超写实3D渲染，产品级静物摄影，单把古代中式环首腰刀，横向陈列在浅灰色哑光平面上，刀身朝向左下角，刀柄朝向右上角；深炭灰色向浅灰渐变的哑光纯色背景，侧方柔和柔光照明，刀身向右下方投射淡而柔和的长阴影；刀身为做旧暗银金属材质，带有两道平行纵向凹槽，刀刃边缘有轻微锈迹与磨损痕迹，刀尖向上翘曲；黄铜色圆形刀格带有上下两个突出的黄铜圆环，刀镡部分为抛光黄铜材质；握把中部为深棕色皮革交叉缠绕，前后段为深色木质，靠近刀柄末端有黄铜装饰环，刀柄末端为圆球状深实木配重；冷灰与暖金交织的低饱和色调，45度斜俯拍中近景，正方形画幅，细节锐利，质感真实。

Ultra-realistic 3D rendering, product-level still life photography, a single ancient Chinese ring-headed waist knife placed horizontally on a light gray matte surface, blade facing the lower left corner, handle facing the upper right corner; matte solid color background with gradient from dark charcoal gray to light gray, soft side lighting, casting a faint and soft long shadow towards the lower right of the blade; the blade is made of distressed dark silver metal with two parallel longitudinal grooves, slight rust and wear marks on the edge, tip curving upward; brass round guard with two protruding brass rings on the top and bottom, the tsuba part is polished brass; the middle of the handle is wrapped with dark brown leather crosswise, the front and rear sections are dark wood, brass decorative ring near the end of the handle, the end of the handle is a round dark solid wood counterweight; low-saturation tone interwoven with cool gray and warm gold, 45-degree oblique close-up shot, square frame, sharp details, realistic texture.