fix(render): draw block-contained 3D faces

src/scene/cache/block_cache.rs

@@ -48,6 +48,7 @@ pub struct LocalWire {
     pub tangent_geoms: Vec<TangentGeom>,
     pub fill_tris: Vec<[f32; 3]>,
     pub fill_tris_low: Vec<[f32; 3]>,
+    pub fill_is_3d: bool,
     /// Preserves the planar SOLID classification through block expansion so
     /// it never gets merged with unrelated annotation fills of the same style.
     pub fill_is_2d_solid: bool,
@@ -789,6 +790,7 @@ fn tessellate_sub_local(
             tangent_geoms: wire.tangent_geoms,
             fill_tris: wire.fill_tris,
             fill_tris_low: wire.fill_tris_low,
+            fill_is_3d: wire.fill_is_3d,
             fill_is_2d_solid: wire.fill_is_2d_solid,
             pick_tris: wire.pick_tris,
             pick_tris_low: wire.pick_tris_low,
@@ -1359,6 +1361,7 @@ struct StyleKey {
     /// Part of the batch key so planar SOLID fills remain independently
     /// switchable after block geometry is merged by style.
     fill_is_2d_solid: bool,
+    fill_is_3d: bool,
     /// Bit-cast composed block-local depth for band wires (`0` = no override).
     /// Keeps bands of different in-block draw ranks in separate batches so
     /// each finalized WireModel carries one correct `depth_override`.
@@ -1391,6 +1394,7 @@ struct BatchEntry {
     /// reconstructs `high + low`). Without it absolute f32 fills quantize to
     /// ~0.5 m and the greek-text rectangles shear.
     fill_tris_low: Vec<[f32; 3]>,
+    fill_is_3d: bool,
     fill_is_2d_solid: bool,
     /// Accumulated thickness-wall pick geometry, paired high/low like
     /// `fill_tris`. Pick-only — no GPU batch reads this.
@@ -1455,6 +1459,7 @@ impl BatchEntry {
         plinegen: bool,
         _is_fill_only: bool,
         fill_is_2d_solid: bool,
+        fill_is_3d: bool,
     ) -> Self {
         // `is_fill_only` is part of the StyleKey hash so greek fills never
         // share a batch with regular wires (otherwise the finalized
@@ -1473,6 +1478,7 @@ impl BatchEntry {
             aci,
             plinegen,
             fill_is_2d_solid,
+            fill_is_3d,
             min_x: f32::INFINITY,
             min_y: f32::INFINITY,
             max_x: f32::NEG_INFINITY,
@@ -1515,7 +1521,7 @@ impl Batches {
                     taper_widths: Vec::new(),
                     world_width: b.world_width,
                     depth_override: b.local_depth,
-                    fill_is_3d: false,
+                    fill_is_3d: b.fill_is_3d,
                     fill_is_2d_solid: b.fill_is_2d_solid,
                     render_instance: None,
                     pick_tris: b.pick_tris,
@@ -1566,6 +1572,7 @@ fn style_key(
     plinegen: bool,
     is_fill_only: bool,
     fill_is_2d_solid: bool,
+    fill_is_3d: bool,
     local_depth: Option<f32>,
 ) -> StyleKey {
     StyleKey {
@@ -1595,6 +1602,7 @@ fn style_key(
         plinegen,
         is_fill_only,
         fill_is_2d_solid,
+        fill_is_3d,
         depth_bits: local_depth.map_or(0, f32::to_bits),
     }
 }
@@ -2005,6 +2013,7 @@ fn emit_wire(
         lw.plinegen,
         lw.is_fill_only,
         lw.fill_is_2d_solid,
+        lw.fill_is_3d,
         local_depth,
     );
 
@@ -2031,6 +2040,7 @@ fn emit_wire(
             lw.plinegen,
             lw.is_fill_only,
             lw.fill_is_2d_solid,
+            lw.fill_is_3d,
         )
     });
     entry.local_depth = local_depth;