diff --git a/tests/AcDream.App.Tests/Rendering/Walk/WalkTraceReplay.cs b/tests/AcDream.App.Tests/Rendering/Walk/WalkTraceReplay.cs
index c6ac9e18..76778d58 100644
--- a/tests/AcDream.App.Tests/Rendering/Walk/WalkTraceReplay.cs
+++ b/tests/AcDream.App.Tests/Rendering/Walk/WalkTraceReplay.cs
@@ -19,16 +19,28 @@ namespace AcDream.App.Tests.Rendering.Walk;
 /// </summary>
 public sealed class WalkTraceReplayContext : IWalkFrameContext, IRetailFrameWalkContext
 {
-    private sealed class BasisRayCaster(
-        Vector3 right, Vector3 forward, Vector3 up,
-        float halfWidth, float halfHeight, float focal) : IWalkRayCaster
+    // Retail projection globals, dumped live from the capture client
+    // (recon 2026-08-30 evening: Render::bw/bh/xinvscale/yinvscale/tx/ty/vdst).
+    public const float RetailViewportWidth = 1024f;
+    public const float RetailViewportHeight = 720f;
+    public const float RetailXInvScale = 0.00025f;
+    public const float RetailYInvScale = 0.00025f;
+    public const float RetailTx = 0.127875f;
+    public const float RetailTy = 0.089875f;
+    public const float RetailVdst = 0.1330766976f;
+
+    private sealed class RetailRayCaster(
+        Vector3 right, Vector3 forward, Vector3 up) : IWalkRayCaster
     {
+        // Retail's unproject (copy_view's ray path; equal to
+        // ScreenToViewTransform for these globals):
+        //   u = sx·xinvscale − tx;  w = sy·yinvscale − ty
+        //   ray = Xaxis·u + Yaxis·vdst − Zaxis·w
         public Vector3 RayThrough(float screenX, float screenY)
         {
-            // Screen origin top-left, y down (the xformStart convention).
-            float nx = (screenX - halfWidth) / halfWidth;
-            float ny = (halfHeight - screenY) / halfHeight;
-            return right * (nx / focal) + forward + up * (ny / focal);
+            float u = screenX * RetailXInvScale - RetailTx;
+            float w = screenY * RetailYInvScale - RetailTy;
+            return right * u + forward * RetailVdst - up * w;
         }
     }
 
@@ -36,10 +48,7 @@ public sealed class WalkTraceReplayContext : IWalkFrameContext, IRetailFrameWalk
     private readonly Matrix4x4 _viewProjection;
     private readonly IWalkRayCaster _rays;
 
-    public WalkTraceReplayContext(
-        WalkOraclePose pose, Dictionary<uint, WalkCell> cells,
-        float viewportWidth = 800f, float viewportHeight = 600f,
-        float verticalFovRadians = 1.0f)
+    public WalkTraceReplayContext(WalkOraclePose pose, Dictionary<uint, WalkCell> cells)
     {
         _cells = cells;
         WorldViewpoint = pose.Origin;
@@ -48,16 +57,16 @@ public sealed class WalkTraceReplayContext : IWalkFrameContext, IRetailFrameWalk
         Vector3 up = Vector3.Transform(Vector3.UnitZ, rotation);
         Vector3 right = Vector3.Transform(Vector3.UnitX, rotation);
 
+        // The exact retail frustum: tan(halfFovY) = ty/vdst, aspect = tx/ty.
+        float fovY = 2f * MathF.Atan(RetailTy / RetailVdst);
         Matrix4x4 view = Matrix4x4.CreateLookAt(pose.Origin, pose.Origin + forward, up);
         Matrix4x4 projection = Matrix4x4.CreatePerspectiveFieldOfView(
-            verticalFovRadians, viewportWidth / viewportHeight, 0.1f, 5000f);
+            fovY, RetailTx / RetailTy, 0.1f, 5000f);
         _viewProjection = view * projection;
 
-        ViewportWidth = viewportWidth;
-        ViewportHeight = viewportHeight;
-        float focal = MathF.Tan(verticalFovRadians / 2f);
-        _rays = new BasisRayCaster(
-            right, forward, up, viewportWidth / 2f, viewportHeight / 2f, focal);
+        ViewportWidth = RetailViewportWidth;
+        ViewportHeight = RetailViewportHeight;
+        _rays = new RetailRayCaster(right, forward, up);
 
         // The retail CY near plane: N = forward, d = −dot(eye, forward) − znear.
         CyPlane = new WalkPlane(forward, -Vector3.Dot(pose.Origin, forward) - 0.1f);
diff --git a/tools/walk-oracle/fw1-proj-recon.cdb b/tools/walk-oracle/fw1-proj-recon.cdb
new file mode 100644
index 00000000..73812ce1
--- /dev/null
+++ b/tools/walk-oracle/fw1-proj-recon.cdb
@@ -0,0 +1,21 @@
+.logopen C:\Users\erikn\AppData\Local\Temp\claude\C--Users-erikn-source-repos-acdream--claude-worktrees-peaceful-blackburn-5333f0\e3dbd387-d947-4f49-964d-d454fc9c7d83\scratchpad\fw1-proj-recon.log
+.sympath C:\Users\erikn\source\repos\acdream\refs
+.symopt+ 0x40
+.reload /f acclient.exe
+x acclient!Render::bw
+x acclient!Render::bh
+x acclient!Render::xinvscale
+x acclient!Render::yinvscale
+x acclient!Render::tx
+x acclient!Render::ty
+x acclient!Render::vdst
+x acclient!Render::viewer_world_space
+dd acclient!Render::bw L1
+dd acclient!Render::bh L1
+dd acclient!Render::xinvscale L1
+dd acclient!Render::yinvscale L1
+dd acclient!Render::tx L1
+dd acclient!Render::ty L1
+dd acclient!Render::vdst L1
+.logclose
+qd