diff --git a/src/AcDream.App/Rendering/Shaders/spv/shaders.manifest.json b/src/AcDream.App/Rendering/Shaders/spv/shaders.manifest.json
index 277e5146..0bd707cb 100644
--- a/src/AcDream.App/Rendering/Shaders/spv/shaders.manifest.json
+++ b/src/AcDream.App/Rendering/Shaders/spv/shaders.manifest.json
@@ -105,9 +105,8 @@
       "stages": [
         {
           "stage": "vert",
-          "sourceSha256": "4de580ce11b8d755d3558dc49bf7ebccec54d307595d91c38b5c5d552d645c7e",
-          "compiled": false,
-          "message": "terrain_modern.vert:221: error: \u0027uProjection\u0027 : undeclared identifier"
+          "sourceSha256": "336880b293e95c9ba13dce7a616a15e941191afec8bdaabe04a4993182eb6811",
+          "compiled": true
         },
         {
           "stage": "frag",
diff --git a/src/AcDream.App/Rendering/Shaders/terrain_modern.vert b/src/AcDream.App/Rendering/Shaders/terrain_modern.vert
index db8224ef..254b948e 100644
--- a/src/AcDream.App/Rendering/Shaders/terrain_modern.vert
+++ b/src/AcDream.App/Rendering/Shaders/terrain_modern.vert
@@ -13,8 +13,16 @@ layout(location = 3) in uvec4 aPacked1;
 layout(location = 4) in uvec4 aPacked2;
 layout(location = 5) in uvec4 aPacked3;
 
-uniform mat4 uView;
-uniform mat4 uProjection;
+// Campaign V slice V6f-1: uView/uProjection converged into the single
+// uViewProjection that GpuPushConstants already carries, so terrain can be
+// expressed in Vulkan GLSL at all — two loose mat4 uniforms are 128 bytes and
+// cannot both fit the pinned 96-byte push block, and Vulkan GLSL has no default
+// uniform block to hold them loose. The product is now formed on the CPU
+// (camera.View * camera.Projection) instead of per vertex here; the two are the
+// same transform, and System.Numerics' row-vector layout uploaded untransposed
+// reads in GLSL as the transpose, so (View*Proj)^T == Proj^T * View^T is exactly
+// the uProjection * uView this replaced.
+uniform mat4 uViewProjection;
 
 struct Light {
     vec4 posAndKind;
@@ -165,7 +173,7 @@ void main() {
     // the un-nudged heightmap via TerrainSurface.SampleZ.
     // Closes issue #100; supersedes the hiddenTerrainCells cell-collapse hack.
     vec3 terrainPos = vec3(aPos.xy, aPos.z - 0.01);
-    gl_Position = uProjection * uView * vec4(terrainPos, 1.0);
+    gl_Position = uViewProjection * vec4(terrainPos, 1.0);
 
     // Phase U.3: terrain clip gate against the single OutsideView region. With
     // uTerrainClipCount == 0 (U.3 default) the first loop is skipped and the
diff --git a/src/AcDream.App/Rendering/TerrainModernRenderer.cs b/src/AcDream.App/Rendering/TerrainModernRenderer.cs
index 643a2d1a..1308248f 100644
--- a/src/AcDream.App/Rendering/TerrainModernRenderer.cs
+++ b/src/AcDream.App/Rendering/TerrainModernRenderer.cs
@@ -494,15 +494,18 @@ public sealed unsafe class TerrainModernRenderer : IDisposable
 
         // Bind shader + uniforms + atlas handles.
         // Verified Phase W Stage 4 (T4.2): terrain projects from the camera view-proj;
-        // no separate landscape viewpoint to sync. Both uView and uProjection derive
-        // from the ICamera passed into this method — the same camera used for all other
+        // no separate landscape viewpoint to sync. uViewProjection derives from
+        // the ICamera passed into this method — the same camera used for all other
         // renderers in the unified pipeline. Retail's LScape::update_viewpoint
         // pre-positions terrain to the outdoor landcell, but acdream uses the
         // unified camera matrix everywhere, so no separate viewpoint divergence can occur.
         _shader.Use();
         UploadTextureTilingOnce();
-        _shader.SetMatrix4("uView", camera.View);
-        _shader.SetMatrix4("uProjection", camera.Projection);
+        // Campaign V slice V6f-1: one uViewProjection, matching the field
+        // GpuPushConstants already carries, instead of the separate uView and
+        // uProjection the shader used to combine per vertex. viewProjection is
+        // the same product the visibility pass above already computed.
+        _shader.SetMatrix4("uViewProjection", viewProjection);
 
         var (terrainHandle, alphaHandle) = _atlas.GetBindlessHandles();
         // Campaign V slice V2b: pass each handle's binding=9 table slot