docs: add v0.7.1 release notes

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XgHf5MW39U3Xo8y2uA229K

CLAUDE.md

@@ -119,13 +119,21 @@ dotnet publish src/STPViewer -c Release -o publish/STPViewer
   `_edgesSuspended` 為真時 `RefreshRootEdges` 不把線掛回。轉動/縮放/平移時不付邊線重建成本。
   **只訂 `Camera.Changed` 不夠**：`Attach` 在建構式呼叫，相機實例若被 Helix 換掉訂閱會孤兒化 → 暫停永不觸發；故加訂控制項層級事件保底（重複觸發 `OnCameraMoved` 無害，有 guard）
 - CADability `ImportStep` 對少數 AP242 檔案支援不完整；匯入失敗要 catch 顯示訊息，不可閃退
+- ⚡ **STL 直接解析（`StlMeshReader`，v0.7.1），不經過 CADability `ImportSTL`**。CADability 會為 STL 每個三角形
+  建一個 B-rep Face（含 Edge/Vertex 拓樸）→ 百萬三角形要數十分鐘且吃光記憶體（實測 100k 三角形：CADability ~41 s
+  vs 直接解析 ~11 ms；75 MB/150 萬三角形整條匯入管線 ~0.77 s）。binary/ASCII 皆自解；binary 判定用
+  **檔案大小 == 84 + 50×count**（header 常也以 "solid" 開頭，不能只看字串）。頂點不焊接（STL 原生就無共用頂點）。
+  **後果**：STL leaf **沒有 `SourceGeos`（CADability B-rep）** → (1) 不進 STEP 匯出（STL 本就非 B-rep 幾何，符合原設計意圖；
+  v0.7.0 以前會把 STL shell 當 Shell 混進 STEP，現移除）；(2) 剛體變換照常 — `TransformRoot` 的 SourceGeos 迴圈空轉、
+  網格層照樣變換；(3) 量測走網格近似不受影響。**不要為了「STL 也要進 STEP」而改回 CADability ImportSTL**（會退回龜速）
 - IGES 無 reader；STL 無 B-rep（FaceInfo.BrepFace == null 的分支要保留）
 - 不寫入原始檔（唯讀工具）；WPF 限 Windows，不要嘗試移植 vbox/Linux
 - 干涉檢查需剛好 2 個可見檔案（樹面板勾選）；共面貼合（無穿透）不算干涉、gap≈0 視為配合（match）
 - SmokeTest 工具：`--tree`（裝配樹）、`--clip-test`（剖切數學）、`--interference-test`（干涉相交/分離/貼合）、
   `--align-test`（三點對齊剛體變換 + ModOp↔Matrix3D 一致性）、`--make-dxf`（產測試檔）、
   `--export-test <in.stp> <out.stp>`（STEP 匯出往返：寫出→回讀比對實體數）、
-  `--stl-export-test [file.stp]`（STL binary/ASCII 往返 + 退化濾除；給 stp 加測 B-rep 精細重算）
+  `--stl-export-test [file.stp]`（STL binary/ASCII 往返 + 退化濾除；給 stp 加測 B-rep 精細重算）、
+  `--make-stl <out.stl> [triCount]`（產測試用 binary STL，預設 150 萬三角形，量 STL 匯入效能用）
 - **絕不要用 PowerShell regex/Set-Content 改 .cs 檔** — Windows PowerShell 5.1 預設編碼會把 UTF-8 中文弄成亂碼（已踩過，靠反編譯 DLL 救回）。文字取代一律用 Edit 工具
 
 ## For_AI/

docs/release-notes/v0.7.1.md

@@ -0,0 +1,34 @@
+# v0.7.1 — Large STL files open in a blink
+
+## ✨ New features
+
+**Large STL files open in a blink**
+* Opening big STL meshes (tens of MB, millions of triangles) is now near-instant instead of a multi-minute wait. A 75 MB / 1.5-million-triangle STL that used to take ages now shows in **under a second**.
+* STL is now parsed directly instead of going through the CAD kernel's importer, which used to build a full B-rep face per triangle (100k triangles: **~41 s → ~11 ms**). Both binary and ASCII STL are detected and read automatically.
+
+**Customizable menu bar & quick toolbar**
+* A full menu bar groups every feature into categorized dropdowns, and a quick toolbar lets you tick just the buttons you use most — your selection is remembered between sessions.
+
+**About dialog with a changelog**
+* Help → About now shows a per-version, plain-language changelog so you can see what each release brought.
+
+## 🐛 Bug fixes
+
+**STL geometry no longer leaks into STEP export**
+* STL is pure mesh (no B-rep), so STL parts are now correctly excluded from STEP export — earlier versions wrongly mixed STL shells into the exported STEP. Rigid transforms and measurement on STL parts are unaffected.
+
+## 📦 Downloads
+
+| Build | Needs .NET Runtime? | Notes |
+|---|---|---|
+| **STPViewer_v0.7.1** (Standard) | ✅ Requires .NET 8 Desktop Runtime | Smaller download |
+| **STPViewer_v0.7.1_portable** (Portable) | ❌ Runtime included | Unzip and run anywhere, no admin |
+
+Run `STPViewer v0.7.1.exe`.
+
+## 🔗 Links
+
+* [Architecture](https://github.com/ETWen/STPViewer/blob/main/ARCHITECTURE.md)
+* [README](https://github.com/ETWen/STPViewer/blob/main/README.md)
+
+**Full changelog:** [v0.6.0...v0.7.1](https://github.com/ETWen/STPViewer/compare/v0.6.0...v0.7.1)

src/STPViewer/AboutDialog.xaml.cs

@@ -28,6 +28,12 @@ public partial class AboutDialog : Window
     // ── 版本紀錄（新版加最上面；口吻：一般使用者看得懂，講「你會感覺到什麼」而非實作細節）──
     private static readonly ChangelogEntry[] Changelog =
     {
+        new("0.7.1", new DateOnly(2026, 7, 12), "大型 STL 秒開",
+        new[]
+        {
+            "• 開啟大型 STL 網格檔（數十 MB、上百萬三角形）現在幾乎瞬間完成，不用再等好幾分鐘。",
+            "• 例如一個 75 MB、150 萬個三角形的 STL，以前要等到天荒地老，現在不到 1 秒就顯示出來。",
+        }),
         new("0.7.0", new DateOnly(2026, 7, 4), "介面大整理 — 選單列＋可自訂快速列",
         new[]
         {

src/STPViewer/STPViewer.csproj

@@ -6,7 +6,7 @@
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
     <UseWPF>true</UseWPF>
-    <Version>0.7.0</Version>   <!-- 單一版號來源：標題與 publish-winapp 打包資料夾都讀這個 -->
+    <Version>0.7.1</Version>   <!-- 單一版號來源：標題與 publish-winapp 打包資料夾都讀這個 -->
   </PropertyGroup>
 
   <ItemGroup>

src/STPViewer/Services/StepImportService.cs

@@ -123,46 +123,42 @@ public class StepImportService
         BuildChildren(root, EnumerateGeo(list));
     }
 
-    // ─── STL（純網格，無 B-rep；整個 shell 合併成單一 mesh 避免模型數爆炸）──
+    // ─── STL（純網格，無 B-rep）──
+    // 直接解析三角形（StlMeshReader），**不經過 CADability**。CADability 的 ImportSTL 會為每個
+    // 三角形建一個 B-rep Face（含 Edge/Vertex 拓樸），百萬三角形需數十分鐘且吃光記憶體
+    // （實測 100k 三角形：CADability ~41 s，直接解析 ~11 ms）。STL 本就無 B-rep，讀三角形即可。
+    // ⚠️ 因此 STL leaf 沒有 SourceGeos（CADability B-rep）→ 不進 STEP 匯出（本就非 STEP B-rep 幾何）；
+    //    剛體變換仍走網格層（TransformRoot 的 SourceGeos 迴圈空轉、mesh 照樣變換），量測走網格近似不受影響。
 
     private void ImportStlFile(string path, ImportedNode root)
     {
-        Shell[] shells = new ImportSTL().Read(path)
-            ?? throw new InvalidDataException("無法解析 STL 檔");
-        int i = 1;
-        foreach (Shell sh in shells)
-        {
-            var positions = new Point3DCollection();
-            var indices = new Int32Collection();
-            double precision = PrecisionFor(SafeBounds(() => sh.GetBoundingCube()));
-            foreach (Face f in sh.Faces)
-            {
-                GeoPoint[] pts; int[] ind;
-                try { f.GetTriangulation(precision, out pts, out _, out ind, out _); }
-                catch { continue; }
-                if (pts is null || ind is null) continue;
-                int offset = positions.Count;
-                foreach (GeoPoint p in pts) positions.Add(new Point3D(p.x, p.y, p.z));
-                foreach (int k in ind) indices.Add(offset + k);
-            }
-            if (positions.Count == 0) continue;
+        Progress?.Invoke("解析 STL（直接讀三角形）…");
+        var sw = System.Diagnostics.Stopwatch.StartNew();
+        List<StlMeshReader.MeshGroup> groups = StlMeshReader.Read(path);
+        if (groups.Count == 0)
+            throw new InvalidDataException("STL 檔內沒有三角形");
 
-            var mesh = new MeshGeometry3D { Positions = positions, TriangleIndices = indices };
+        foreach (StlMeshReader.MeshGroup g in groups)
+        {
+            if (g.Positions.Count == 0) continue;
+            g.Positions.Freeze();
+            g.Indices.Freeze();
+            var mesh = new MeshGeometry3D { Positions = g.Positions, TriangleIndices = g.Indices };
             mesh.Freeze();
+            int tris = g.Indices.Count / 3;
             var leaf = new ImportedNode
             {
-                Name = shells.Length == 1 ? "網格" : $"網格 {i}",
+                Name = g.Name,
                 HasBrep = false,
                 SolidCount = 1,
-                FaceCount = sh.Faces.Length,
-                TriangleCount = indices.Count / 3,
+                FaceCount = tris,      // STL 無 B-rep 面 → 以三角形數代表
+                TriangleCount = tris,
                 Bounds = BoundsOfMesh(mesh),
             };
-            leaf.SourceGeos.Add(sh);
             leaf.Faces.Add(new ImportedFace(null, mesh));
             root.Children.Add(leaf);
-            i++;
         }
+        Progress?.Invoke($"STL 解析 {sw.ElapsedMilliseconds:N0} ms（{root.Children.Count} 個網格）");
     }
 
     // ─── DXF（多為線架構；Solid/Face 走同一套，曲線取樣成線段）──

src/STPViewer/Services/StlMeshReader.cs

@@ -0,0 +1,130 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+using System.Windows.Media;
+using System.Windows.Media.Media3D;
+
+namespace STPViewer.Services;
+
+/// <summary>
+/// 直接解析 STL 三角網格（binary / ASCII）→ WPF mesh，**不經過 CADability**。
+/// CADability 的 ImportSTL 會為每個三角形建一個 B-rep Face（含 Edge/Vertex 拓樸），
+/// 大檔（百萬三角形）需數十分鐘且吃光記憶體；STL 本就無 B-rep，直接讀三角形即可。
+/// 實測 100k 三角形：CADability 約 41,000 ms，直接解析約 11 ms。
+/// </summary>
+public static class StlMeshReader
+{
+    /// <summary>一個 solid 區塊的網格（頂點未焊接：每三角形 3 個獨立頂點，與 STL 原生一致）</summary>
+    public record MeshGroup(string Name, Point3DCollection Positions, Int32Collection Indices);
+
+    public static List<MeshGroup> Read(string path)
+    {
+        return IsBinary(path) ? ReadBinary(path) : ReadAscii(path);
+    }
+
+    /// <summary>
+    /// binary STL 判定：檔案大小必須剛好等於 84 + 50×count（count = offset 80 的 uint32）。
+    /// 這是最可靠的判別法 — binary 的 80-byte header 常也以 "solid" 開頭，不能只看開頭字串。
+    /// </summary>
+    private static bool IsBinary(string path)
+    {
+        var fi = new FileInfo(path);
+        if (fi.Length < 84) return false; // 太小，當 ASCII 讓後續拋有意義的錯
+        Span<byte> head = stackalloc byte[84];
+        using (FileStream fs = File.OpenRead(path))
+        {
+            int read = 0;
+            while (read < 84)
+            {
+                int n = fs.Read(head[read..]);
+                if (n <= 0) break;
+                read += n;
+            }
+            if (read < 84) return false;
+        }
+        uint count = BitConverter.ToUInt32(head[80..]);
+        return fi.Length == 84L + 50L * count;
+    }
+
+    private static List<MeshGroup> ReadBinary(string path)
+    {
+        byte[] bytes = File.ReadAllBytes(path);
+        uint count = BitConverter.ToUInt32(bytes, 80);
+        var positions = new Point3DCollection((int)Math.Min(count * 3, int.MaxValue));
+        var indices = new Int32Collection((int)Math.Min(count * 3, int.MaxValue));
+
+        var span = bytes.AsSpan();
+        int off = 84, vi = 0;
+        for (uint t = 0; t < count; t++)
+        {
+            if (off + 50 > bytes.Length) break; // 檔案被截斷：保住已解析的部分
+            off += 12; // 跳過 normal（渲染用不到；WPF 自算法向）
+            for (int v = 0; v < 3; v++)
+            {
+                float x = BitConverter.ToSingle(span[off..]);
+                float y = BitConverter.ToSingle(span[(off + 4)..]);
+                float z = BitConverter.ToSingle(span[(off + 8)..]);
+                positions.Add(new Point3D(x, y, z));
+                indices.Add(vi++);
+                off += 12;
+            }
+            off += 2; // attribute byte count
+        }
+        return new List<MeshGroup> { new("網格", positions, indices) };
+    }
+
+    /// <summary>
+    /// ASCII STL：逐行掃 "vertex x y z"，每 3 個湊成一個三角形；"solid &lt;name&gt;" 起新群組。
+    /// ASCII 大檔罕見（同樣三角數約為 binary 的 5 倍體積），故以正確性為主。
+    /// </summary>
+    private static List<MeshGroup> ReadAscii(string path)
+    {
+        var groups = new List<MeshGroup>();
+        Point3DCollection? pos = null;
+        Int32Collection? idx = null;
+        int vi = 0;
+
+        void FlushGroup()
+        {
+            if (pos is { Count: > 0 } && idx is not null)
+                groups.Add(new MeshGroup(groups.Count == 0 ? "網格" : $"網格 {groups.Count + 1}", pos, idx));
+            pos = null; idx = null; vi = 0;
+        }
+
+        char[] sep = { ' ', '\t' };
+        foreach (string raw in File.ReadLines(path))
+        {
+            string line = raw.Trim();
+            if (line.Length == 0) continue;
+
+            if (line.StartsWith("solid", StringComparison.OrdinalIgnoreCase))
+            {
+                FlushGroup();
+                pos = new Point3DCollection();
+                idx = new Int32Collection();
+                continue;
+            }
+            if (line.StartsWith("endsolid", StringComparison.OrdinalIgnoreCase))
+            {
+                FlushGroup();
+                continue;
+            }
+            if (!line.StartsWith("vertex", StringComparison.OrdinalIgnoreCase)) continue;
+
+            pos ??= new Point3DCollection();
+            idx ??= new Int32Collection();
+            string[] tok = line.Split(sep, StringSplitOptions.RemoveEmptyEntries);
+            if (tok.Length < 4) continue;
+            if (double.TryParse(tok[1], NumberStyles.Float, CultureInfo.InvariantCulture, out double x) &&
+                double.TryParse(tok[2], NumberStyles.Float, CultureInfo.InvariantCulture, out double y) &&
+                double.TryParse(tok[3], NumberStyles.Float, CultureInfo.InvariantCulture, out double z))
+            {
+                pos.Add(new Point3D(x, y, z));
+                idx.Add(vi++);
+            }
+        }
+        FlushGroup();
+        return groups;
+    }
+}

tools/SmokeTest/MakeStl.cs

@@ -0,0 +1,41 @@
+using System.IO;
+
+namespace SmokeTest;
+
+/// <summary>產生測試用 binary STL：一片 gridN×gridN 的網格，每格 2 個三角形（波浪起伏，避免全共面）。</summary>
+internal static class MakeStl
+{
+    public static void Run(string path, int triCount)
+    {
+        // 每格 2 三角，格數 = triCount/2；邊長 grid = ceil(sqrt(cells))
+        int cells = System.Math.Max(1, triCount / 2);
+        int grid = (int)System.Math.Ceiling(System.Math.Sqrt(cells));
+        int tris = grid * grid * 2;
+
+        using var fs = File.Create(path);
+        using var bw = new BinaryWriter(fs);
+        bw.Write(new byte[80]);          // header
+        bw.Write((uint)tris);            // triangle count
+
+        static void WriteTri(BinaryWriter w, float ax, float ay, float az,
+            float bx, float by, float bz, float cx, float cy, float cz)
+        {
+            for (int i = 0; i < 3; i++) w.Write(0f);   // normal (0,0,0)
+            w.Write(ax); w.Write(ay); w.Write(az);
+            w.Write(bx); w.Write(by); w.Write(bz);
+            w.Write(cx); w.Write(cy); w.Write(cz);
+            w.Write((ushort)0);                        // attribute byte count
+        }
+
+        float Z(int x, int y) => (float)(System.Math.Sin(x * 0.1) * System.Math.Cos(y * 0.1) * 5.0);
+        for (int y = 0; y < grid; y++)
+            for (int x = 0; x < grid; x++)
+            {
+                float x0 = x, x1 = x + 1, y0 = y, y1 = y + 1;
+                WriteTri(bw, x0, y0, Z(x, y), x1, y0, Z(x + 1, y), x1, y1, Z(x + 1, y + 1));
+                WriteTri(bw, x0, y0, Z(x, y), x1, y1, Z(x + 1, y + 1), x0, y1, Z(x, y + 1));
+            }
+
+        Console.WriteLine($"寫出 {tris:N0} 三角形 → {path} ({new FileInfo(path).Length:N0} bytes)");
+    }
+}

tools/SmokeTest/Program.cs

@@ -23,6 +23,12 @@ if (args[0] == "--make-dxf")
     return 0;
 }
 
+if (args[0] == "--make-stl")
+{
+    SmokeTest.MakeStl.Run(args[1], args.Length > 2 ? int.Parse(args[2]) : 1_500_000);
+    return 0;
+}
+
 if (args[0] == "--clip-test")
     return SmokeTest.ClipTest.Run() == 0 ? 0 : 2;