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Label Collision QC

Finds overlapping labels as they actually plot: projecting every model-space annotation through each layout viewport's twist & scale into paper space, then flagging pairs whose plotted boxes overlap by more than a minimum area.

Command VDCLABELQC · VDC Sheets tab › Sheets + Takeoff panel
Finds overlapping labels as they actually plot: projecting every model-space annotation through each layout viewport's twist & scale into paper space, then flagging pairs whose plotted boxes overlap by more than a minimum area.
Model annotation × viewport twist & scale → paper-space boxes tested for overlap. MODEL SPACE (candidates) INV OUT 32.15 8" DIP @ 0.80% MText / DText / multileaders / label-layer entities twist + scale SHEET C-3, VIEWPORT (rotated 12°) INV OUT 32.15 8" DIP @ 0.80% OVERLAP 0.06 sq in > 0.02 min → FLAG Same pair may clear in another viewport, overlap is a property of the plotted picture, tested per viewport.
Model candidate / viewport frame   Twist + scale projection   Projected boxes & flagged overlap   Paper space

What it does

  • Gather once: collects MText, single-line text, multileaders, and any entity on the configured label layers from model space.
  • Project per viewport: pushes each candidate's model extents through the viewport's twist + scale into paper space via the shared ViewportIntrospector, keeping those inside the viewport.
  • Test overlap: compares the projected paper-space boxes within each layout+viewport; flags pairs overlapping by more than the threshold (paper units, typically sq in).
  • Per-viewport by design: a label's plotted size/orientation depends on scale + twist, so two labels clear in model space can collide on a rotated sheet, and vice-versa.
  • Read-only: one command audits the whole drawing; nothing is moved.

Settings & outputs

  • Minimum overlap: paper-space area (default 0.02 sq in) below which hairline touches are ignored.
  • Include types: MText, Text (DText), and multileader each toggle on/off (all on by default).
  • Label layers: extra layers always included regardless of type (edited in settings.json).
  • Settings: env var VDC_LABELQC_SETTINGS, default %APPDATA%\VDC\LabelQc\settings.json; schema-tolerant load; report cap (default 300).
  • Output: <drawing> - Label QC.csv plus the findings palette, double-click to zoom to the clash.
  • Scope: projection is plan-view (plan-readable reorientation not modeled); field-verify against rotated match-line sheets.

Dialog

Label Collision QC dialog
Label Collision QC, VDCLABELQC

When to use it

  • Catching label collisions on the plotted sheet before pen-up / final QC.

How to run it

  1. Run VDCLABELQC; set the minimum overlap area and which annotation types / label layers to include.
  2. Click OK; the tool projects each viewport's annotation into paper space and tests for overlaps.
  3. Review the overlapping-label findings in the palette; double-click to zoom to the pair.

Options

  • Minimum overlap: paper-space overlap area (default 0.02 sq in) below which collisions are ignored.
  • Include types: MText, Text (DText), and multileaders are each toggleable (all on by default).
  • Label layers: extra layers whose entities are always included, regardless of type (edited in settings.json).

Watch out for

  • Overlap is measured per viewport after projecting through its twist + scale - the same pair may collide in one viewport but not another.
  • Labels on different sheets / viewports are never compared, so there are no cross-sheet false positives.
  • The finding count is capped (default 300); reduce annotation or raise the minimum overlap if you hit the cap.

Related: Sheet Index · Standards QC · QC Status