Bug fixes

Assets/ThemeBundles/DepartureToMultiverse/Shaders/DTM_RandomGridTube.shader

@@ -178,7 +178,12 @@ Shader "Soullies/DTM_RandomGridTube"
                 float u = angle * _TubeRadius;
                 
                 // V is driven by World Z to maintain seamless tiling
-                float v = input.positionWS.z;
+               // 1. 获取管道局部Z轴在世界空间中的单位方向向量
+                float3 tubeForwardWS = TransformObjectToWorldDir(float3(0, 0, 1));
+
+                // 2. 将世界坐标投影到管道的正前方，替代原本写死的 World Z
+                // 这样无论管道怎么旋转，V轴永远沿着管道的长度方向进行世界坐标级别的无缝平铺
+                float v = dot(input.positionWS, tubeForwardWS);
 
                 float2 cylindricalUV = float2(u, v);