{ "object": "In-line six engine", "material": "Cast iron engine block with aluminum cylinder head and chrome-plated accessory housings", "shape_form": "Straight six-cylinder layout with integrated intake manifold, exhaust headers, pulley system and timing chain cover", "color_scheme": "Matte graphite gray block, brushed aluminum head, polished chrome accents on pipes and pulleys", "texture_details": { "engine_block": "Rough cast surface with subtle pitting and machining marks", "cylinder_head": "Smooth brushed metal finish with light tool scratches", "accessories": "High-gloss chrome plating with realistic smudges and fingerprints" }, "style": "Realistic (PBR)", "reference_models": [ "BMW M30 straight-six", "Toyota 2JZ inline-six" ] }