Section Toolbox (STB)

Description

Section Toolbox adds parametric section boxes and planar sections to Blender with live controls, per-axis anchors, and clean 2D exports (SVG/DXF). Generate cut and projection/elevation lines that are occlusion-aware (near geometry hides far geometry), plus filled cut faces for closed loops. Each run is versioned into tidy, nested collections, and exports are view-aligned with optional Flip X/Y.

Core workflow:

• Box: Fit a box to the current selection → live Width/Depth/Height, Move, Rotate → pick a face (±X/±Y/±Z) → generate _cut + _projection → export SVG/DXF.
• Plane: Create XY/XZ/YZ plane → choose Direction (+N/−N) & Depth (slab) → live Size U/V with anchors → generate elevation → export SVG/DXF.

Exports:

• SVG: thin strokes (0.25) + filled polygons for closed cuts.
• DXF: pure 2D LINE entities at Z=0, view-aligned by a saved Frame2D (use Flip X/Y to match your drawing convention).

Features

Section Box

• One-click box that fits the current selection (evaluated bounds; modifiers included).
• Anchors per axis (Center / − / +) to pin faces while resizing.
• Live Width / Depth / Height, Move, and Rotate (no apply step).
• Face outputs: _cut — exact intersection, clipped to the face rectangle. _projection — orthographic edges inside the box slab with hidden-line removal.
• Filled cut faces (for closed loops).
• Each run is versioned and organised in nested collections.

Planar Sections

• Create cutting planes in XY / XZ / YZ.
• Set Direction (+N/−N) and Depth to define the elevation slab.
• Live plane sizing (Size U/V) with anchors (Center / −U / +U / −V / +V).
• Stores a frozen plane copy per run.
• Elevation lines are occlusion-aware within the slab.

Export

• SVG: thin strokes (0.25) + filled polygons for closed cuts.
• DXF: LINE entities at Z=0 (pure 2D).
• Orientation comes from a saved Frame2D so exports are view-aligned.
• Flip X / Flip Y toggles to match your drawing convention.

Note: Internally, generated data may use SBX_ / SBP_ prefixes for compatibility. This does not affect usage.

Quick Start

Box Workflow

• Select the meshes to section → Create Box (fits selection).
• Adjust Width/Depth/Height with anchors; Move/Rotate live.
• Pick a face (±X / ±Y / ±Z) → Generate Box Section.
• Export → Export SVG (last Box run) or Export DXF (last Box run).
• If the 2D looks mirrored/flipped, toggle Flip X / Flip Y.

Planar Workflow

• Choose Plane (XY/XZ/YZ), Direction (+N/−N), and Depth.
• Create Plane → resize live (Size U/V + anchors).
• Bind selection (or rely on current selection) → Generate Planar Section.
• Export → Export SVG/DXF (last Plane run).

License: GPL-3.0