Infrared smoke modelling in CounterSim

Roy Walmsley; Brian Butters

doi:10.1117/12.737376

10 October 2007 Infrared smoke modelling in CounterSim

Roy Walmsley, Brian Butters

Proceedings Volume 6738, Technologies for Optical Countermeasures IV; 67380P (2007) https://doi.org/10.1117/12.737376
Event: Optics/Photonics in Security and Defence, 2007, Florence, Italy

Abstract

With the ever-growing demand for increased realism in defence modelling and simulation, smoke modelling, which is computationally expensive, must be conducted on graphics hardware to enable execution at fast rates with good fidelity. Visual smoke simulation has been successfully implemented by many authors over recent years, but infrared smoke modelling adds new requirements with additional challenges. This paper discusses the introduction of a Navier-Stokes staggered grid model into CounterSim, our countermeasures simulation software, highlighting the problems and benefits of using PC commodity graphics hardware for infrared applications and detailing the methodology used to control mass loss and to model thermal cooling. Additionally, the need to use an adaptive grid is explained, with the implications for both the simulation equations and the management of data storage, particularly when mixtures of smoke products with widely differing properties may be present. The focus is then shifted to rendering, highlighting the requirements for greater accuracy than the standard eight bits per channel of visual applications. Problems with alpha blending on graphics hardware are also discussed, and examples are presented that illustrate how changes in pixel format give rise to sometimes startlingly different end results.

Citation Download Citation

Roy Walmsley and Brian Butters "Infrared smoke modelling in CounterSim", Proc. SPIE 6738, Technologies for Optical Countermeasures IV, 67380P (10 October 2007); https://doi.org/10.1117/12.737376

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