feat(render): solid fill for PolyfaceMesh and PolygonMesh entities

PolyfaceMesh and PolygonMesh were wireframe-only. They now render with
the same flat-color solid fill as Face3D entities.

- Add fill_tris: Vec<[f32;3]> to TruckEntity and WireModel
- PolyfaceMesh: fan-triangulate each face into fill_tris
- PolygonMesh: triangulate each grid quad into fill_tris
- tessellate.rs Lines branch: apply world_offset to fill_tris
- Face3DGpu::from_wires: collect fill_tris from all wires in addition
  to Face3D key_vertices quads
- upload_face3d: pass all_wires so fill_tris are batched into one draw call

src/entities/arc.rs

@@ -87,6 +87,7 @@ fn to_truck(arc: &Arc) -> TruckEntity {
             snap_pts: vec![(cv, SnapHint::Center)],
             tangent_geoms: vec![tangent],
             key_vertices: vec![],
+            fill_tris: vec![],
         };
     }
 
@@ -101,6 +102,7 @@ fn to_truck(arc: &Arc) -> TruckEntity {
         snap_pts: vec![(cv, SnapHint::Center)],
         tangent_geoms: vec![tangent],
         key_vertices: vec![],
+        fill_tris: vec![],
     }
 }
 

src/entities/attribute.rs

@@ -42,6 +42,7 @@ impl TruckConvertible for AttributeDefinition {
             snap_pts: vec![(snap_pt, SnapHint::Insertion)],
             tangent_geoms: vec![],
             key_vertices: vec![],
+            fill_tris: vec![],
         })
     }
 }
@@ -146,6 +147,7 @@ impl TruckConvertible for AttributeEntity {
             snap_pts: vec![(snap_pt, SnapHint::Insertion)],
             tangent_geoms: vec![],
             key_vertices: vec![],
+            fill_tris: vec![],
         })
     }
 }

src/entities/circle.rs

@@ -91,6 +91,7 @@ fn to_truck(circle: &Circle) -> TruckEntity {
             snap_pts,
             tangent_geoms: vec![tangent],
             key_vertices: vec![],
+            fill_tris: vec![],
         };
     }
 
@@ -104,6 +105,7 @@ fn to_truck(circle: &Circle) -> TruckEntity {
         snap_pts,
         tangent_geoms: vec![tangent],
         key_vertices: vec![],
+        fill_tris: vec![],
     }
 }
 

src/entities/ellipse.rs

@@ -102,6 +102,7 @@ fn to_truck(ell: &Ellipse) -> TruckEntity {
             snap_pts,
             tangent_geoms: vec![],
             key_vertices: vec![],
+            fill_tris: vec![],
         }
     } else {
         let n = 32usize;
@@ -133,6 +134,7 @@ fn to_truck(ell: &Ellipse) -> TruckEntity {
             snap_pts: vec![(center_v3, SnapHint::Center)],
             tangent_geoms: vec![],
             key_vertices,
+            fill_tris: vec![],
         }
     }
 }

src/entities/leader.rs

@@ -64,6 +64,7 @@ fn to_truck(leader: &Leader) -> TruckEntity {
         snap_pts: vec![],
         tangent_geoms: tangents,
         key_vertices: key_verts,
+        fill_tris: vec![],
     }
 }
 

src/entities/line.rs

@@ -50,6 +50,7 @@ fn to_truck(line: &Line) -> TruckEntity {
             snap_pts: vec![],
             tangent_geoms: vec![tangent],
             key_vertices: kv,
+            fill_tris: vec![],
         };
     }
 
@@ -61,6 +62,7 @@ fn to_truck(line: &Line) -> TruckEntity {
         snap_pts: vec![],
         tangent_geoms: vec![tangent],
         key_vertices: kv,
+        fill_tris: vec![],
     }
 }
 

src/entities/lwpolyline.rs

@@ -106,7 +106,7 @@ fn thick_segments(
             pts.push(off(last));
         }
     }
-    TruckEntity { object: TruckObject::Lines(pts), snap_pts: vec![], tangent_geoms: tangents, key_vertices: key_verts }
+    TruckEntity { object: TruckObject::Lines(pts), snap_pts: vec![], tangent_geoms: tangents, key_vertices: key_verts, fill_tris: vec![] }
 }
 
 fn to_truck(pline: &LwPolyline) -> TruckEntity {
@@ -117,6 +117,7 @@ fn to_truck(pline: &LwPolyline) -> TruckEntity {
             snap_pts: vec![],
             tangent_geoms: vec![],
             key_vertices: vec![],
+            fill_tris: vec![],
         };
     }
 
@@ -237,6 +238,7 @@ fn to_truck(pline: &LwPolyline) -> TruckEntity {
             snap_pts: vec![],
             tangent_geoms: tgs,
             key_vertices: kv,
+            fill_tris: vec![],
         };
     }
 
@@ -305,6 +307,7 @@ fn to_truck(pline: &LwPolyline) -> TruckEntity {
         snap_pts: vec![],
         tangent_geoms: tangents,
         key_vertices: key_verts,
+        fill_tris: vec![],
     }
 }
 

src/entities/mesh.rs

@@ -64,6 +64,7 @@ impl TruckConvertible for Face3D {
             ],
             tangent_geoms: vec![],
             key_vertices: vec![p0, p1, p2, p3],
+            fill_tris: vec![],
         })
     }
 }
@@ -182,9 +183,9 @@ impl TruckConvertible for PolygonMesh {
         };
 
         let mut pts: Vec<[f32; 3]> = Vec::new();
+        let mut fill_tris: Vec<[f32; 3]> = Vec::new();
 
         // Rows (M direction).
-        let m_end = if closed_m { m } else { m - 1 };
         for i in 0..m {
             pts.push([f32::NAN; 3]);
             for j in 0..n {
@@ -196,7 +197,6 @@ impl TruckConvertible for PolygonMesh {
         }
 
         // Columns (N direction).
-        let n_end = if closed_n { n } else { n - 1 };
         for j in 0..n {
             pts.push([f32::NAN; 3]);
             for i in 0..m {
@@ -206,13 +206,26 @@ impl TruckConvertible for PolygonMesh {
                 pts.push(pt(0, j));
             }
         }
-        let _ = (m_end, n_end); // suppress warnings
+
+        // Fill: triangulate each grid quad (two triangles per cell).
+        let mi = if closed_m { m } else { m - 1 };
+        let ni = if closed_n { n } else { n - 1 };
+        for i in 0..mi {
+            for j in 0..ni {
+                let p00 = pt(i, j);
+                let p10 = pt((i + 1) % m, j);
+                let p01 = pt(i, (j + 1) % n);
+                let p11 = pt((i + 1) % m, (j + 1) % n);
+                fill_tris.extend_from_slice(&[p00, p10, p11, p00, p11, p01]);
+            }
+        }
 
         Some(TruckEntity {
             object: TruckObject::Lines(pts),
             snap_pts: vec![],
             tangent_geoms: vec![],
             key_vertices: vec![],
+            fill_tris,
         })
     }
 }
@@ -294,6 +307,7 @@ impl TruckConvertible for PolyfaceMesh {
         };
 
         let mut pts: Vec<[f32; 3]> = Vec::new();
+        let mut fill_tris: Vec<[f32; 3]> = Vec::new();
 
         for face in &self.faces {
             // Indices: 0 means unused. Negative = invisible edge (still render for wireframe).
@@ -313,6 +327,15 @@ impl TruckConvertible for PolyfaceMesh {
             }
             // Close the face polygon.
             pts.push(verts[0]);
+
+            // Fan-triangulate the face for solid fill.
+            if verts.len() >= 3 {
+                for i in 1..(verts.len() - 1) {
+                    fill_tris.push(verts[0]);
+                    fill_tris.push(verts[i]);
+                    fill_tris.push(verts[i + 1]);
+                }
+            }
         }
 
         Some(TruckEntity {
@@ -320,6 +343,7 @@ impl TruckConvertible for PolyfaceMesh {
             snap_pts: vec![],
             tangent_geoms: vec![],
             key_vertices: vec![],
+            fill_tris,
         })
     }
 }

src/entities/mline.rs

@@ -109,6 +109,7 @@ impl TruckConvertible for MLine {
             snap_pts,
             tangent_geoms: vec![],
             key_vertices: key_verts,
+            fill_tris: vec![],
         })
     }
 }

src/entities/mtext.rs

@@ -177,6 +177,7 @@ fn to_truck(t: &MText, document: &acadrust::CadDocument) -> TruckEntity {
         snap_pts: vec![(insertion, SnapHint::Insertion)],
         tangent_geoms: vec![],
         key_vertices: vec![],
+        fill_tris: vec![],
     }
 }
 

src/entities/multileader.rs

@@ -156,6 +156,7 @@ fn to_truck(ml: &MultiLeader, document: &acadrust::CadDocument) -> Option<TruckE
         snap_pts,
         tangent_geoms: tangents,
         key_vertices: key_verts,
+        fill_tris: vec![],
     })
 }
 

src/entities/ole2frame.rs

@@ -22,6 +22,7 @@ fn to_truck(ole: &Ole2Frame) -> TruckEntity {
             snap_pts: vec![],
             tangent_geoms: vec![],
             key_vertices: vec![],
+            fill_tris: vec![],
         };
     }
 
@@ -42,6 +43,7 @@ fn to_truck(ole: &Ole2Frame) -> TruckEntity {
         snap_pts: vec![(center, SnapHint::Center)],
         tangent_geoms: vec![],
         key_vertices: vec![[x0, y0, z], [x1, y1, z]],
+        fill_tris: vec![],
     }
 }
 

src/entities/point.rs

@@ -22,6 +22,7 @@ fn to_truck(pt: &Point) -> TruckEntity {
         snap_pts: vec![(snap, SnapHint::Node)],
         tangent_geoms: vec![],
         key_vertices: vec![],
+        fill_tris: vec![],
     }
 }
 

src/entities/polyline.rs

@@ -31,6 +31,7 @@ fn tessellate_polyline(pl: &Polyline) -> TruckEntity {
         snap_pts: vec![],
         tangent_geoms: vec![],
         key_vertices: key_verts,
+        fill_tris: vec![],
     }
 }
 
@@ -127,6 +128,7 @@ fn tessellate_polyline2d(pl: &Polyline2D) -> TruckEntity {
             snap_pts: vec![],
             tangent_geoms: vec![],
             key_vertices: vec![],
+            fill_tris: vec![],
         };
     }
 
@@ -204,7 +206,7 @@ fn tessellate_polyline2d(pl: &Polyline2D) -> TruckEntity {
                 if i + 1 < kv.len() { pts.push([f32::NAN; 3]); }
             }
         }
-        return TruckEntity { object: TruckObject::Lines(pts), snap_pts: vec![], tangent_geoms: tgs, key_vertices: kv };
+        return TruckEntity { object: TruckObject::Lines(pts), snap_pts: vec![], tangent_geoms: tgs, key_vertices: kv, fill_tris: vec![] };
     }
 
     for i in 0..seg_count {
@@ -271,6 +273,7 @@ fn tessellate_polyline2d(pl: &Polyline2D) -> TruckEntity {
         snap_pts: vec![],
         tangent_geoms: tangents,
         key_vertices: key_verts,
+        fill_tris: vec![],
     }
 }
 
@@ -397,6 +400,7 @@ fn tessellate_polyline3d(pl: &Polyline3D) -> TruckEntity {
         snap_pts: vec![],
         tangent_geoms: vec![],
         key_vertices: key_verts,
+        fill_tris: vec![],
     }
 }
 

src/entities/raster_image.rs

@@ -129,6 +129,7 @@ impl TruckConvertible for RasterImage {
             snap_pts: vec![],
             tangent_geoms: vec![],
             key_vertices: corners.to_vec(),
+            fill_tris: vec![],
         })
     }
 }
@@ -289,6 +290,7 @@ impl TruckConvertible for Wipeout {
             snap_pts: vec![],
             tangent_geoms: vec![],
             key_vertices: corners.to_vec(),
+            fill_tris: vec![],
         })
     }
 }

src/entities/ray.rs

@@ -34,6 +34,7 @@ impl TruckConvertible for Ray {
             snap_pts: vec![],
             tangent_geoms: vec![],
             key_vertices: vec![start],
+            fill_tris: vec![],
         })
     }
 }
@@ -165,6 +166,7 @@ impl TruckConvertible for XLine {
             snap_pts: vec![],
             tangent_geoms: vec![],
             key_vertices: vec![[bp.x as f32, bp.y as f32, bp.z as f32]],
+            fill_tris: vec![],
         })
     }
 }

src/entities/shape.rs

@@ -47,6 +47,7 @@ impl TruckConvertible for Shape {
             snap_pts: vec![(snap_pt, SnapHint::Insertion)],
             tangent_geoms: vec![],
             key_vertices: vec![[ox, oy, oz]],
+            fill_tris: vec![],
         })
     }
 }

src/entities/solid.rs

@@ -47,6 +47,7 @@ impl TruckConvertible for Solid {
             snap_pts: snap,
             tangent_geoms: vec![],
             key_vertices: vec![p0, p1, p2, p3],
+            fill_tris: vec![],
         })
     }
 }

src/entities/spline.rs

@@ -19,6 +19,7 @@ fn to_truck(spl: &Spline) -> TruckEntity {
             snap_pts: vec![],
             tangent_geoms: vec![],
             key_vertices: vec![],
+            fill_tris: vec![],
         };
     }
 
@@ -92,6 +93,7 @@ fn to_truck(spl: &Spline) -> TruckEntity {
         snap_pts: vec![],
         tangent_geoms: vec![],
         key_vertices,
+        fill_tris: vec![],
     }
 }
 

src/entities/table.rs

@@ -137,6 +137,7 @@ impl TruckConvertible for Table {
             snap_pts: vec![(origin, SnapHint::Insertion)],
             tangent_geoms: vec![],
             key_vertices: vec![],
+            fill_tris: vec![],
         })
     }
 }

src/entities/text.rs

@@ -125,6 +125,7 @@ fn to_truck(t: &Text, document: &acadrust::CadDocument) -> TruckEntity {
         snap_pts: vec![(snap_pt, SnapHint::Insertion)],
         tangent_geoms: vec![],
         key_vertices: vec![],
+        fill_tris: vec![],
     }
 }
 

src/entities/tolerance.rs

@@ -236,6 +236,7 @@ impl TruckConvertible for Tolerance {
             snap_pts: vec![(snap_pt, SnapHint::Insertion)],
             tangent_geoms: vec![],
             key_vertices: vec![],
+            fill_tris: vec![],
         })
     }
 }

src/entities/underlay.rs

@@ -56,6 +56,7 @@ impl TruckConvertible for Underlay {
                 snap_pts: vec![(Vec3::from(origin), SnapHint::Node)],
                 tangent_geoms: vec![],
                 key_vertices: key,
+                fill_tris: vec![],
             })
         } else {
             // No clip boundary: draw a cross at insertion point.
@@ -65,6 +66,7 @@ impl TruckConvertible for Underlay {
                 snap_pts: vec![(Vec3::from(origin), SnapHint::Node)],
                 tangent_geoms: vec![],
                 key_vertices: vec![origin],
+                fill_tris: vec![],
             })
         }
     }