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Enabling GI
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To enable the usage of GI for a given RED window:

.. code:: cpp

    // win is a pointer to a RED window.
    bool gi_enabled = true;

    RED::IOptions* iopt = win->As< RED::IOptions >();
    RC_TEST( iopt->SetOptionValue( RED::OPTIONS_RAY_GI, gi_enabled, iresmgr->GetState() ) ); 