D3DXQuaternionExp

Calculates the exponential.

D3DXQuaternionExp( _ 
    QOut As D3DQUATERNION, _ 
    Q As D3DQUATERNION)

Parameters

QOut

D3DQUATERNION type that is the result of the operation, the exponential.

Q

The source D3DQUATERNION type.

Error Codes

If the function fails, an error is raised and Err.Number can be set to one of the following values.

For information on trapping errors, see the Microsoft® Visual Basic® Error Handling topic.

Remarks

This method converts a pure quaternion to a unit quaternion. D3DXQuaternionExp expects a pure quaternion, where w is ignored in the calculation (w == 0).

Given a pure quaternion defined by:
q = (0, theta * v); 

This method calculates the exponential result.
exp(Q) = (cos(theta), sin(theta) * v)

The return value for this function is the same value returned in the pOut parameter. In this way, the D3DXQuaternionExp function can be used as a parameter for another function.

The D3DXQuaternionSquadSetup method can also be used to set up the control points of a quaternion.

See Also

D3DXQuaternionLn, D3DXQuaternionSquad