Components of SPIRITS Surface BRDF 3D Geometry Temperatures •  Convection •  Conduction to non- equilibrium interior •  Radiative exchange •  Hot engine regions •  Internal heat sources and sinks •  Aerodynamic effects •  Hierarchical •  User-movable parts (wing flaps, doors, nozzles) •  Energy-conserving •  Non-Lambertian emittance •  Non-Lambertian diffuse and specular reflectance •  Spectral variation •  Engine cycle database •  Correction for ambient temperature •  Nozzle mixing •  External flow using SPF-II •  Spectral/spatial radiance and transmittance using SIRRM-II Exhaust Plumes Environment •  Spectral sun, earth, sky, clouds •  Atmospheric radiance/ transmission using MODTRAN Outputs •  In-band radiance images •  Spectral and in- band radiant intensities •  Areas •  Specialized output for post- processing Scene Rendering •  Fully spectral •  Integrated body/plume •  Transmission through multiple plume/body layers •  Secondary reflections •  Variable spectral resolution To SPIRITS Page