Construct NurbsSurfaceData based on NURBS surface data, where the weights are supplied. The NURBS surface will be (piecewise) polynomial if all the weights are equal, rational if not. Note: A rational polynomial is a quotient of two polynomials; this includes a polynomial, which can be thought of as a quotient with denominator equal to 1.
Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 17.0.0.0 (17.0.1090.0)
Since: 2016
Syntax
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Parameters
- degreeU
- Type: System Int32
The degree of the spline in the u-direction; must be positive.
- degreeV
- Type: System Int32
The degree of the spline in the v-direction; must be positive.
- knotsU
- Type: System.Collections.Generic IList Double
Knot values in the u-direction. The number of knots in the u-direction must be at least 2 * (degreeU + 1).
- knotsV
- Type: System.Collections.Generic IList Double
Knot values in the v-direction. The number of knots in the v-direction must be at least 2 * (degreeV + 1).
- controlPoints
- Type: System.Collections.Generic IList XYZ
One dimensional array of points representing the two dimensional net of control points of the NURBS surface in u and v directions.The total number of control points must equal numControlPtsU times numControlPtsV, where numControlPtsU and numControlPtsV are the numbers of control points in u and v directions, and they must satisfy the following conditions:
- numControlPtsU = number of knots in u - degreeU - 1.
- numControlPtsV = number of knots in v - degreeV - 1.
- weights
- Type: System.Collections.Generic IList Double
Array of weights assigned to the control points. The number of weights must equal the number of control points. All weights should be greater than zero.
- bReverseOrientation
- Type: System Boolean
If true, the surface's orientation is opposite to the canonical parametric orientation, otherwise it is the same. The canonical parametric orientation is a counter-clockwise sense of rotation in the uv-parameter plane. Extrinsically, the oriented normal vector for the canonical parametric orientation points in the direction of the cross product dS/du x dS/dv, which S(u, v) is the parameterized surface.
Exceptions
Exception | Condition |
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Autodesk.Revit.Exceptions ArgumentException | The U-degree value must be at least 1. -or- The V-degree value must be at least 1. -or- The number of knots in the U direction must be at least 2 times the U-degree plus 1. -or- The number of knots in the V direction must be at least 2 times the V-degree plus 1. -or- The number of control points must equal (number of U-knots - U-degree - 1) * (number of V-knots - V-degree - 1). -or- The number of weights must be the same as the number of control points and all weights must be positive or all zero. |
Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |