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Antlion / Components / Startline Capsule

Startline CapsuleSTARTLINE-003

Start line as a capsule - two equal semicircles joined by straight sides. The classic athletics track outline.

1Plan & setup
2Section
32D layout
43D solids
5Analysis

core Bowl ▸ Section 1 5 in · 5 out

Fig. 1 — PortsReads left, writes right
Startline Capsule component in Grasshopper
Field Info FieldObject · itemThe field, straight from Field
Source Outline SourceCurve · itemBuild the shape around this curve instead
Arc Shift ShiftNumber · itemHow far each semicircle center sits from the field center
Arc Radius RadiusNumber · itemRadius of the two end semicircles
Panel Values PanelObject · itemEvery value from Input Panel, as one bundle
Start Line StartObject · itemThe start line as one object
Start Line Curve CurveCurve · itemThe start line itself, a closed curve in plan
Arc Centers CentersPoint · listThe two semicircle center points, right then left
Arc Radii RadiiNumber · listRadius of each semicircle
Debug Text · itemDeveloper diagnostic output for tracking down bugs

Colored ports carry the chain from one component to the next. The rest are values you set once.

Inputs

  • Field InfoFieldThe field, straight from Field - gives the outline and its rotation
  • Source OutlineSourceBuild the shape around this curve instead. Used only when Field Info is not wired
  • Arc ShiftShiftHow far each semicircle center sits from the field center (default 42195 mm)
  • Arc RadiusRadiusRadius of the two end semicircles (default 48000 mm)
  • Panel ValuesPanelEvery value from Input Panel, as one bundle. Anything you wire in yourself wins over it

Outputs

  • Start LineStartThe start line as one object - curve plus its arc data. Wire into Axis
  • Start Line CurveCurveThe start line itself, a closed curve in plan
  • Arc CentersCentersThe two semicircle center points, right then left
  • Arc RadiiRadiiRadius of each semicircle
  • DebugDebugDeveloper diagnostic output for tracking down bugs. Copy this when reporting a problem
Component
STARTLINE-003
Ribbon
Bowl ▸ Section 1
Tier
core
Ports
5 in · 5 out
Version
1.0.11
Checked
2026-10-07