Microsoft DirectX 8.0 (Visual Basic)

D3DXQuaternionIsIdentity

Determines if a quaternion is an identity quaternion.

D3DXQuaternionIsIdentity( _ 
    Q As D3DQUATERNION) As Long 

Parameters

Q
D3DQUATERNION type that will be tested for identity.

Return Values

If the quaternion is an identity quaternion, this function returns a non-zero value (TRUE); otherwise, this function returns zero (FALSE).

Error Codes

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

D3DERR_INVALIDCALL
D3DERR_OUTOFVIDEOMEMORY

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

See Also

D3DXQuaternionIdentity