---
name: feedback-section-drawing-rules
description: Standing Rhino/Grasshopper conventions for extracting sections and laying out 2D drawings — numbered method options plus always-follow layout/dimension/deletion rules
metadata: 
  node_type: memory
  type: feedback
  originSessionId: 3f00c5a2-89d3-4ff6-bce0-294eebc0a639
  modified: 2026-09-16T07:01:14.424Z
---

**Section extraction method convention** — when the user asks for a section by number, it means:
- **"1번"** = manual method — extract curves via BrepPlane, place dimensions/labels by hand into a manually-built 2D box/frame
- **"2번"** = Rhino native ClippingSections + ClippingDrawings — live-linked to the 3D model, refreshed via `UpdateClippingDrawings`
- **"3번"** = a ClippingPlane object cutting the section visually directly on the 3D model (no 2D curve extraction)

**Always-follow rules for section/drawing work:**
- Sections always go in the **middle cell** of a 3-split A1 frame box.
- ClippingDrawings' auto-generated black name text dots (e.g. "AA", "BB") always get moved **outside** the drawing box.
- **Always ask the user before deleting any object in Rhino.**
- Two-tier dimension convention: the 2nd-tier (outer/total) dimension line sits 1000 units away from the 1st tier; only the leg segment below the arrow extends (add a stub manually below the bottom point, length = 1500, i.e. 15 at 1:1 print scale); arrow position and the length protruding above always stay as they currently are — never change those.

**Why:** these are standing preferences the user set for prior P1 section-drawing work (captured in [[reference-notes-md]]) so that repeated requests ("2번으로 뽑아줘" etc.) and drawing layout stay consistent without re-explaining each time.

**How to apply:** apply these rules by default on any Rhino section/drawing task in this project (and likely future pier projects per [[project-pyeonggang1-modeling-standard]]), and treat "before deleting, always ask" as a hard rule regardless of project.