{ "Object": "GT3-class brake disc", "Material": "Grey cast iron (SAE J431 G3000 / EN-GJL-200)", "Shape/Form": "Ventilated disc, 380–390 mm Ø × 34–36 mm thick, 60–84 radial vanes with curved (J-hook) profile, floating-bobbins mounting interface for center-lock hub", "Color Scheme": "Bare metallic grey", "Texture Details": "Turned friction faces Ra 2–4 µm with fine machining grooves; milled/ground vanes; raw sand-cast microtexture inside vents; precision-bored hat interface", "Style": "Realistic PBR", "Environment/Use Context": "High-fidelity engineering prototype for FEA/CFD validation and manufacturing setup", "Reference Models": [ "<URL or local path to STEP/IGES from 3D scan or CMM data>" ], "Polycount": "<e.g. 100 k triangles>", }