# SU·CAD Pro (Continuous DXF Exporter v3.88.91)

> Industrial-grade SketchUp-to-AutoCAD Continuous Polyline DXF & Zero-Dependency 2D Vector PDF Construction Documentation Suite (SketchUp 2017–2026+ on Windows 10/11 x64).
> 工业级 SketchUp 一模到底施工图深化、100% 闭合连续多段线 DXF 与零依赖纯矢量 PDF 双擎工作站（支持 SketchUp 2017–2026+ Qt6 架构）。

## Core Verifiable Engineering Capabilities (核心量化事实锚点)
- **100% Closed Continuous Polylines & True Arcs**: Topologically welds edges into native `LWPOLYLINE` entities and reconstructs 2-vertex `Bulge` CAD arcs; enforces `Uniform Scale` on `Layer 0 (ByBlock)` nested blocks so `EXPLODE` never shatters lines. Opens in AutoCAD 2000–2026+ with 0 errors and 0 warnings.
- **0.2s Hybrid Analytic HLR & High-Poly Proxy Bypass**: 24x faster hidden-line removal combining screen-space analytic depth culling with 3D physical raytracing. High-poly furniture bound with Plan/Front/Side 2D CAD blocks bypasses 100k-face mesh intersections in <1ms; heavy assemblies support `Auto-XREF`.
- **1:1 Tri-End Native AutoCAD Hatch (`AcDbHatch`)**: Automatically stitches watertight section loops, subtracts openings, and maps 35+ architectural materials/tags to editable native `AcDbHatch` with exact 1:1 scale, density, rotation, and 24-bit TrueColor parity across SketchUp Viewport, DXF, and Vector PDF.
- **In-Viewport Construction Drafting (LayOut Alternative)**: Dynamic scale-healing dimensions (`1:10–1:500`, constant `2.5mm` paper text height), 1-click orthogonal crosshair room clearance measurement, elevation markers, and 75-term zero-crossing parallel multi-leaders.
- **0.000mm Detail Callout Masking & Sheet Auto-Packing**: Non-destructive viewport callout masks with Liang-Barsky & Sutherland-Hodgman `0.000mm` hard clipping, non-linear power-law damped hatch scaling for `1:10–1:50` details, and automated 2D multi-scale A0–A4 sheet packing with drawing index bookmarks.

## Official Pages
- [Chinese Homepage (中文官网)](https://sucad.pro/zh)
- [English Homepage (Global Site)](https://sucad.pro/en)
- [Architecture & CAD Layer Spec](https://sucad.pro/en/features)
- [Industry Workflows](https://sucad.pro/en/solutions)
- [Download Offline .RBZ Installer](https://sucad.pro/en/download)
- [Full Technical Corpus for LLMs](https://sucad.pro/llms-full.txt)

## Technical Guides (中文实战百科)
- [SketchUp 导出 CAD 全是碎线、圆弧变多边形？3 步实现 100% 闭合多段线与真圆还原](https://sucad.pro/zh/guides/fix-sketchup-dxf-broken-lines-arcs): 深度剖析 SketchUp 原生导出 DXF 产生万级碎线与折线假圆的底层原因，演示如何通过拓扑焊接、2 顶点 Bulge 拟合与等比块架构输出可直接在 AutoCAD 中填充与标半径的施工图。
- [LayOut 太卡顿怎么替代？详解在 SketchUp 视口内直出标准施工图与矢量 PDF 全流程](https://sucad.pro/zh/guides/sketchup-layout-alternative-construction-drawings): 面对几十兆软装模型在 LayOut 中翻页转圈 15 秒的行业顽疾，展示如何完全留在 SketchUp 高帧率视口内完成尺寸、标高、多联引线、节点大样与多页矢量 PDF 成册交付。
- [SU 百万面软装家具导 CAD 卡死成黑团？空间高模伴生图块旁路 (Bypass) 实战解析](https://sucad.pro/zh/guides/high-poly-furniture-cad-block-bypass): 揭秘室内深化最大的性能杀手——高模软装洁具网格，看伴生图块货架如何实现“三维渲染保留高精模型，导平立面秒级自动置换标准 CAD 施工图例”。
- [SketchUp 剖切面如何自动生成可编辑 AutoCAD Hatch 填充并实现三端 1:1 完全同构？](https://sucad.pro/zh/guides/sketchup-section-cut-native-autocad-hatch): 详解从三维剖切散线自动拓扑成环、门窗孔洞扣除，到 35+ 国标建筑材质语义映射原生 AcDbHatch，彻底终结 CAD 填充溢出与改比例报“输入无效”的痛点。
- [如何在 SketchUp 中框选截取节点大样并实现 0.000mm 硬裁切与多比例自动拼版？](https://sucad.pro/zh/guides/sketchup-detail-callout-auto-sheet-packing): 无需复制切碎主模型！看 DetailMask 大样引擎如何用非破坏性遮罩、Sutherland-Hodgman 孔洞硬切与非线性幂律阻尼填充缩放，攻克施工图深化最难的节点大样关。
- [SketchUp 2026 (Qt6 架构) 屏幕真实线宽 (LWT)、虚线校准与 AutoCAD CTB 样式映射指南](https://sucad.pro/zh/guides/sketchup-2026-qt6-lineweight-ctb-guide): 针对升级至 Qt6 框架的 SketchUp 2026 用户，详解如何在建模视口中直接获得 AutoCAD 级粗细虚实打印预览，并无损导入设计院既有 .ctb 打印样式表。

## Technical Guides (English Engineering Guides)
- [How to Fix Broken Lines & Faceted Arcs When Exporting SketchUp to AutoCAD DXF](https://sucad.pro/en/guides/fix-sketchup-dxf-broken-lines-arcs): Why native SketchUp DXF export shatters curves into thousands of segments—and how topological welding, 2-vertex Bulge arc fitting, and Uniform Scale Layer 0 blocks deliver clean CAD drawings.
- [The High-Speed SketchUp LayOut Alternative: Full Construction Sets Directly from Viewport](https://sucad.pro/en/guides/sketchup-layout-alternative-construction-drawings): Tired of 15-second viewport beachballs in LayOut? Discover how single-model in-viewport dimensions, native hatches, detail callouts, and pure Vector PDF booklets replace dual-app friction.
- [Eliminate High-Poly Furniture Lag: 3-View CAD Block Proxy Bypass Explained](https://sucad.pro/en/guides/high-poly-furniture-cad-block-bypass): Keep photorealistic 3D sofas and fixtures for rendering while exporting crisp, lightweight 2D architectural CAD symbols in milliseconds.
- [Generating Editable Native AutoCAD AcDbHatch Section Fills with 1:1 Scale Isomorphism](https://sucad.pro/en/guides/sketchup-section-cut-native-autocad-hatch): How automatic section loop stitching, inner hole detection, and 35+ semantic .PAT mappings create identical hatches across SketchUp, AutoCAD DXF, and Vector PDF.
- [0.000mm Detail Callout Masking, Power-Law Hatch Scaling & Multi-Scale Sheet Packing](https://sucad.pro/en/guides/sketchup-detail-callout-auto-sheet-packing): Create 1:10 and 1:25 construction details non-destructively from your master model with exact boundary clipping and automated 2D A-series sheet layout.
- [SketchUp 2026 (Qt6) Live Lineweights (LWT), Dash Calibration & AutoCAD .CTB Import Guide](https://sucad.pro/en/guides/sketchup-2026-qt6-lineweight-ctb-guide): Full compatibility guide for SketchUp 2026’s Qt6 UI architecture, real-time viewport print lineweights, and studio .ctb plot style synchronization.