diff --git a/src/scene/pipeline/mod.rs b/src/scene/pipeline/mod.rs
index 8d1594f7a..ce75f4e1b 100644
--- a/src/scene/pipeline/mod.rs
+++ b/src/scene/pipeline/mod.rs
@@ -1394,6 +1394,15 @@ impl Pipeline {
                 if wire.instance_count == 0 {
                     continue;
                 }
+                // PolyfaceMesh / PolygonMesh outline edges live in
+                // `gpu_wires` (their `WireModel` has both `points` and
+                // `fill_tris`). In FlatShaded / GouraudShaded the user
+                // wants a clean shaded surface, so the wire pass skips
+                // these instances; the *WithEdges and pure wireframe
+                // modes leave the flag at true and draw them.
+                if !show_3d_edges && wire.is_3d_mesh_edge {
+                    continue;
+                }
                 match self.wire_pixel_scissors.get(i) {
                     Some(Some([x, y, w, h])) => {
                         pass.set_scissor_rect(*x, *y, *w, *h);
diff --git a/src/scene/pipeline/wire_gpu.rs b/src/scene/pipeline/wire_gpu.rs
index ac96d2cea..d2a6d4a8b 100644
--- a/src/scene/pipeline/wire_gpu.rs
+++ b/src/scene/pipeline/wire_gpu.rs
@@ -137,6 +137,12 @@ pub struct WireGpu {
     /// Paper-space bbox [x0, y0, x1, y1] for GPU scissor clipping.
     /// Set only for viewport-projected wires; None for regular wires.
     pub vp_scissor: Option<[f32; 4]>,
+    /// `true` when the source `WireModel` also carries `fill_tris`
+    /// (i.e. it is a 3D mesh face — PolyfaceMesh / PolygonMesh — whose
+    /// outline lives in `points`). The wire pass skips these instances
+    /// in shaded modes so the surface reads as a clean solid; pure
+    /// wireframe / HiddenLine / *WithEdges modes draw them.
+    pub is_3d_mesh_edge: bool,
 }
 
 /// Expand one `WireModel` into its per-segment instance stream (1 instance per
@@ -225,6 +231,7 @@ impl WireGpu {
     pub fn new(device: &wgpu::Device, wire: &WireModel) -> Self {
         let mut g = Self::build(device, wire, wire.color);
         g.vp_scissor = wire.vp_scissor;
+        g.is_3d_mesh_edge = !wire.fill_tris.is_empty();
         g
     }
 
@@ -273,6 +280,7 @@ impl WireGpu {
                     instance_buffer,
                     instance_count: chunk.len() as u32,
                     vp_scissor: None,
+                    is_3d_mesh_edge: false,
                 }
             })
             .collect()
@@ -287,6 +295,7 @@ impl WireGpu {
             instance_buffer,
             instance_count: instances.len() as u32,
             vp_scissor: None,
+            is_3d_mesh_edge: false,
         }
     }
 }