The Advanced Visual Technology System (AVTS) computer image generator was modified to produce highly accurate simulations of Synthetic Aperture Radar (SAR) reflectivity and elevation effects that can be precisely correlated with corresponding visual and infrared, imagery. The resulting SAR snapshot is a plan view of the selected patch area, with the field-of-view corresponding to the selected scale - .65, 1.3, or 2.6 nm. The image generator is interrupted for only one frame time, during which the entire processing power of the AVTS is brought to bear on the SAR snapshot; i.e., up to 4000 polygons. Once the SAR patch is computed, the AVTS continues with visual and infrared processing. A post-processor then adds interpatch and intrapatch shadows, horizontal and vertical incidence effects, resolution fall-off in azimuth and range, and speckle. This system is presently being used to help determine requirements for simulated SAR data bases.