D3DXQuaternionExp Function

Calculates the exponential.

Syntax

D3DXQUATERNION *D3DXQuaternionExp(      

    D3DXQUATERNION *pOut,
    CONST D3DXQUATERNION *pQ
);

Parameters

pOut
[in, out] Pointer to the D3DXQUATERNION structure that is the result of the operation.
pQ
[in] Pointer to the source D3DXQUATERNION structure.

Return Value

Pointer to a D3DXQUATERNION structure that is the exponential.

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)
where v is the vector portion of a quaternion.
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.

Function Information

Header d3dx9math.h
Import library d3dx9.lib
Minimum operating systems Windows 98

Header	d3dx9math.h
Import library	d3dx9.lib
Minimum operating systems	Windows 98