diff --git a/BUILD.md b/BUILD.md
index e2eba2b..c150543 100644
--- a/BUILD.md
+++ b/BUILD.md
@@ -191,7 +191,7 @@ press again before concluding a key is broken.
 
 | Key | State |
 |-----|-------|
-| **Alt+W** wireframe | **Live.** Reimplemented on D3D9 as a per-frame `D3DRS_FILLMODE` (`gWireframe`, [MUNGA_L4/L4VIDEO.cpp](MUNGA_L4/L4VIDEO.cpp)). The sky dome and the 2D pass (gunsight, cam-ship HUD) are held solid; particles are wireframed with everything else. |
+| **Alt+W** wireframe | **Live.** Reimplemented on D3D9 as a per-frame `D3DRS_FILLMODE` (`gWireframe`, [MUNGA_L4/L4VIDEO.cpp](MUNGA_L4/L4VIDEO.cpp)). The view clears to black and the sky pass is skipped, so the edges stand on their own — with the lit dome in place the far half of the scene is unreadable. The 2D pass (gunsight, cam-ship HUD) is held solid; particles are wireframed with everything else. Fog still applies, so distant edges tint toward the fog colour rather than staying white. |
 | **Alt+E** event-queue dump | **Live.** Reaches `GeneralEventQueue::DumpEventQueue`. |
 | Alt+V predator vision | Inert. |
 | Alt+F frame dump | Inert. |
diff --git a/MUNGA_L4/L4VIDEO.cpp b/MUNGA_L4/L4VIDEO.cpp
index f0df866..ffc8253 100644
--- a/MUNGA_L4/L4VIDEO.cpp
+++ b/MUNGA_L4/L4VIDEO.cpp
@@ -6411,15 +6411,25 @@ void DPLRenderer::ExecuteImplementation(RendererComplexity, RendererOrigin::Inte
 
 	DWORD currentFog;
 	mDevice->GetRenderState(D3DRS_FOGCOLOR, &currentFog);
-	hr = mDevice->Clear(0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER, currentFog, 1.0f, 0);
+	//
+	// The frame is normally cleared to the fog colour so the horizon has
+	// nothing to hide. Under Alt+W it clears to BLACK instead, and the sky
+	// pass is skipped entirely (below) - so what backs the wireframe is
+	// black rather than a lit dome, which is the whole point of asking for
+	// wireframe. Nothing on the solid path changes.
+	//
+	hr = mDevice->Clear(
+		0, NULL, D3DCLEAR_TARGET | D3DCLEAR_ZBUFFER,
+		gWireframe ? D3DCOLOR_XRGB(0, 0, 0) : currentFog,
+		1.0f, 0
+	);
 
 	hr = mDevice->BeginScene();
 
 	//
 	// Alt+W wireframe. Set every frame from the flag rather than once at
-	// toggle time - see gWireframe. It is turned back off for the sky pass
-	// and again for the 2D pass below; everything between here and there
-	// draws as edges.
+	// toggle time - see gWireframe. It is turned back off for the 2D pass
+	// below; everything between here and there draws as edges.
 	//
 	mDevice->SetRenderState(
 		D3DRS_FILLMODE,
@@ -6503,33 +6513,27 @@ void DPLRenderer::ExecuteImplementation(RendererComplexity, RendererOrigin::Inte
 	mDevice->SetTransform(D3DTS_PROJECTION, &mProjectionMatrix);
 
 	//
-	// The sky stays solid under Alt+W. Wireframing the dome fills the top
-	// of the screen with its own tessellation and buries the geometry you
-	// turned wireframe on to look at; a solid sky gives the edges something
-	// to read against.
+	// The sky is not drawn at all under Alt+W - the black clear above
+	// stands in for it. Drawing it solid lights the top of the screen and
+	// drowns the edges you turned wireframe on to look at; drawing it in
+	// wireframe is worse, filling the same area with the dome's own
+	// tessellation. Skipping it costs nothing: the dome only ever covers
+	// pixels the clear already owns.
 	//
-	if (gWireframe)
+	if (!gWireframe)
 	{
-		mDevice->SetRenderState(D3DRS_FILLMODE, D3DFILL_SOLID);
-	}
-
-
-	if (!l4_application->IsDead())
-	{
-		std::list<d3d_OBJECT*>::const_iterator iter;
-
-		for (iter = this->mConsolidatedStaticObjects.begin(); iter != this->mConsolidatedStaticObjects.end(); ++iter)
+		if (!l4_application->IsDead())
 		{
-			(*iter)->Draw(PASS_SKY, &viewTransform, mTargetRenderTime);
+			std::list<d3d_OBJECT*>::const_iterator iter;
+
+			for (iter = this->mConsolidatedStaticObjects.begin(); iter != this->mConsolidatedStaticObjects.end(); ++iter)
+			{
+				(*iter)->Draw(PASS_SKY, &viewTransform, mTargetRenderTime);
+			}
 		}
-	}
 
-	for (d3d_OBJECT *obj = mRenderLists[PASS_SKY]; obj != NULL; obj = obj->GetNext(PASS_SKY))
-		obj->Draw(PASS_SKY, &viewTransform, mTargetRenderTime);
-
-	if (gWireframe)
-	{
-		mDevice->SetRenderState(D3DRS_FILLMODE, D3DFILL_WIREFRAME);
+		for (d3d_OBJECT *obj = mRenderLists[PASS_SKY]; obj != NULL; obj = obj->GetNext(PASS_SKY))
+			obj->Draw(PASS_SKY, &viewTransform, mTargetRenderTime);
 	}
 
 	//Reactivate fog
diff --git a/RP_L4/RPL4ENVIRON.cpp b/RP_L4/RPL4ENVIRON.cpp
index 3974cdc..9e5ea08 100644
--- a/RP_L4/RPL4ENVIRON.cpp
+++ b/RP_L4/RPL4ENVIRON.cpp
@@ -411,9 +411,9 @@ namespace
 "# ---- Developer / testing ----------------------------------------------------\n"
 "\n"
 "# Nonzero arms the debug keys. Two of them do something in this build:\n"
-"#   Alt+W   wireframe. The sky dome stays solid so the edges have\n"
-"#           something to read against, and the gunsight and cam-ship\n"
-"#           HUD stay solid too.\n"
+"#   Alt+W   wireframe. The sky is not drawn and the view clears to\n"
+"#           black, so the edges stand on their own; the gunsight and\n"
+"#           cam-ship HUD stay solid.\n"
 "#   Alt+E   write the event queue to the log.\n"
 "# The others are stubs the 2007 DPL->Direct3D port left behind and do\n"
 "# nothing at all. They are named here so a dead key is not mistaken for\n"