Feasibility has been demonstrated for a hybrid simulation approach which merges two technologies, Computer Generated Imagery (CGI) and Computer Synthesized Imagery (CSI), to form Computer Generated Synthesized Imagery (CGSI). This approach holds promise as a cost-effective, attainable method of providing real-time, high detail imagery for visual and/or other sensors, such as FLIR. A videotape for a nap-of-the-earth flight was generated, demonstrating the fidelity and mobility that can be achieved using this CGSI hybrid approach. A description of the approach will be provided along with selected video frames. Critical features which were demonstrated include: merging of the two technologies, vertical movement for target acquisition and landing, horizontal movement towards and away from objects, dynamic occulting of 3-D objects, dynamic smoke and dust, and color visual and IR imagery.