API Reference > core-geometry > Bspline > BSplineSurface3dH > create

create MethodStatic

Create a weighted bspline surface, with control points and weights each organized as flattened array of points continuing from one U row to the next.

  • This create variant takes control points in a "flattened" array, with points from succeeding U rows packed together in one array. Use createGrid if the points are in a deeper grid array structure.
  • knotArrayU and knotArrayV are optional -- uniform knots are implied if they are omitted (undefined).
  • When knots are given, two knot count conditions are recognized:
    • If poleArray.length + order == knotArray.length, the first and last are assumed to be the extraneous knots of classic clamping.
    • If poleArray.length + order == knotArray.length + 2, the knots are in modern form that does not have the classic unused first and last knot.

create(controlPointArray: Point3d[] | Float64Array, weightArray: number[] | Float64Array, numPolesU: number, orderU: number, knotArrayU: undefined | number[] | Float64Array, numPolesV: number, orderV: number, knotArrayV: undefined | number[] | Float64Array): undefined | BSplineSurface3dH

Parameter Type Description
controlPointArray Point3d[] | Float64Array Array of points, ordered along the U direction.
weightArray number[] | Float64Array array of weights, ordered along the U direction.
numPolesU number  
orderU number order for the U direction polynomial (order is one more than the degree. "cubic" polynomial is order 4.)
knotArrayU undefined | number[] | Float64Array  
numPolesV number  
orderV number order for the V direction polynomial (order is one more than the degree. "cubic" polynomial is order 4.)
knotArrayV undefined | number[] | Float64Array  

Returns - undefined | BSplineSurface3dH

Defined in

Last Updated: 20 June, 2023