diff --git a/Engine/src/Renderer/Cubemap.cpp b/Engine/src/Renderer/Cubemap.cpp
index 6a3f3cc..2f59982 100644
--- a/Engine/src/Renderer/Cubemap.cpp
+++ b/Engine/src/Renderer/Cubemap.cpp
@@ -328,13 +328,17 @@ namespace Engine
             cmd.pipelineBarrier2(
                 vk::DependencyInfo{}.setImageMemoryBarriers(toTransfer));
 
+            // 逐 mip 逐面拷贝；buffer 偏移必须按 mips[0..mip) 字节数累积
+            //（mip 面尺寸递减，用当前 dim 乘 mip 序号会错位 → 读到
+            // staging 未初始化数据 → fp16 NaN 污染整屏）
+            vk::DeviceSize offset = 0;
             for (u32 mip = 0; mip < mipCount; ++mip) {
                 const u32 dim = mips[mip].faceSize;
                 for (u32 f = 0; f < kFaceCount; ++f) {
                     vk::BufferImageCopy region;
                     region.setBufferOffset(
-                               (static_cast<vk::DeviceSize>(dim) * dim * 8 *
-                                kFaceCount) * mip)
+                               offset + static_cast<vk::DeviceSize>(dim) *
+                                        dim * 8 * f)
                           .setBufferRowLength(0)
                           .setBufferImageHeight(0)
                           .setImageSubresource({vk::ImageAspectFlagBits::eColor,
@@ -345,6 +349,8 @@ namespace Engine
                                           vk::ImageLayout::eTransferDstOptimal,
                                           region);
                 }
+                offset += static_cast<vk::DeviceSize>(dim) * dim * 8 *
+                          kFaceCount;
             }
 
             vk::ImageMemoryBarrier2 toShader;
diff --git a/Engine/src/Renderer/Passes/SceneGpu.cpp b/Engine/src/Renderer/Passes/SceneGpu.cpp
index 44b35a5..2be4183 100644
--- a/Engine/src/Renderer/Passes/SceneGpu.cpp
+++ b/Engine/src/Renderer/Passes/SceneGpu.cpp
@@ -166,11 +166,14 @@ namespace Engine::Passes
 
     void SceneGpu::BindEnvironment(const Cubemap& env)
     {
-        // IBL 资源 view 全程稳定（不随 RG 重编译变化），绑一次即可
+        // IBL 资源 view 全程稳定（不随 RG 重编译变化），绑一次即可。
+        // cube 资源必须用带 mip 的环境采样器（textureLod 显式 lod 会被
+        // clamp 到 maxLod；shadowSampler maxLod=0 会让 pre-filter 永远
+        // 停在最锐的 mip）
         for (u32 slot = 0; slot < kMaxFramesInFlight; ++slot) {
-            m_Descriptors.UpdateTexture(shadowSets[slot], 3, shadowSampler,
+            m_Descriptors.UpdateTexture(shadowSets[slot], 3, env.GetSampler(),
                                         env.GetIrradianceView());
-            m_Descriptors.UpdateTexture(shadowSets[slot], 4, shadowSampler,
+            m_Descriptors.UpdateTexture(shadowSets[slot], 4, env.GetSampler(),
                                         env.GetPrefilteredView());
             m_Descriptors.UpdateTexture(shadowSets[slot], 5,
                                         env.GetBrdfLutSampler(),