Quaternion Constructor (Double, Double, Double, Double)
Initializes a new instance of the Quaternion structure.
Assembly: PresentationCore (in PresentationCore.dll)
For the axis (x, y, z) and angle of rotation theta, the w value for the quaternion is:
w = cos(theta/2)
Note that if you use the Vector3D constructor, the fourth parameter is the angle, in degrees, and the w calculation is performed for you.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.