas. Visualizations (arrows, ellipsoids, tubes) were generated and imported back into 3ds Max for display in the viewport.
5：Data Analysis Methods:
A user study with 14 participants performed tasks to compare light properties and infer object appearances. Performance was measured by the percentage of correct answers, and statistical analysis (z-tests, confidence intervals) was used to compare results between visualization types and renderings.
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