穿孔表面与后层有间距

提示词

穿孔面与后层保持可读间距，孔洞内可见适度深度与遮挡。后层按实际设定显示，不把所有孔填成平面的统一黑点。

Keep a readable separation between a perforated surface and its backing, showing modest depth and occlusion inside the holes. Show the backing as specified rather than filling every opening with uniform flat black dots.