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ConicalSurface.Create

Public Class

Creates a conical surface defined by a local reference frame and a half angle.

Namespace: Autodesk.Revit.DB

Assembly: RevitAPI (in RevitAPI.dll) Version: 25.0.0.0 (25.0.0.0)

Syntax

public static ConicalSurface Create(
  Frame frameOfReference,
  double halfAngle
)

Parameters

frameOfReference Frame

frameOfReference is an orthonormal frame that defines a local coordinate system for the cone.

  • Frame.Origin is a point on the cylinder’s axis.
  • Frame.BasisZ points along the axis, while Frame.BasisX and Frame.BasisY are orthogonal to the axis.
  • The frame may be either left-handed or right-handed (see Frame.IsRightHanded). Note that the “handedness” of the frame does not, by itself, determine the surface’s orientation.

halfAngleDouble

Cone angle. Must be not 0, lesser than PI/2 and greater than -PI/2.

Return Value

ConicalSurface
The created ConicalSurface.

Exceptions

Exception

Condition

ArgumentException

This Frame object may not be used as a local frame of reference. -or- The supplied value must be not 0, lesser than PI/2 and greater than -PI/2.

ArgumentNullException

A non-optional argument was null

Remarks

The parametric equation of the cone is S(u, v) = Frame.Origin + v*[sin(halfAngle)(cos(u)*Frame.BasisX + sin(u)*Frame.BasisY) + cos(halfAngle)*Frame.BasisZ] This implies the following facts:

  • Frame.BasisX points from the axis point to the point on the cylinder with coordinates (0, 0).
  • Frame.BasisY points in the direction of the partial derivative dS/du at (0, 0).
  • Frame.BasisZ points in the direction of the partial derivative dS/dv at (0, 0).

Only the branch of the cone with v >= 0 should be used.