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Advanced Driver Assistance Systems (ADAS) in modern cars contain actively reacting functionality, like autonomous steering or braking assistants. The demand for functional Hardware-in-the-Loop (HiL) testing of these systems contains the need to create realistic models of the car's surrounding. Generating high-resolution photorealistic 3D-graphics in real-time proved to be critical, but with modern graphics technology, “Visual Loop” test-systems can be built. Integrated into test processes and with automated test case generation, these testing tools can improve the performance and quality of functional verification and validation significantly.