The combination of contractive solid geometry (CSG) and ray casting provides a number of advantages for modeling target signatures obtained using active laser radar systems. These include ease of modeling complex targets and a methodology well-suited for the incorporation of most important laser radar phenomenology. For applications requiring image understanding or discrimination, the use of multiple types of sensors may be required. Fusion of information from several types of sensor may provide discrimination or identification capability not achievable using a single sensor. Sensor fusion studies require a consistent set of signatures for a given target, and such sets are not currently available from measurements. The use of separately simulated signatures generated using different target models may introduce artificial signature differences due to differences in the target model which would not be present in measurements made with real systems. Our approach has been to retain the advantages of the ray casting and CSG approach, which is well-suited to active systems, and to make use of mapping techniques to include the effects of surface temperature and emissivity variations, permitting the calculation of infrared signatures. This paper discusses high-resolution signature generation for both active and passive scenes. Phenomenology addressed includes the illumination beam profile, material bidirectional reflectance effects, glint insertion, and bistatic illumination for active images, and incorporation of temperature and emissivity information for passive scenes. Simula-tion of receiver optics and detector effects are discussed for both types of sensors. In the final section, examples of multimode imagery will be presented.