stone wall 3d model

Generate a highly detailed realistic modular 3D stone wall segment designed for use as a repeatable game-ready asset. The wall should feature naturally arranged stones with realistic mortar gaps, varied stone sizes and colors, and weathered surface detail. The segment should be one unit in length with exact pivot points at both ends to allow seamless snapping and repetition when placed in sequence. The wall should include a flat top surface suitable for stacking additional layers. Ensure clean topology, appropriate polygon density for real-time rendering, and a fully closed manifold mesh. The final result should be optimized for infinite array placement in Unity.