API Reference > geometry-core > Serialization > IModelJson > IModelJson.BoxProps > topOrigin topOrigin topOrigin: undefined | XYZProps top origin. This is NOT required to be on the z axis. If omitted, a heigh must be present to given topOrigin on z axis. Defined in core/geometry/src/serialization/IModelJsonSchema.ts Line 386 Last Updated: 13 June, 2024