WIP on HATO processing

src/Rendering/Binaural/FreeField/VABinauralFreeFieldAudioRenderer.cpp

@@ -55,6 +55,7 @@
 
 // Vista includes
 #include <VistaInterProcComm/Concurrency/VistaThreadEvent.h>
+#include <VistaBase/VistaQuaternion.h>
 
 // STL includes
 #include <algorithm>
@@ -736,9 +737,8 @@ void CVABinauralFreeFieldAudioRenderer::ProcessStream( const ITAStreamInfo* pStr
 		pPath->UpdateDir( bDIREnabled );
 
 		// HATO
-		const VAQuat qHATO = pListenerState->GetMotionState()->GetHeadAboveTorsoOrientation();
-		const double dHATODenominator = sqrt( 1 - qHATO.w * qHATO.w );
-		const double dHATODeg = rad2grad( dHATODenominator == 0.0f ? 0.0f : qHATO.y / dHATODenominator );
+		const VistaQuaternion qHATO( pListenerState->GetMotionState()->GetHeadAboveTorsoOrientation().comp );
+		const double dHATODeg = rad2grad( qHATO.GetAngles().b );
 		pPath->UpdateHRIR( pListenerState->GetAnthropometricData(), dHATODeg );
 
 		// Sound source gain / direct sound audibility via AuraMode flags

src/directivities/VADirectivityDAFFHATOHRIR.cpp

@@ -202,12 +202,12 @@ int CVADirectivityDAFFHATOHRIR::GetHATOChannelIndexLeft( const double dHATODeg )
 	else
 		iResult = ( int ) ( ( m_dHATOEndDeg + dNearestHATODeg ) / dHATORes ) + 1;
 
-	return 2 * iResult; // odd! index
+	return 2 * iResult; // even! channel index (starting at 0)
 }
 
 int CVADirectivityDAFFHATOHRIR::GetHATOChannelIndexRight( const double dHATODeg ) const
 {
-	return GetHATOChannelIndexLeft( dHATODeg ) + 1;
+	return GetHATOChannelIndexLeft(dHATODeg) + 1; // odd! channel index (indexing starts at 0, first right channels is 1)
 }
 
 void CVADirectivityDAFFHATOHRIR::GetHRIRByIndexAndHATO( ITASampleFrame* psfDest, const int iIndex, const double dHATODeg ) const