Antlion / Components / Custom Startline

Custom StartlineSTARTLINE-004

Start line taken from a curve you draw - aligned to the field frame for a preset field, used as drawn for a custom field. Use when no preset shape fits. An open curve gives a stand with two free ends.

1Plan & setup

2Section

32D layout

43D solids

5Analysis

core Bowl ▸ Section 1 2 in · 5 out

Fig. 1 — PortsReads left, writes right

Custom Startline component in Grasshopper

Field Info FieldObject · itemThe field, straight from Field

Custom Curve CurveCurve · itemYour start-line curve in plan

Start Line StartObject · itemThe start line as one object

Start Line Curve CurveCurve · itemYour curve

Arc Centers CentersPoint · listCenter point of every arc found in your curve

Arc Radii RadiiNumber · listRadius of each detected 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

Field InfoFieldThe field, straight from Field. Preset field: your curve is aligned to its frame. Custom field: used as drawn
Custom CurveCurveYour start-line curve in plan. Closed = a full ring, open = two free ends

Outputs

Start LineStartThe start line as one object - curve plus any arcs found in it. Wire into Axis
Start Line CurveCurveYour curve - aligned to the field frame (preset field) or exactly as drawn (custom field)
Arc CentersCentersCenter point of every arc found in your curve (empty when it has none)
Arc RadiiRadiiRadius of each detected arc, matching Arc Centers
DebugDebugDeveloper diagnostic output for tracking down bugs. Copy this when reporting a problem

Component: STARTLINE-004
Ribbon: Bowl ▸ Section 1
Tier: core
Ports: 2 in · 5 out
Version: 1.0.11
Checked: 2026-10-07