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Antlion / Components / Startline Oval

Startline OvalSTARTLINE-002

Start line as an oval around the field — four tangent arcs, or a true ellipse. Use when the bowl has no straight sides.

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

core Bowl ▸ Section 1 8 in · 5 out

Fig. 1 — PortsReads left, writes right
Startline Oval component in Grasshopper
Field Info FieldObject · itemThe field, straight from Field
Source Outline SourceCurve · itemBuild the oval around this curve instead
Oval Mode ▾ OvalText · itemFour tangent arcs with buildable radii, or a true ellipse
Add Long Number · itemHow far past the field the oval reaches along its long axis
Add Short Number · itemHow far past the field the oval reaches along its short axis
Snap Unit Snap UNumber · itemRounding step used by Radius Snap
Radius Snap SnapBoolean · itemRound the arc radii to whole units so they are easier to set out on site
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 four arc centers you set the oval out from
Arc Radii RadiiNumber · listRadius of each arc, matching Arc Centers
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 marked ▾ take a Value List: wire one in and it fills with the choices.

Inputs

  • Field InfoFieldThe field, straight from Field - gives the outline and its rotation
  • Source OutlineSourceBuild the oval around this curve instead. Used only when Field Info is not wired
  • Oval Mode▾ OvalFour tangent arcs with buildable radii, or a true ellipse (default ARC_4CENTER)
  • Add LongAdd LongHow far past the field the oval reaches along its long axis (default 25000 mm)
  • Add ShortAdd ShortHow far past the field the oval reaches along its short axis (default 25000 mm)
  • Snap UnitSnap URounding step used by Radius Snap (default 100 mm)
  • Radius SnapSnapRound the arc radii to whole units so they are easier to set out on site (default false)
  • 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 four arc centers you set the oval out from. Empty for TRUE_ELLIPSE - a true ellipse has no arcs to center
  • Arc RadiiRadiiRadius of each arc, matching Arc Centers. Empty for TRUE_ELLIPSE, the same as Arc Centers
  • DebugDebugDeveloper diagnostic output for tracking down bugs. Copy this when reporting a problem
Component
STARTLINE-002
Ribbon
Bowl ▸ Section 1
Tier
core
Ports
8 in · 5 out
Version
1.0.11
Checked
2026-10-07