diff --git a/demo/cesium/3dtiles.html b/demo/cesium/3dtiles.html
index 074832c8c..6f4df7cfe 100644
--- a/demo/cesium/3dtiles.html
+++ b/demo/cesium/3dtiles.html
@@ -71,7 +71,8 @@
         viewer.scene.globe.depthTestAgainstTerrain = true;
 
         const tileset = await Cesium.Cesium3DTileset.fromUrl(
-          "/examples/3dtiles/tileset.json"
+          "./examples/3dtiles_textured/tileset.json",
+          { enableDebugWireframe: true }
         );
         viewer.scene.primitives.add(tileset);
         viewer.zoomTo(tileset);
diff --git a/nusamai/src/sink/cesiumtiles/slice.rs b/nusamai/src/sink/cesiumtiles/slice.rs
index 295ecbd47..00575b9c3 100644
--- a/nusamai/src/sink/cesiumtiles/slice.rs
+++ b/nusamai/src/sink/cesiumtiles/slice.rs
@@ -255,8 +255,6 @@ fn slice_polygon(
     for yi in y_range.clone() {
         let (k1, k2) = tiling::y_slice_range(zoom, yi);
 
-        // todo?: check interior bbox to optimize
-
         for (ri, (ring, uv_ring)) in poly.rings().zip_eq(poly_uv.rings()).enumerate() {
             if ring.raw_coords().is_empty() {
                 continue;
@@ -335,8 +333,6 @@ fn slice_polygon(
         for (xi, xs) in x_iter {
             let (k1, k2) = tiling::x_slice_range(zoom, xi, xs);
 
-            // todo?: check interior bbox to optimize ...
-
             let key = (
                 zoom,
                 xi.rem_euclid(1 << zoom) as u32, // handling geometry crossing the antimeridian