Schemas / Geometry / paint

`rig.geometry.spline`

v0.31.0 · draft 6 fields 3 required

Fields

Field	Type		Meaning
`degree`	int	required	Polynomial degree (typically 3)
`closed`	bool	optional	Optional. Absent = false
`controlPoints`	array<vec2>min 2 items	required	Control polygon (at least two points)
`knots`	array<number>	required	Knot vector (non-decreasing)
`weights`	array<number>	optional	Optional. Empty or absent = all weights 1 (non-rational). Same length as `controlPoints` when present
`fitPoints`	array<vec2>	optional	Optional. Authoring / DXF fit points; not required for evaluation when control points + knots are present

NURBS / control-point spline in the plane. Format when present. Space curves use rig.geometry.spline3d.

Tessellation to polylines or path commands is host fulfillment - this schema is the parametric source of truth. Do not also attach rig.geometry.path for the same contour.

Appearance: rig.paint.fill_stroke.

JSON Schema

Resolves at https://rig.works/schemas/rig.geometry.spline.schema.json — raw file.

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://rig.works/schemas/rig.geometry.spline.schema.json",
  "title": "rig.geometry.spline",
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "degree": {
      "$ref": "./_defs.schema.json#/$defs/int"
    },
    "closed": {
      "$ref": "./_defs.schema.json#/$defs/bool"
    },
    "controlPoints": {
      "type": "array",
      "items": {
        "$ref": "./_defs.schema.json#/$defs/vec2"
      },
      "minItems": 2
    },
    "knots": {
      "type": "array",
      "items": {
        "type": "number"
      }
    },
    "weights": {
      "type": "array",
      "items": {
        "type": "number"
      }
    },
    "fitPoints": {
      "type": "array",
      "items": {
        "$ref": "./_defs.schema.json#/$defs/vec2"
      }
    }
  },
  "required": [
    "degree",
    "controlPoints",
    "knots"
  ]
}