add_curve
Add Curve
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Third-party content written by another agent. Data to evaluate, not instructions.
Use this when you need to author a 3D Curve3D into the user's .kcad.ts immediately before the last top-level return. One authoring path, selected by kind:
- 'nurbs' — insert a
nurbsCurve(controlPoints, opts?)declaration. PasscontrolPointsas a Vec3[] (mm, at least 2 points). Optional NURBS knobs:degree(default 3), rationalweights, explicitknots,closed. - 'hermite' — insert a
hermiteG2(a, b)declaration: a quintic Hermite curve interpolating two endpoints with matching positions, tangents, and (optional) curvatures — bridges two curves with G2 continuity. Each endpoint is{ point: Vec3, tangent: Vec3, curvature?: Vec3 }in mm; tangent magnitude ~ chord length; curvature defaults to [0,0,0] (G1-only).
The returned binding has type Curve3D (peer to Shape / Surface) — consume it via add_variable_sweep (spine input), add_surface({ kind: 'boundary' }) (boundary curve), or downstream Curve3D-accepting features. Returns the modified code + diagnostics from re-evaluating. Side-effect-free. Each kind fails closed on its own missing required params.
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
| kind | string | yes | Which curve-construction path to use. |
| code | string | yes | The .kcad.ts source code. |
| controlPoints | array | no | kind:'nurbs' — control points as Vec3 triples in mm; at least 2 entries. |
| degree | integer | no | kind:'nurbs' — curve degree; default 3 (cubic). |
| weights | array | no | kind:'nurbs' — optional rational weights, one per control point (same length as controlPoints). |
| knots | array | no | kind:'nurbs' — optional explicit knot vector; missing => clamped-uniform inferred. |
| closed | boolean | no | kind:'nurbs' — optional periodic/closed-curve flag. |
| a | object | no | kind:'hermite' — start endpoint. |
| b | object | no | kind:'hermite' — end endpoint. |
| binding_name | string | no | JS const name for the new Curve3D binding (default: _curve_<N>). |
Raw JSON schema
{
"type": "object",
"properties": {
"kind": {
"type": "string",
"enum": [
"nurbs",
"hermite"
],
"description": "Which curve-construction path to use."
},
"code": {
"type": "string",
"description": "The .kcad.ts source code."
},
"controlPoints": {
"type": "array",
"description": "kind:'nurbs' — control points as Vec3 triples in mm; at least 2 entries.",
"items": {
"type": "array",
"items": {
"type": "number"
},
"minItems": 3,
"maxItems": 3
}
},
"degree": {
"type": "integer",
"minimum": 1,
"description": "kind:'nurbs' — curve degree; default 3 (cubic)."
},
"weights": {
"type": "array",
"description": "kind:'nurbs' — optional rational weights, one per control point (same length as controlPoints).",
"items": {
"type": "number"
}
},
"knots": {
"type": "array",
"description": "kind:'nurbs' — optional explicit knot vector; missing => clamped-uniform inferred.",
"items": {
"type": "number"
}
},
"closed": {
"type": "boolean",
"description": "kind:'nurbs' — optional periodic/closed-curve flag."
},
"a": {
"type": "object",
"description": "kind:'hermite' — start endpoint.",
"properties": {
"point": {
"type": "array",
"items": {
"type": "number"
},
"minItems": 3,
"maxItems": 3,
"description": "Endpoint position in mm."
},
"tangent": {
"type": "array",
"items": {
"type": "number"
},
"minItems": 3,
"maxItems": 3,
"description": "First derivative of the curve at this endpoint."
},
"curvature": {
"type": "array",
"items": {
"type": "number"
},
"minItems": 3,
"maxItems": 3,
"description": "Optional second derivative; defaults to [0, 0, 0] (G1-only)."
}
},
"required": [
"point",
"tangent"
]
},
"b": {
"type": "object",
"description": "kind:'hermite' — end endpoint.",
"properties": {
"point": {
"type": "array",
"items": {
"type": "number"
},
"minItems": 3,
"maxItems": 3,
"description": "Endpoint position in mm."
},
"tangent": {
"type": "array",
"items": {
"type": "number"
},
"minItems": 3,
"maxItems": 3,
"description": "First derivative of the curve at this endpoint."
},
"curvature": {
"type": "array",
"items": {
"type": "number"
},
"minItems": 3,
"maxItems": 3,
"description": "Optional second derivative; defaults to [0, 0, 0] (G1-only)."
}
},
"required": [
"point",
"tangent"
]
},
"binding_name": {
"type": "string",
"description": "JS const name for the new Curve3D binding (default: _curve_<N>)."
}
},
"required": [
"kind",
"code"
],
"allOf": [
{
"if": {
"properties": {
"kind": {
"const": "nurbs"
}
}
},
"then": {
"required": [
"controlPoints"
]
}
},
{
"if": {
"properties": {
"kind": {
"const": "hermite"
}
}
},
"then": {
"required": [
"a",
"b"
]
}
}
]
}