Wilson, Mark A (mark.a.wilson++at++lmco.com)
Wed, 28 Oct 1998 07:58:31 -0500
What you use depends on your requirements. For the IR world, those
requirements should address bands, reflective energy (including specular
reflections), emissive energy (both passive and dynamic) and attenuation
(natural and artificial). Delving deeper into any one of those areas would
require a book. Your requirements should also address the intended use. Are
you simply developing a reasonable scene to "fool" a human operator? Or are
you injecting or projecting sensor imagery for hardware in the loop
simulation? Clearly the former requires only a simple solution while any
solution for the later will require the best that you can produce, and that
will be a compromise.
There are a number of solutions covering a wide range of cost/performance
options. High fidelity, multi-platform solutions are custom built. Amherst
out of New York uses a pricey hybrid (hardware and software) system to
produce scenes with reasonably good fidelity in realtime. MultiGen/Paradigm
offers a software solution originally developed by Photon Research. IRGen
produces a color look-up table based on a given ground truth. None of the
commercial solutions can be considered cheap.
All of the commercially available solutions essentially address imagery on a
face basis. That approach required highly detailed models including, in some
instances, internal details as well. Detailed geometry is an anathema to
realtime image generation. You could produce a texture outside of realtime
for a given ground truth then apply it to a realtime model but, that would
only apply to a single ground truth. The process of selecting a method is a
tradeoff. How much realism you you need? And, how much can you afford?
I don't think I want to get started on the underlying math models involved
(again, another book).
Mark A. Wilson
Advanced Simulation Laboratory
Lockheed Martin Electronics and Missiles
e-mail: mark.a.wilson++at++lmco.com
voice: (407)356-6387 fax: (407)356-9302
> -----Original Message-----
> From: missdbng++at++blr.vsnl.net.in [SMTP:missdbng++at++blr.vsnl.net.in]
> Sent: Wednesday, October 28, 1998 2:24 AM
> To: info-performer++at++sgi.com
> Subject: IR scenes
>
>
> Dear performers,
> How do we make a visual database IR compatible? Using a modelling tool
> like MultiGen, is there a way to assign IR properties to polygon, which
> will behaviour built in? Any one tried any other methods?
> Thanks!!!
> Balaji
>
>
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