金属的各向异性：拉丝方向决定高光

Create a close architectural visualisation of metal surfaces where the highlight behaviour is what sells the material. Show brushed stainless steel with its highlight stretched into a band perpendicular to the brush direction, changing as the surface curves, rather than the round highlight of a polished sphere. Detail an anodised aluminium extrusion beside it with a much tighter, more directional specular and a slightly coloured base tone. Show a weathering steel panel nearby with no specular at all — a completely diffuse, granular oxidised surface — so the contrast between the three metals is legible in one frame. Detail the reflections in the polished metal as darkened, slightly tinted by the metal's own colour, and distorted by the surface's real flatness deviations. Show the joints and fixings as the elements that prove scale: a countersunk screw, a slim shadow gap, a mitred corner with a fine line. Detail the light as raking so the brush direction is unmistakable. Photorealistic, metallic and precise, close view.