Simulation of curved surface reflectance in the quick image display (QUID) model

Robert L. Sundberg

doi:10.1117/12.352912

19 July 1999 Simulation of curved surface reflectance in the quick image display (QUID) model

Robert L. Sundberg

Author Affiliations +

Proceedings Volume 3697, Technologies for Synthetic Environments: Hardware-in-the-Loop Testing IV; (1999) https://doi.org/10.1117/12.352912
Event: AeroSense '99, 1999, Orlando, FL, United States

Abstract

The Quick Image Display (QUID) model accurately computes and displays radiance images at animation rates while the target undergoes unrestricted flight or motion. QUID uses a novel formulation for reflective/emissive terms which enables rapid and accurate target image rendering. The fundamental quantity which enters into the determination of reflected radiation is the bi-directional reflectance distribution function (BRDF). QUID's BRDF formulation involves decomposition of the BRDF into a generalized sum of product terms. Each product term is factored into separable spectral and angular functions. The spectral terms can be pre- calculated for the user specified bandpass and for a set of target observer ranges. The only BRDF calculations which must be performed during the simulation involves the observer-target-source angular functions which change with target orientation. Reflected solar radiation can dominate the apparent target signature of aircraft in daytime scenes in the MWIR/SWIR spectral regions. To accurately simulate reflections from curved surfaces either a large number of small flat facets must be used or some type of pseudo curvature technique. Both of these approaches tend to significantly slow down scene rendering. The main thrust of this effort is to find rapid techniques for accurate specular glint rendering on curved surfaces.

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Robert L. Sundberg "Simulation of curved surface reflectance in the quick image display (QUID) model", Proc. SPIE 3697, Technologies for Synthetic Environments: Hardware-in-the-Loop Testing IV, (19 July 1999); https://doi.org/10.1117/12.352912

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KEYWORDS

Bidirectional reflectance transmission function

Reflectivity

3D modeling

Solar radiation models

Solids

Image display

OpenGL

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