API Reference > geometry-core > Serialization > IModelJson > IModelJson.BSplineSurfaceProps IModelJson.BSplineSurfaceProps Interface Property rules for json objects that can be deserialized to a BsplineSurface See BCurveProps for discussion of knot and pole counts. Properties Name Type Description orderU number polynomial order (one more than degree) in the u parameter direction orderV number polynomial order (one more than degree) in the v parameter direction points [[[number]]] Square grid of control points (aka poles) in row major order (row is along the u direction) uKnots [number] Array of knots for the u direction bspline vKnots [number] Array of knots for the v direction bspline Defined in core/geometry/src/serialization/IModelJsonSchema.ts Line 102 Last Updated: 13 June, 2024