跑步机上铺好的那条柏油路

Scene: a tiny figurine runner, dressed in a red singlet and grey shorts, pounds along a treadmill. Rather than rubber, the belt has been dressed as a road: matte grey asphalt carrying white dashed lane markings down its length. Viewpoint: straight from the side. The near half of the machine's housing is sliced away in a neat vertical cross-section, so you can follow the belt as a closed loop. The road travels forward across the front roller and the rear roller, then the same belt comes back flat and taut beneath the running deck. It attaches to both rollers, so the whole circuit is one unbroken, continuous loop. At the far end of the platform, a small doorway structure is fixed right on the edge. The road exists on the belt alone and stops there. Materials: figurine parts in matte painted metal, smooth matte asphalt. Light: even and soft, studio style. Shadow: a single compact oval contact shadow under the treadmill base. Output spec: conceptual miniature diorama, 16:9 widescreen, delivered as a cutout on a truly transparent background with a genuine alpha channel. Edge pixels are alpha = 0: no white, no tint, no checkerboard pattern. A soft, semi-transparent black shadow in the alpha channel anchors the model, densest under the base and dissolving outward. Keep treadmill, runner and doorway completely inside the frame with clear margin all around; no element touches or crosses any edge.