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Generate a 4K PBR texture set for the provided 3D car model, simulating realistic rust and weathering from long-term abandonment and recent survival-mode use. Preserve the original UV mapping exactly—no changes or re-unwrapping. Focus on authentic decay: oxidized metal, chipped paint, dust buildup, dry mud, and moss in crevices. Rust should appear around bolts, seams, wheel arches, and undercarriage, guided by curvature and AO maps. Include sun-faded panels, scratches, and worn rubber. Important: keep the roof clean and untouched with a plain, uniform texture—no rust, dirt, or weathering. Final result should evoke gritty, post-apocalyptic realism.