Simulating Headlamp Illumination Using Photometric Light Clusters
2009-01-0110 Simulating Headlamp Illumination Using Photometric Light Clusters William T.C. Neale, David R. Hessel Kineticorp, LLC Copyright © 2009 SAE International ABSTRACT which and the degree to which something is visible. Current methods exist fore evaluating the limits of Assessing the ability of a driver to see objects, visibility which rely on replicating as closely as possible pedestrians, or other vehicles at night is a necessary the conditions present at the time of the accident and precursor to determining if that driver could have performing an in situ evaluation, through observation avoided a nighttime crash. The visibility of an object at and light measurement (Adrian, 1998, pp. 181-88; Klein, night is largely due to the luminance contrast between 1992; Owens, 1989). the object and its background. This difference depends on many factors, one of which is the amount of However, replicating the lighting conditions under which illumination produced by a vehicle’s headlamps. This an accident occurred can be difficult and expensive and paper focuses on a method for digitally modeling a may be impossible if the accident site no longer exists or vehicle headlamp, such that the illumination produced by has changed significantly. If one were able to digitally the headlamps can be evaluated. The paper introduces simulate the accident environment these constraints the underlying concepts and a methodology for could, in many cases, be eliminated. However, creating simulating, in a computer environment, a high-beam a simulated environment would have its own obstacles, headlamp using a computer generated light cluster. In including the need to accurately model the various light addition, the results of using this methodology are sources in that environment.
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