Determines if this CurveLoop is oriented counter-clockwise (CCW) or clockwise (CW) with respect to the specified 3D direction.

Namespace: Autodesk.Revit.DB
Assembly: RevitAPI (in RevitAPI.dll) Version: 24.0.0.0 (24.0.0.0)
Since: 2012

Syntax

C#
`public bool IsCounterclockwise( XYZ normal )`

Visual Basic
`Public Function IsCounterclockwise ( _ normal As XYZ _ ) As Boolean`

Visual C++
`public: bool IsCounterclockwise( XYZ^ normal )`

Parameters

normal: Type: Autodesk.Revit.DBXYZ
The normal vector to the plane used for this determination.

Return Value

True if the curve loop is oriented counter-clockwise with respect to the specified 3D direction, false if the loop is oriented clockwise.

Remarks

CCW means that the projection of the CurveLoop onto a plane having "normal" as its oriented normal is CCW. This method should only be called if the loop is closed and has a non-singular projection onto the plane (i.e., the projection should have no self-intersections and should not be degenerate or even nearly degenerate). The return value in other cases is indeterminate.

Exceptions

Exception	Condition
Autodesk.Revit.ExceptionsArgumentNullException	A non-optional argument was null
Autodesk.Revit.ExceptionsInvalidOperationException	The curve loop is open or consists of a single unbound curve; counterclockwise determination has no meaning.

IsCounterclockwise Method

Syntax

Parameters

Return Value

Remarks

Exceptions

See Also

Put AI to work inside Revit.