IDirectSound3DListener8::SetRolloffFactor
Sets the rolloff factor, which determines the rate of attenuation over distance.
HRESULT SetRolloffFactor(
D3DVALUE flRolloffFactor,
DWORD dwApply
);
Parameters
- flRolloffFactor
- Value that specifies the rolloff factor.
- dwApply
- 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.
Return Values
If the method succeeds, the return value is DS_OK.
If the method fails, the return value may be DSERR_INVALIDPARAM.
Remarks
The rolloff factor has a range of DS3D_MINROLLOFFFACTOR (no rolloff) to DS3D_MAXROLLOFFFACTOR (as currently defined, 10 times the rolloff found in the real world). The default value is DS3D_DEFAULTROLLOFFFACTOR (1.0). For more information, see Rolloff Factor.
Header: Declared in dsound.h.
See Also
IDirectSound3DListener8::GetRolloffFactor