Turning on adaptive sampling

To enable adaptive sampling, the application must:

  1. Change the sampler in use on the resource manager.
  2. Set some adaptation threshold (or set an amount of time to spend on calculating the image).
  3. Set some software anti-aliasing.
// Access the resource manager to set the sampler to the HM sampler:
RED::Object* resmgr = RED::Factory::CreateInstance( CID_REDResourceManager );
if( !resmgr )

RED::IResourceManager* iresmgr = resmgr->As< RED::IResourceManager >();
RED::IOptions* iresopt = resmgr->As< RED::IOptions >();

RC_TEST( iresopt->SetOptionValue( RED::OPTIONS_SAMPLER, 1, iresmgr->GetState() ) );

// Then, access to the scene viewpoint 'camera' and set the amount of adaptation to use:
RED::IOptions* icamopt = camera->As< RED::IOptions >();
RC_TEST( icamopt->SetOptionValue( RED::OPTIONS_RAY_ADAPTIVE_SAMPLING_THRESHOLD, 0.005, iresmgr->GetState() ) );

// Don't forget to have some anti-aliasing enabled on your 'vrl', otherwise, adaptation won't work:
RED::IViewpointRenderList* ivrl = vrl->As< RED::IViewpointRenderList >();
RC_TEST( ivrl->SetSoftAntiAlias( 4, iresmgr->GetState() ) );

Please refer to the page here for all details: Adaptive sampling.