|Microsoft DirectX 9.0|
The SetVelocity method sets the listener's velocity.
HRESULT SetVelocity( D3DVALUE x, D3DVALUE y, D3DVALUE z, DWORD dwApply );
x, y, and z
Values that specify the coordinates of the listener's velocity vector. DirectSound may adjust these values to prevent floating-point overflow. D3DVALUE is defined as float.
Value that specifies when the setting should be applied. This value must be one of the following:
|DS3D_DEFERRED||Settings are not applied until the application calls the IDirectSound3DListener8::CommitDeferredSettings method. This allows the application to change several settings and generate a single recalculation.|
|DS3D_IMMEDIATE||Settings are applied immediately, causing the system to recalculate the 3-D coordinates for all 3-D sound buffers.|
If the method succeeds, the return value is DS_OK.
If the method fails, the return value may be DSERR_INVALIDPARAM.
Velocity is used only for Doppler effects. It does not actually move the listener. To change the listener's position, use the IDirectSound3DListener8::SetPosition method. The default velocity is (0,0,0).
By default, measurement units are meters per second, but this can be changed by calling the IDirectSound3DListener8::SetDistanceFactor method.
Header: Declared in dsound.h.