IDirectSound3DListener8::SetRolloffFactor

The SetRolloffFactor method sets the rolloff factor, which determines the rate of attenuation over distance.

HRESULT SetRolloffFactor(
  D3DVALUE flRolloffFactor,
  DWORD dwApply
);

Parameters

flRolloffFactor

Rolloff factor. 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 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 3D coordinates for all 3D 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 (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.

Requirements

Header: Declared in Dsound.h.

Import Library: Use Dsound3d.dll.

See Also

IDirectSound3DListener8