| Microsoft DirectX 9.0 |
The SetVelocity method sets the listener's velocity.
Syntax
HRESULT SetVelocity(
D3DVALUE x,
D3DVALUE y,
D3DVALUE z,
DWORD dwApply
);
Parameters
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.
dwApply
Value that specifies when the setting should be applied. This value must be one of the following:
| Value | Description |
| 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. |
Return Values
If the method succeeds, the return value is DS_OK.
If the method fails, the return value may be DSERR_INVALIDPARAM.
Remarks
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.
Requirements
Header: Declared in dsound.h.
See Also