Generate a hyper-detailed 3D model of a biomechanical femur. The femur should have a realistic, weathered bone texture with fine cracks and surface roughness. Large metallic plates are bolted onto the bone, with visible screws and a brushed metal finish. Sections of the bone are cut away to reveal an intricate inner core of interlocking brass and steel gears, braided copper wires, and hydraulic pistons. The gears are interconnected, with wires weaving between them, creating a complex, steampunk aesthetic. The model should be high-poly (4–8 million polygons), fully UV-mapped with PBR textures (diffuse, normal, roughness, metallic, ambient occlusion) in 4K resolution. Export as .fbx and .obj, with a clean, layered structure for easy editing.

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