rig.spatial.vertex

Locator / point marker. Format when present - presence means this entity is a point in the scene graph, not a drawable and not a mesh corner.

No fields. Pose lives on rig.spatial.transform. Compose:

• rig.spatial.transform - the point (usual)
• rig.meta.named - label
• rig.spatial.relationship - children may parent here (null object)

A scene is a root vertex. An unparented vertex is the world origin; children set parent to it. A locator that is not a scene parents to that vertex (or to a rig.spatial.group under it). More than one unparented vertex that others parent to is more than one scene.

Do not put x / y / z on this schema. Do not invent rig.spatial.scene or a kind tag - the graph is the tag. Do not index into rig.geometry.mesh positions - mesh corners stay packed arrays. Do not invent rig.geometry.vertex or rig.geometry.point for a locator.

Not rig.spatial.anchor (which cell of bounds is the origin). Not rig.font.anchor (named glyph point; font cannot reuse transform).

A drawable dot is still a host present of this marker (or a tiny geometry primitive). The Contract names the role; it does not ship a point glyph.

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://rig.works/schemas/rig.spatial.vertex.schema.json",
  "title": "rig.spatial.vertex",
  "type": "object",
  "additionalProperties": false,
  "properties": {},
  "description": "Marker: presence means a locator / point. Pose on transform. An unparented vertex is a scene. No fields.",
  "minProperties": 0
}