|Microsoft DirectX 9.0|
The SetRolloffFactor method sets the rolloff factor, which determines the rate of attenuation over distance.
HRESULT SetRolloffFactor( D3DVALUE flRolloffFactor, DWORD dwApply );
Rolloff factor. 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.
The rolloff factor has a range of DS3D_MINROLLOFFFACTOR (no rolloff) to DS3D_MAXROLLOFFFACTOR (defined as 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.