Refactor CUDA projector params into struct

16 files changed, 185 insertions, 189 deletions

diff --git a/cuda/3d/algo3d.cu b/cuda/3d/algo3d.cu
index cc86b70..e2c1e43 100644
--- a/cuda/3d/algo3d.cu
+++ b/cuda/3d/algo3d.cu
@@ -41,7 +41,6 @@ ReconAlgo3D::ReconAlgo3D()
 	coneProjs = 0;
 	par3DProjs = 0;
 	shouldAbort = false;
-	fOutputScale = 1.0f;
 }
 
 ReconAlgo3D::~ReconAlgo3D()
@@ -58,10 +57,10 @@ void ReconAlgo3D::reset()
 	shouldAbort = false;
 }
 
-bool ReconAlgo3D::setConeGeometry(const SDimensions3D& _dims, const SConeProjection* _angles, float _outputScale)
+bool ReconAlgo3D::setConeGeometry(const SDimensions3D& _dims, const SConeProjection* _angles, const SProjectorParams3D& _params)
 {
 	dims = _dims;
-	fOutputScale = _outputScale;
+	params = _params;
 
 	coneProjs = new SConeProjection[dims.iProjAngles];
 	par3DProjs = 0;
@@ -71,10 +70,10 @@ bool ReconAlgo3D::setConeGeometry(const SDimensions3D& _dims, const SConeProject
 	return true;
 }
 
-bool ReconAlgo3D::setPar3DGeometry(const SDimensions3D& _dims, const SPar3DProjection* _angles, float _outputScale)
+bool ReconAlgo3D::setPar3DGeometry(const SDimensions3D& _dims, const SPar3DProjection* _angles, const SProjectorParams3D& _params)
 {
 	dims = _dims;
-	fOutputScale = _outputScale;
+	params = _params;
 
 	par3DProjs = new SPar3DProjection[dims.iProjAngles];
 	coneProjs = 0;
@@ -89,10 +88,12 @@ bool ReconAlgo3D::callFP(cudaPitchedPtr& D_volumeData,
                        cudaPitchedPtr& D_projData,
                        float outputScale)
 {
+	SProjectorParams3D p = params;
+	p.fOutputScale *= outputScale;
 	if (coneProjs) {
-		return ConeFP(D_volumeData, D_projData, dims, coneProjs, outputScale * this->fOutputScale);
+		return ConeFP(D_volumeData, D_projData, dims, coneProjs, p);
 	} else {
-		return Par3DFP(D_volumeData, D_projData, dims, par3DProjs, outputScale * this->fOutputScale);
+		return Par3DFP(D_volumeData, D_projData, dims, par3DProjs, p);
 	}
 }
 
@@ -100,10 +101,12 @@ bool ReconAlgo3D::callBP(cudaPitchedPtr& D_volumeData,
                        cudaPitchedPtr& D_projData,
                        float outputScale)
 {
+	SProjectorParams3D p = params;
+	p.fOutputScale *= outputScale;
 	if (coneProjs) {
-		return ConeBP(D_volumeData, D_projData, dims, coneProjs, outputScale * this->fOutputScale);
+		return ConeBP(D_volumeData, D_projData, dims, coneProjs, p);
 	} else {
-		return Par3DBP(D_volumeData, D_projData, dims, par3DProjs, outputScale * this->fOutputScale);
+		return Par3DBP(D_volumeData, D_projData, dims, par3DProjs, p);
 	}
 }
 
diff --git a/cuda/3d/algo3d.h b/cuda/3d/algo3d.h
index 886b092..ce331ad 100644
--- a/cuda/3d/algo3d.h
+++ b/cuda/3d/algo3d.h
@@ -39,8 +39,8 @@ public:
 	ReconAlgo3D();
 	~ReconAlgo3D();
 
-	bool setConeGeometry(const SDimensions3D& dims, const SConeProjection* projs, float fOutputScale);
-	bool setPar3DGeometry(const SDimensions3D& dims, const SPar3DProjection* projs, float fOutputScale);
+	bool setConeGeometry(const SDimensions3D& dims, const SConeProjection* projs, const SProjectorParams3D& params);
+	bool setPar3DGeometry(const SDimensions3D& dims, const SPar3DProjection* projs, const SProjectorParams3D& params);
 
 	void signalAbort() { shouldAbort = true; }
 
@@ -55,6 +55,7 @@ protected:
 	            float outputScale);
 
 	SDimensions3D dims;
+	SProjectorParams3D params;
 	SConeProjection* coneProjs;
 	SPar3DProjection* par3DProjs;
 
diff --git a/cuda/3d/astra3d.cu b/cuda/3d/astra3d.cu
index 8328229..454530e 100644
--- a/cuda/3d/astra3d.cu
+++ b/cuda/3d/astra3d.cu
@@ -67,7 +67,7 @@ template<typename ProjectionT>
 static bool convertAstraGeometry_internal(const CVolumeGeometry3D* pVolGeom,
                           unsigned int iProjectionAngleCount,
                           ProjectionT*& pProjs,
-                          float& fOutputScale)
+                          SProjectorParams3D& params)
 {
 	assert(pVolGeom);
 	assert(pProjs);
@@ -94,7 +94,7 @@ static bool convertAstraGeometry_internal(const CVolumeGeometry3D* pVolGeom,
 	}
 
 	// CHECKME: Check factor
-	fOutputScale *= pVolGeom->getPixelLengthX();
+	params.fOutputScale *= pVolGeom->getPixelLengthX();
 
 	return true;
 }
@@ -108,10 +108,8 @@ bool convertAstraGeometry_dims(const CVolumeGeometry3D* pVolGeom,
 	dims.iVolY = pVolGeom->getGridRowCount();
 	dims.iVolZ = pVolGeom->getGridSliceCount();
 	dims.iProjAngles = pProjGeom->getProjectionCount();
-	dims.iProjU = pProjGeom->getDetectorColCount(),
-	dims.iProjV = pProjGeom->getDetectorRowCount(),
-	dims.iRaysPerDetDim = 1;
-	dims.iRaysPerVoxelDim = 1;
+	dims.iProjU = pProjGeom->getDetectorColCount();
+	dims.iProjV = pProjGeom->getDetectorRowCount();
 
 	if (dims.iVolX <= 0 || dims.iVolX <= 0 || dims.iVolX <= 0)
 		return false;
@@ -124,7 +122,7 @@ bool convertAstraGeometry_dims(const CVolumeGeometry3D* pVolGeom,
 
 bool convertAstraGeometry(const CVolumeGeometry3D* pVolGeom,
                           const CParallelProjectionGeometry3D* pProjGeom,
-                          SPar3DProjection*& pProjs, float& fOutputScale)
+                          SPar3DProjection*& pProjs, SProjectorParams3D& params)
 {
 	assert(pVolGeom);
 	assert(pProjGeom);
@@ -141,16 +139,14 @@ bool convertAstraGeometry(const CVolumeGeometry3D* pVolGeom,
 
 	bool ok;
 
-	fOutputScale = 1.0f;
-
-	ok = convertAstraGeometry_internal(pVolGeom, nth, pProjs, fOutputScale);
+	ok = convertAstraGeometry_internal(pVolGeom, nth, pProjs, params);
 
 	return ok;
 }
 
 bool convertAstraGeometry(const CVolumeGeometry3D* pVolGeom,
                           const CParallelVecProjectionGeometry3D* pProjGeom,
-                          SPar3DProjection*& pProjs, float& fOutputScale)
+                          SPar3DProjection*& pProjs, SProjectorParams3D& params)
 {
 	assert(pVolGeom);
 	assert(pProjGeom);
@@ -164,16 +160,14 @@ bool convertAstraGeometry(const CVolumeGeometry3D* pVolGeom,
 
 	bool ok;
 
-	fOutputScale = 1.0f;
-
-	ok = convertAstraGeometry_internal(pVolGeom, nth, pProjs, fOutputScale);
+	ok = convertAstraGeometry_internal(pVolGeom, nth, pProjs, params);
 
 	return ok;
 }
 
 bool convertAstraGeometry(const CVolumeGeometry3D* pVolGeom,
                           const CConeProjectionGeometry3D* pProjGeom,
-                          SConeProjection*& pProjs, float& fOutputScale)
+                          SConeProjection*& pProjs, SProjectorParams3D& params)
 {
 	assert(pVolGeom);
 	assert(pProjGeom);
@@ -192,16 +186,14 @@ bool convertAstraGeometry(const CVolumeGeometry3D* pVolGeom,
 
 	bool ok;
 
-	fOutputScale = 1.0f;
-
-	ok = convertAstraGeometry_internal(pVolGeom, nth, pProjs, fOutputScale);
+	ok = convertAstraGeometry_internal(pVolGeom, nth, pProjs, params);
 
 	return ok;
 }
 
 bool convertAstraGeometry(const CVolumeGeometry3D* pVolGeom,
                           const CConeVecProjectionGeometry3D* pProjGeom,
-                          SConeProjection*& pProjs, float& fOutputScale)
+                          SConeProjection*& pProjs, SProjectorParams3D& params)
 {
 	assert(pVolGeom);
 	assert(pProjGeom);
@@ -215,9 +207,7 @@ bool convertAstraGeometry(const CVolumeGeometry3D* pVolGeom,
 
 	bool ok;
 
-	fOutputScale = 1.0f;
-
-	ok = convertAstraGeometry_internal(pVolGeom, nth, pProjs, fOutputScale);
+	ok = convertAstraGeometry_internal(pVolGeom, nth, pProjs, params);
 
 	return ok;
 }
@@ -227,7 +217,7 @@ bool convertAstraGeometry(const CVolumeGeometry3D* pVolGeom,
                           const CProjectionGeometry3D* pProjGeom,
                           SPar3DProjection*& pParProjs,
                           SConeProjection*& pConeProjs,
-                          float& fOutputScale)
+                          SProjectorParams3D& params)
 {
 	const CConeProjectionGeometry3D* conegeom = dynamic_cast<const CConeProjectionGeometry3D*>(pProjGeom);
 	const CParallelProjectionGeometry3D* par3dgeom = dynamic_cast<const CParallelProjectionGeometry3D*>(pProjGeom);
@@ -240,13 +230,13 @@ bool convertAstraGeometry(const CVolumeGeometry3D* pVolGeom,
 	bool ok;
 
 	if (conegeom) {
-		ok = convertAstraGeometry(pVolGeom, conegeom, pConeProjs, fOutputScale);
+		ok = convertAstraGeometry(pVolGeom, conegeom, pConeProjs, params);
 	} else if (conevec3dgeom) {
-		ok = convertAstraGeometry(pVolGeom, conevec3dgeom, pConeProjs, fOutputScale);
+		ok = convertAstraGeometry(pVolGeom, conevec3dgeom, pConeProjs, params);
 	} else if (par3dgeom) {
-		ok = convertAstraGeometry(pVolGeom, par3dgeom, pParProjs, fOutputScale);
+		ok = convertAstraGeometry(pVolGeom, par3dgeom, pParProjs, params);
 	} else if (parvec3dgeom) {
-		ok = convertAstraGeometry(pVolGeom, parvec3dgeom, pParProjs, fOutputScale);
+		ok = convertAstraGeometry(pVolGeom, parvec3dgeom, pParProjs, params);
 	} else {
 		ok = false;
 	}
@@ -260,19 +250,16 @@ bool convertAstraGeometry(const CVolumeGeometry3D* pVolGeom,
 class AstraSIRT3d_internal {
 public:
 	SDimensions3D dims;
+	SProjectorParams3D params;
 	CUDAProjectionType3d projType;
 
 	float* angles;
 	float fOriginSourceDistance;
 	float fOriginDetectorDistance;
-	float fSourceZ;
-	float fDetSize;
 
 	SConeProjection* projs;
 	SPar3DProjection* parprojs;
 
-	float fOutputScale;
-
 	bool initialized;
 	bool setStartReconstruction;
 
@@ -304,12 +291,9 @@ AstraSIRT3d::AstraSIRT3d()
 	pData->dims.iProjAngles = 0;
 	pData->dims.iProjU = 0;
 	pData->dims.iProjV = 0;
-	pData->dims.iRaysPerDetDim = 1;
-	pData->dims.iRaysPerVoxelDim = 1;
 
 	pData->projs = 0;
 	pData->parprojs = 0;
-	pData->fOutputScale = 1.0f;
 
 	pData->initialized = false;
 	pData->setStartReconstruction = false;
@@ -358,7 +342,7 @@ bool AstraSIRT3d::setGeometry(const CVolumeGeometry3D* pVolGeom,
 
 	ok = convertAstraGeometry(pVolGeom, pProjGeom,
 	                          pData->parprojs, pData->projs,
-	                          pData->fOutputScale);
+	                          pData->params);
 	if (!ok)
 		return false;
 
@@ -383,8 +367,8 @@ bool AstraSIRT3d::enableSuperSampling(unsigned int iVoxelSuperSampling,
 	if (iVoxelSuperSampling == 0 || iDetectorSuperSampling == 0)
 		return false;
 
-	pData->dims.iRaysPerVoxelDim = iVoxelSuperSampling;
-	pData->dims.iRaysPerDetDim = iDetectorSuperSampling;
+	pData->params.iRaysPerVoxelDim = iVoxelSuperSampling;
+	pData->params.iRaysPerDetDim = iDetectorSuperSampling;
 
 	return true;
 }
@@ -436,9 +420,9 @@ bool AstraSIRT3d::init()
 	bool ok;
 
 	if (pData->projType == PROJ_PARALLEL) {
-		ok = pData->sirt.setPar3DGeometry(pData->dims, pData->parprojs, pData->fOutputScale);
+		ok = pData->sirt.setPar3DGeometry(pData->dims, pData->parprojs, pData->params);
 	} else {
-		ok = pData->sirt.setConeGeometry(pData->dims, pData->projs, pData->fOutputScale);
+		ok = pData->sirt.setConeGeometry(pData->dims, pData->projs, pData->params);
 	}
 
 	if (!ok)
@@ -639,19 +623,16 @@ float AstraSIRT3d::computeDiffNorm()
 class AstraCGLS3d_internal {
 public:
 	SDimensions3D dims;
+	SProjectorParams3D params;
 	CUDAProjectionType3d projType;
 
 	float* angles;
 	float fOriginSourceDistance;
 	float fOriginDetectorDistance;
-	float fSourceZ;
-	float fDetSize;
 
 	SConeProjection* projs;
 	SPar3DProjection* parprojs;
 
-	float fOutputScale;
-
 	bool initialized;
 	bool setStartReconstruction;
 
@@ -683,12 +664,9 @@ AstraCGLS3d::AstraCGLS3d()
 	pData->dims.iProjAngles = 0;
 	pData->dims.iProjU = 0;
 	pData->dims.iProjV = 0;
-	pData->dims.iRaysPerDetDim = 1;
-	pData->dims.iRaysPerVoxelDim = 1;
 
 	pData->projs = 0;
 	pData->parprojs = 0;
-	pData->fOutputScale = 1.0f;
 
 	pData->initialized = false;
 	pData->setStartReconstruction = false;
@@ -737,7 +715,7 @@ bool AstraCGLS3d::setGeometry(const CVolumeGeometry3D* pVolGeom,
 
 	ok = convertAstraGeometry(pVolGeom, pProjGeom,
 	                          pData->parprojs, pData->projs,
-	                          pData->fOutputScale);
+	                          pData->params);
 	if (!ok)
 		return false;
 
@@ -761,8 +739,8 @@ bool AstraCGLS3d::enableSuperSampling(unsigned int iVoxelSuperSampling,
 	if (iVoxelSuperSampling == 0 || iDetectorSuperSampling == 0)
 		return false;
 
-	pData->dims.iRaysPerVoxelDim = iVoxelSuperSampling;
-	pData->dims.iRaysPerDetDim = iDetectorSuperSampling;
+	pData->params.iRaysPerVoxelDim = iVoxelSuperSampling;
+	pData->params.iRaysPerDetDim = iDetectorSuperSampling;
 
 	return true;
 }
@@ -816,9 +794,9 @@ bool AstraCGLS3d::init()
 	bool ok;
 
 	if (pData->projType == PROJ_PARALLEL) {
-		ok = pData->cgls.setPar3DGeometry(pData->dims, pData->parprojs, pData->fOutputScale);
+		ok = pData->cgls.setPar3DGeometry(pData->dims, pData->parprojs, pData->params);
 	} else {
-		ok = pData->cgls.setConeGeometry(pData->dims, pData->projs, pData->fOutputScale);
+		ok = pData->cgls.setConeGeometry(pData->dims, pData->projs, pData->params);
 	}
 
 	if (!ok)
@@ -1026,23 +1004,23 @@ bool astraCudaFP(const float* pfVolume, float* pfProjections,
                  Cuda3DProjectionKernel projKernel)
 {
 	SDimensions3D dims;
+	SProjectorParams3D params;
+
+	params.iRaysPerDetDim = iDetectorSuperSampling;
 
 	bool ok = convertAstraGeometry_dims(pVolGeom, pProjGeom, dims);
 	if (!ok)
 		return false;
 
-	dims.iRaysPerDetDim = iDetectorSuperSampling;
 	if (iDetectorSuperSampling == 0)
 		return false;
 
 	SPar3DProjection* pParProjs;
 	SConeProjection* pConeProjs;
 
-	float outputScale;
-
 	ok = convertAstraGeometry(pVolGeom, pProjGeom,
 	                          pParProjs, pConeProjs,
-	                          outputScale);
+	                          params);
 
 
 	if (iGPUIndex != -1) {
@@ -1080,10 +1058,10 @@ bool astraCudaFP(const float* pfVolume, float* pfProjections,
 	if (pParProjs) {
 		switch (projKernel) {
 		case ker3d_default:
-			ok &= Par3DFP(D_volumeData, D_projData, dims, pParProjs, outputScale);
+			ok &= Par3DFP(D_volumeData, D_projData, dims, pParProjs, params);
 			break;
 		case ker3d_sum_square_weights:
-			ok &= Par3DFP_SumSqW(D_volumeData, D_projData, dims, pParProjs, outputScale*outputScale);
+			ok &= Par3DFP_SumSqW(D_volumeData, D_projData, dims, pParProjs, params);
 			break;
 		default:
 			assert(false);
@@ -1091,7 +1069,7 @@ bool astraCudaFP(const float* pfVolume, float* pfProjections,
 	} else {
 		switch (projKernel) {
 		case ker3d_default:
-			ok &= ConeFP(D_volumeData, D_projData, dims, pConeProjs, outputScale);
+			ok &= ConeFP(D_volumeData, D_projData, dims, pConeProjs, params);
 			break;
 		default:
 			assert(false);
@@ -1116,21 +1094,20 @@ bool astraCudaBP(float* pfVolume, const float* pfProjections,
                  int iGPUIndex, int iVoxelSuperSampling)
 {
 	SDimensions3D dims;
+	SProjectorParams3D params;
+
+	params.iRaysPerVoxelDim = iVoxelSuperSampling;
 
 	bool ok = convertAstraGeometry_dims(pVolGeom, pProjGeom, dims);
 	if (!ok)
 		return false;
 
-	dims.iRaysPerVoxelDim = iVoxelSuperSampling;
-
 	SPar3DProjection* pParProjs;
 	SConeProjection* pConeProjs;
 
-	float outputScale;
-
 	ok = convertAstraGeometry(pVolGeom, pProjGeom,
 	                          pParProjs, pConeProjs,
-	                          outputScale);
+	                          params);
 
 	if (iGPUIndex != -1) {
 		cudaSetDevice(iGPUIndex);
@@ -1166,9 +1143,9 @@ bool astraCudaBP(float* pfVolume, const float* pfProjections,
 	}
 
 	if (pParProjs)
-		ok &= Par3DBP(D_volumeData, D_projData, dims, pParProjs, outputScale);
+		ok &= Par3DBP(D_volumeData, D_projData, dims, pParProjs, params);
 	else
-		ok &= ConeBP(D_volumeData, D_projData, dims, pConeProjs, outputScale);
+		ok &= ConeBP(D_volumeData, D_projData, dims, pConeProjs, params);
 
 	ok &= copyVolumeFromDevice(pfVolume, D_volumeData, dims, dims.iVolX);
 
@@ -1191,21 +1168,21 @@ bool astraCudaBP_SIRTWeighted(float* pfVolume,
                       int iGPUIndex, int iVoxelSuperSampling)
 {
 	SDimensions3D dims;
+	SProjectorParams3D params;
+
+	params.iRaysPerVoxelDim = iVoxelSuperSampling;
 
 	bool ok = convertAstraGeometry_dims(pVolGeom, pProjGeom, dims);
 	if (!ok)
 		return false;
 
-	dims.iRaysPerVoxelDim = iVoxelSuperSampling;
 
 	SPar3DProjection* pParProjs;
 	SConeProjection* pConeProjs;
 
-	float outputScale;
-
 	ok = convertAstraGeometry(pVolGeom, pProjGeom,
 	                          pParProjs, pConeProjs,
-	                          outputScale);
+	                          params);
 
 	if (iGPUIndex != -1) {
 		cudaSetDevice(iGPUIndex);
@@ -1242,9 +1219,9 @@ bool astraCudaBP_SIRTWeighted(float* pfVolume,
 	processSino3D<opSet>(D_projData, 1.0f, dims);
 
 	if (pParProjs)
-		ok &= Par3DBP(D_pixelWeight, D_projData, dims, pParProjs, outputScale);
+		ok &= Par3DBP(D_pixelWeight, D_projData, dims, pParProjs, params);
 	else
-		ok &= ConeBP(D_pixelWeight, D_projData, dims, pConeProjs, outputScale);
+		ok &= ConeBP(D_pixelWeight, D_projData, dims, pConeProjs, params);
 
 	processVol3D<opInvert>(D_pixelWeight, dims);
 	if (!ok) {
@@ -1259,9 +1236,9 @@ bool astraCudaBP_SIRTWeighted(float* pfVolume,
 	ok &= zeroVolumeData(D_volumeData, dims);
 	// Do BP into D_volumeData
 	if (pParProjs)
-		ok &= Par3DBP(D_volumeData, D_projData, dims, pParProjs, outputScale);
+		ok &= Par3DBP(D_volumeData, D_projData, dims, pParProjs, params);
 	else
-		ok &= ConeBP(D_volumeData, D_projData, dims, pConeProjs, outputScale);
+		ok &= ConeBP(D_volumeData, D_projData, dims, pConeProjs, params);
 
 	// Multiply with weights
 	processVol3D<opMul>(D_volumeData, D_pixelWeight, dims);
@@ -1301,6 +1278,9 @@ bool astraCudaFDK(float* pfVolume, const float* pfProjections,
                   int iGPUIndex, int iVoxelSuperSampling)
 {
 	SDimensions3D dims;
+	SProjectorParams3D params;
+
+	params.iRaysPerVoxelDim = iVoxelSuperSampling;
 
 	bool ok = convertAstraGeometry_dims(pVolGeom, pProjGeom, dims);
 
@@ -1310,7 +1290,6 @@ bool astraCudaFDK(float* pfVolume, const float* pfProjections,
 	if (!ok)
 		return false;
 
-	dims.iRaysPerVoxelDim = iVoxelSuperSampling;
 
 	if (iVoxelSuperSampling == 0)
 		return false;
@@ -1354,6 +1333,7 @@ bool astraCudaFDK(float* pfVolume, const float* pfProjections,
 
 
 	// TODO: Offer interface for SrcZ, DetZ
+	// TODO: Voxel scaling
 	ok &= FDK(D_volumeData, D_projData, fOriginSourceDistance,
 	          fOriginDetectorDistance, 0, 0, fDetUSize, fDetVSize,
 	          dims, pfAngles, bShortScan);
diff --git a/cuda/3d/astra3d.h b/cuda/3d/astra3d.h
index 2782994..1f1cee2 100644
--- a/cuda/3d/astra3d.h
+++ b/cuda/3d/astra3d.h
@@ -37,11 +37,6 @@ namespace astra {
 // TODO: Switch to a class hierarchy as with the 2D algorithms
 
 
-enum Cuda3DProjectionKernel {
-	ker3d_default = 0,
-	ker3d_sum_square_weights
-};
-
 class CProjectionGeometry3D;
 class CParallelProjectionGeometry3D;
 class CParallelVecProjectionGeometry3D;
@@ -50,6 +45,10 @@ class CConeVecProjectionGeometry3D;
 class CVolumeGeometry3D;
 class AstraSIRT3d_internal;
 
+using astraCUDA3d::Cuda3DProjectionKernel;
+using astraCUDA3d::ker3d_default;
+using astraCUDA3d::ker3d_sum_square_weights;
+
 
 class _AstraExport AstraSIRT3d {
 public:
@@ -289,7 +288,7 @@ bool convertAstraGeometry(const CVolumeGeometry3D* pVolGeom,
                           const CProjectionGeometry3D* pProjGeom,
                           SPar3DProjection*& pParProjs,
                           SConeProjection*& pConeProjs,
-                          float& fOutputScale);
+                          astraCUDA3d::SProjectorParams3D& params);
 
 _AstraExport bool astraCudaFP(const float* pfVolume, float* pfProjections,
                       const CVolumeGeometry3D* pVolGeom,
diff --git a/cuda/3d/cgls3d.cu b/cuda/3d/cgls3d.cu
index dd0e8a0..0b0331e 100644
--- a/cuda/3d/cgls3d.cu
+++ b/cuda/3d/cgls3d.cu
@@ -242,7 +242,7 @@ bool doCGLS(cudaPitchedPtr& D_volumeData,
 	CGLS cgls;
 	bool ok = true;
 
-	ok &= cgls.setConeGeometry(dims, angles, 1.0f);
+	ok &= cgls.setConeGeometry(dims, angles, SProjectorParams3D());
 	if (D_maskData.ptr)
 		ok &= cgls.enableVolumeMask();
 
diff --git a/cuda/3d/cone_bp.cu b/cuda/3d/cone_bp.cu
index 4a41f6a..8c35125 100644
--- a/cuda/3d/cone_bp.cu
+++ b/cuda/3d/cone_bp.cu
@@ -154,7 +154,7 @@ __global__ void dev_cone_BP(void* D_volData, unsigned int volPitch, int startAng
 
 
 // supersampling version
-__global__ void dev_cone_BP_SS(void* D_volData, unsigned int volPitch, int startAngle, int angleOffset, const SDimensions3D dims, float fOutputScale)
+__global__ void dev_cone_BP_SS(void* D_volData, unsigned int volPitch, int startAngle, int angleOffset, const SDimensions3D dims, int iRaysPerVoxelDim, float fOutputScale)
 {
 	float* volData = (float*)D_volData;
 
@@ -185,12 +185,12 @@ __global__ void dev_cone_BP_SS(void* D_volData, unsigned int volPitch, int start
 	if (endZ > dims.iVolZ)
 		endZ = dims.iVolZ;
 
-	float fX = X - 0.5f*dims.iVolX + 0.5f - 0.5f + 0.5f/dims.iRaysPerVoxelDim;
-	float fY = Y - 0.5f*dims.iVolY + 0.5f - 0.5f + 0.5f/dims.iRaysPerVoxelDim;
-	float fZ = startZ - 0.5f*dims.iVolZ + 0.5f - 0.5f + 0.5f/dims.iRaysPerVoxelDim;
-	const float fSubStep = 1.0f/dims.iRaysPerVoxelDim;
+	float fX = X - 0.5f*dims.iVolX + 0.5f - 0.5f + 0.5f/iRaysPerVoxelDim;
+	float fY = Y - 0.5f*dims.iVolY + 0.5f - 0.5f + 0.5f/iRaysPerVoxelDim;
+	float fZ = startZ - 0.5f*dims.iVolZ + 0.5f - 0.5f + 0.5f/iRaysPerVoxelDim;
+	const float fSubStep = 1.0f/iRaysPerVoxelDim;
 
-	fOutputScale /= (dims.iRaysPerVoxelDim*dims.iRaysPerVoxelDim*dims.iRaysPerVoxelDim);
+	fOutputScale /= (iRaysPerVoxelDim*iRaysPerVoxelDim*iRaysPerVoxelDim);
 
 
 	for (int Z = startZ; Z < endZ; ++Z, fZ += 1.0f)
@@ -216,11 +216,11 @@ __global__ void dev_cone_BP_SS(void* D_volData, unsigned int volPitch, int start
 			const float fCdc = gC_C[12*angle+11];
 
 			float fXs = fX;
-			for (int iSubX = 0; iSubX < dims.iRaysPerVoxelDim; ++iSubX) {
+			for (int iSubX = 0; iSubX < iRaysPerVoxelDim; ++iSubX) {
 			float fYs = fY;
-			for (int iSubY = 0; iSubY < dims.iRaysPerVoxelDim; ++iSubY) {
+			for (int iSubY = 0; iSubY < iRaysPerVoxelDim; ++iSubY) {
 			float fZs = fZ;
-			for (int iSubZ = 0; iSubZ < dims.iRaysPerVoxelDim; ++iSubZ) {
+			for (int iSubZ = 0; iSubZ < iRaysPerVoxelDim; ++iSubZ) {
 
 				const float fUNum = fCuc + fXs * fCux + fYs * fCuy + fZs * fCuz;
 				const float fVNum = fCvc + fXs * fCvx + fYs * fCvy + fZs * fCvz;
@@ -248,7 +248,7 @@ __global__ void dev_cone_BP_SS(void* D_volData, unsigned int volPitch, int start
 bool ConeBP_Array(cudaPitchedPtr D_volumeData,
                   cudaArray *D_projArray,
                   const SDimensions3D& dims, const SConeProjection* angles,
-                  float fOutputScale)
+                  const SProjectorParams3D& params)
 {
 	bindProjDataTexture(D_projArray);
 
@@ -295,10 +295,10 @@ bool ConeBP_Array(cudaPitchedPtr D_volumeData,
 
 		for (unsigned int i = 0; i < angleCount; i += g_anglesPerBlock) {
 		// printf("Calling BP: %d, %dx%d, %dx%d to %p\n", i, dimBlock.x, dimBlock.y, dimGrid.x, dimGrid.y, (void*)D_volumeData.ptr); 
-			if (dims.iRaysPerVoxelDim == 1)
-				dev_cone_BP<<<dimGrid, dimBlock>>>(D_volumeData.ptr, D_volumeData.pitch/sizeof(float), i, th, dims, fOutputScale);
+			if (params.iRaysPerVoxelDim == 1)
+				dev_cone_BP<<<dimGrid, dimBlock>>>(D_volumeData.ptr, D_volumeData.pitch/sizeof(float), i, th, dims, params.fOutputScale);
 			else
-				dev_cone_BP_SS<<<dimGrid, dimBlock>>>(D_volumeData.ptr, D_volumeData.pitch/sizeof(float), i, th, dims, fOutputScale);
+				dev_cone_BP_SS<<<dimGrid, dimBlock>>>(D_volumeData.ptr, D_volumeData.pitch/sizeof(float), i, th, dims, params.iRaysPerVoxelDim, params.fOutputScale);
 		}
 
 		cudaTextForceKernelsCompletion();
@@ -315,14 +315,14 @@ bool ConeBP_Array(cudaPitchedPtr D_volumeData,
 bool ConeBP(cudaPitchedPtr D_volumeData,
             cudaPitchedPtr D_projData,
             const SDimensions3D& dims, const SConeProjection* angles,
-            float fOutputScale)
+            const SProjectorParams3D& params)
 {
 	// transfer projections to array
 
 	cudaArray* cuArray = allocateProjectionArray(dims);
 	transferProjectionsToArray(D_projData, cuArray, dims);
 
-	bool ret = ConeBP_Array(D_volumeData, cuArray, dims, angles, fOutputScale);
+	bool ret = ConeBP_Array(D_volumeData, cuArray, dims, angles, params);
 
 	cudaFreeArray(cuArray);
 
diff --git a/cuda/3d/cone_bp.h b/cuda/3d/cone_bp.h
index 4d3d2dd..a6e2c23 100644
--- a/cuda/3d/cone_bp.h
+++ b/cuda/3d/cone_bp.h
@@ -34,12 +34,12 @@ namespace astraCUDA3d {
 _AstraExport bool ConeBP_Array(cudaPitchedPtr D_volumeData,
                   cudaArray *D_projArray,
                   const SDimensions3D& dims, const SConeProjection* angles,
-                  float fOutputScale);
+                  const SProjectorParams3D& params);
 
 _AstraExport bool ConeBP(cudaPitchedPtr D_volumeData,
             cudaPitchedPtr D_projData,
             const SDimensions3D& dims, const SConeProjection* angles,
-            float fOutputScale);
+            const SProjectorParams3D& params);
          
 }
 
diff --git a/cuda/3d/cone_fp.cu b/cuda/3d/cone_fp.cu
index 13b184f..5a31b65 100644
--- a/cuda/3d/cone_fp.cu
+++ b/cuda/3d/cone_fp.cu
@@ -214,7 +214,7 @@ template<class COORD>
 __global__ void cone_FP_SS_t(float* D_projData, unsigned int projPitch,
                              unsigned int startSlice,
                              unsigned int startAngle, unsigned int endAngle,
-                             const SDimensions3D dims, float fOutputScale)
+                             const SDimensions3D dims, int iRaysPerDetDim, float fOutputScale)
 {
 	COORD c;
 
@@ -245,7 +245,7 @@ __global__ void cone_FP_SS_t(float* D_projData, unsigned int projPitch,
 	if (endSlice > c.nSlices(dims))
 		endSlice = c.nSlices(dims);
 
-	const float fSubStep = 1.0f/dims.iRaysPerDetDim;
+	const float fSubStep = 1.0f/iRaysPerDetDim;
 
 	for (int detectorV = startDetectorV; detectorV < endDetectorV; ++detectorV)
 	{
@@ -255,9 +255,9 @@ __global__ void cone_FP_SS_t(float* D_projData, unsigned int projPitch,
 		float fV = 0.0f;
 
 		float fdU = detectorU - 0.5f + 0.5f*fSubStep;
-		for (int iSubU = 0; iSubU < dims.iRaysPerDetDim; ++iSubU, fdU+=fSubStep) {
+		for (int iSubU = 0; iSubU < iRaysPerDetDim; ++iSubU, fdU+=fSubStep) {
 		float fdV = detectorV - 0.5f + 0.5f*fSubStep;
-		for (int iSubV = 0; iSubV < dims.iRaysPerDetDim; ++iSubV, fdV+=fSubStep) {
+		for (int iSubV = 0; iSubV < iRaysPerDetDim; ++iSubV, fdV+=fSubStep) {
 
 		const float fDetX = fDetSX + fdU*fDetUX + fdV*fDetVX;
 		const float fDetY = fDetSY + fdU*fDetUY + fdV*fDetVY;
@@ -294,14 +294,14 @@ __global__ void cone_FP_SS_t(float* D_projData, unsigned int projPitch,
 		}
 		}
 
-		D_projData[(detectorV*dims.iProjAngles+angle)*projPitch+detectorU] += fV / (dims.iRaysPerDetDim * dims.iRaysPerDetDim);
+		D_projData[(detectorV*dims.iProjAngles+angle)*projPitch+detectorU] += fV / (iRaysPerDetDim * iRaysPerDetDim);
 	}
 }
 
 
 bool ConeFP_Array_internal(cudaPitchedPtr D_projData,
                   const SDimensions3D& dims, unsigned int angleCount, const SConeProjection* angles,
-                  float fOutputScale)
+                  const SProjectorParams3D& params)
 {
 	// transfer angles to constant memory
 	float* tmp = new float[angleCount];
@@ -373,22 +373,22 @@ bool ConeFP_Array_internal(cudaPitchedPtr D_projData,
 
 				if (blockDirection == 0) {
 					for (unsigned int i = 0; i < dims.iVolX; i += g_blockSlices)
-						if (dims.iRaysPerDetDim == 1)
-							cone_FP_t<DIR_X><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
+						if (params.iRaysPerDetDim == 1)
+							cone_FP_t<DIR_X><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, params.fOutputScale);
 						else
-							cone_FP_SS_t<DIR_X><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
+							cone_FP_SS_t<DIR_X><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, params.iRaysPerDetDim, params.fOutputScale);
 				} else if (blockDirection == 1) {
 					for (unsigned int i = 0; i < dims.iVolY; i += g_blockSlices)
-						if (dims.iRaysPerDetDim == 1)
-							cone_FP_t<DIR_Y><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
+						if (params.iRaysPerDetDim == 1)
+							cone_FP_t<DIR_Y><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, params.fOutputScale);
 						else
-							cone_FP_SS_t<DIR_Y><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
+							cone_FP_SS_t<DIR_Y><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, params.iRaysPerDetDim, params.fOutputScale);
 				} else if (blockDirection == 2) {
 					for (unsigned int i = 0; i < dims.iVolZ; i += g_blockSlices)
-						if (dims.iRaysPerDetDim == 1)
-							cone_FP_t<DIR_Z><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
+						if (params.iRaysPerDetDim == 1)
+							cone_FP_t<DIR_Z><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, params.fOutputScale);
 						else
-							cone_FP_SS_t<DIR_Z><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
+							cone_FP_SS_t<DIR_Z><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, params.iRaysPerDetDim, params.fOutputScale);
 				}
 
 			}
@@ -414,7 +414,7 @@ bool ConeFP_Array_internal(cudaPitchedPtr D_projData,
 bool ConeFP(cudaPitchedPtr D_volumeData,
             cudaPitchedPtr D_projData,
             const SDimensions3D& dims, const SConeProjection* angles,
-            float fOutputScale)
+            const SProjectorParams3D& params)
 {
 	// transfer volume to array
 
@@ -434,7 +434,7 @@ bool ConeFP(cudaPitchedPtr D_volumeData,
 
 		ret = ConeFP_Array_internal(D_subprojData,
 		                            dims, iEndAngle - iAngle, angles + iAngle,
-		                            fOutputScale);
+		                            params);
 		if (!ret)
 			break;
 	}
diff --git a/cuda/3d/cone_fp.h b/cuda/3d/cone_fp.h
index 969a6d8..62c9caa 100644
--- a/cuda/3d/cone_fp.h
+++ b/cuda/3d/cone_fp.h
@@ -34,12 +34,12 @@ namespace astraCUDA3d {
 _AstraExport bool ConeFP_Array(cudaArray *D_volArray,
                   cudaPitchedPtr D_projData,
                   const SDimensions3D& dims, const SConeProjection* angles,
-                  float fOutputScale);
+                  const SProjectorParams3D& params);
 
 _AstraExport bool ConeFP(cudaPitchedPtr D_volumeData,
             cudaPitchedPtr D_projData,
             const SDimensions3D& dims, const SConeProjection* angles,
-            float fOutputScale);
+            const SProjectorParams3D& params);
 
 }
 
diff --git a/cuda/3d/dims3d.h b/cuda/3d/dims3d.h
index 5437a85..569b395 100644
--- a/cuda/3d/dims3d.h
+++ b/cuda/3d/dims3d.h
@@ -37,6 +37,13 @@ namespace astraCUDA3d {
 using astra::SConeProjection;
 using astra::SPar3DProjection;
 
+
+enum Cuda3DProjectionKernel {
+	ker3d_default = 0,
+	ker3d_sum_square_weights
+};
+
+
 struct SDimensions3D {
 	unsigned int iVolX;
 	unsigned int iVolY;
@@ -44,8 +51,19 @@ struct SDimensions3D {
 	unsigned int iProjAngles;
 	unsigned int iProjU; // number of detectors in the U direction
 	unsigned int iProjV; // number of detectors in the V direction
+};
+
+struct SProjectorParams3D {
+	SProjectorParams3D() :
+	    iRaysPerDetDim(1), iRaysPerVoxelDim(1),
+	    fOutputScale(1.0f),
+	    ker(ker3d_default)
+	{ }
+
 	unsigned int iRaysPerDetDim;
 	unsigned int iRaysPerVoxelDim;
+	float fOutputScale;
+	Cuda3DProjectionKernel ker;
 };
 
 }
diff --git a/cuda/3d/mem3d.cu b/cuda/3d/mem3d.cu
index 6d81dc0..d09c203 100644
--- a/cuda/3d/mem3d.cu
+++ b/cuda/3d/mem3d.cu
@@ -174,17 +174,17 @@ bool copyFromGPUMemory(float *dst, MemHandle3D src, const SSubDimensions3D &pos)
 bool FP(const astra::CProjectionGeometry3D* pProjGeom, MemHandle3D projData, const astra::CVolumeGeometry3D* pVolGeom, MemHandle3D volData, int iDetectorSuperSampling, astra::Cuda3DProjectionKernel projKernel)
 {
 	SDimensions3D dims;
+	SProjectorParams3D params;
 
 	bool ok = convertAstraGeometry_dims(pVolGeom, pProjGeom, dims);
 	if (!ok)
 		return false;
 
 #if 1
-	dims.iRaysPerDetDim = iDetectorSuperSampling;
+	params.iRaysPerDetDim = iDetectorSuperSampling;
 	if (iDetectorSuperSampling == 0)
 		return false;
 #else
-	dims.iRaysPerDetDim = 1;
 	astra::Cuda3DProjectionKernel projKernel = astra::ker3d_default;
 #endif
 
@@ -192,11 +192,9 @@ bool FP(const astra::CProjectionGeometry3D* pProjGeom, MemHandle3D projData, con
 	SPar3DProjection* pParProjs;
 	SConeProjection* pConeProjs;
 
-	float outputScale = 1.0f;
-
 	ok = convertAstraGeometry(pVolGeom, pProjGeom,
 	                          pParProjs, pConeProjs,
-	                          outputScale);
+	                          params);
 
 	if (pParProjs) {
 #if 0
@@ -211,10 +209,10 @@ bool FP(const astra::CProjectionGeometry3D* pProjGeom, MemHandle3D projData, con
 
 		switch (projKernel) {
 		case astra::ker3d_default:
-			ok &= Par3DFP(volData.d->ptr, projData.d->ptr, dims, pParProjs, outputScale);
+			ok &= Par3DFP(volData.d->ptr, projData.d->ptr, dims, pParProjs, params);
 			break;
 		case astra::ker3d_sum_square_weights:
-			ok &= Par3DFP_SumSqW(volData.d->ptr, projData.d->ptr, dims, pParProjs, outputScale*outputScale);
+			ok &= Par3DFP_SumSqW(volData.d->ptr, projData.d->ptr, dims, pParProjs, params);
 			break;
 		default:
 			ok = false;
@@ -222,7 +220,7 @@ bool FP(const astra::CProjectionGeometry3D* pProjGeom, MemHandle3D projData, con
 	} else {
 		switch (projKernel) {
 		case astra::ker3d_default:
-			ok &= ConeFP(volData.d->ptr, projData.d->ptr, dims, pConeProjs, outputScale);
+			ok &= ConeFP(volData.d->ptr, projData.d->ptr, dims, pConeProjs, params);
 			break;
 		default:
 			ok = false;
@@ -235,30 +233,27 @@ bool FP(const astra::CProjectionGeometry3D* pProjGeom, MemHandle3D projData, con
 bool BP(const astra::CProjectionGeometry3D* pProjGeom, MemHandle3D projData, const astra::CVolumeGeometry3D* pVolGeom, MemHandle3D volData, int iVoxelSuperSampling)
 {
 	SDimensions3D dims;
+	SProjectorParams3D params;
 
 	bool ok = convertAstraGeometry_dims(pVolGeom, pProjGeom, dims);
 	if (!ok)
 		return false;
 
 #if 1
-	dims.iRaysPerVoxelDim = iVoxelSuperSampling;
-#else
-	dims.iRaysPerVoxelDim = 1;
+	params.iRaysPerVoxelDim = iVoxelSuperSampling;
 #endif
 
 	SPar3DProjection* pParProjs;
 	SConeProjection* pConeProjs;
 
-	float outputScale = 1.0f;
-
 	ok = convertAstraGeometry(pVolGeom, pProjGeom,
 	                          pParProjs, pConeProjs,
-	                          outputScale);
+	                          params);
 
 	if (pParProjs)
-		ok &= Par3DBP(volData.d->ptr, projData.d->ptr, dims, pParProjs, outputScale);
+		ok &= Par3DBP(volData.d->ptr, projData.d->ptr, dims, pParProjs, params);
 	else
-		ok &= ConeBP(volData.d->ptr, projData.d->ptr, dims, pConeProjs, outputScale);
+		ok &= ConeBP(volData.d->ptr, projData.d->ptr, dims, pConeProjs, params);
 
 	return ok;
 
diff --git a/cuda/3d/par3d_bp.cu b/cuda/3d/par3d_bp.cu
index cafab46..40f839d 100644
--- a/cuda/3d/par3d_bp.cu
+++ b/cuda/3d/par3d_bp.cu
@@ -143,7 +143,7 @@ __global__ void dev_par3D_BP(void* D_volData, unsigned int volPitch, int startAn
 }
 
 // supersampling version
-__global__ void dev_par3D_BP_SS(void* D_volData, unsigned int volPitch, int startAngle, int angleOffset, const SDimensions3D dims, float fOutputScale)
+__global__ void dev_par3D_BP_SS(void* D_volData, unsigned int volPitch, int startAngle, int angleOffset, const SDimensions3D dims, int iRaysPerVoxelDim, float fOutputScale)
 {
 	float* volData = (float*)D_volData;
 
@@ -174,13 +174,13 @@ __global__ void dev_par3D_BP_SS(void* D_volData, unsigned int volPitch, int star
 	if (endZ > dims.iVolZ)
 		endZ = dims.iVolZ;
 
-	float fX = X - 0.5f*dims.iVolX + 0.5f - 0.5f + 0.5f/dims.iRaysPerVoxelDim;
-	float fY = Y - 0.5f*dims.iVolY + 0.5f - 0.5f + 0.5f/dims.iRaysPerVoxelDim;
-	float fZ = startZ - 0.5f*dims.iVolZ + 0.5f - 0.5f + 0.5f/dims.iRaysPerVoxelDim;
+	float fX = X - 0.5f*dims.iVolX + 0.5f - 0.5f + 0.5f/iRaysPerVoxelDim;
+	float fY = Y - 0.5f*dims.iVolY + 0.5f - 0.5f + 0.5f/iRaysPerVoxelDim;
+	float fZ = startZ - 0.5f*dims.iVolZ + 0.5f - 0.5f + 0.5f/iRaysPerVoxelDim;
 
-	const float fSubStep = 1.0f/dims.iRaysPerVoxelDim;
+	const float fSubStep = 1.0f/iRaysPerVoxelDim;
 
-	fOutputScale /= (dims.iRaysPerVoxelDim*dims.iRaysPerVoxelDim*dims.iRaysPerVoxelDim);
+	fOutputScale /= (iRaysPerVoxelDim*iRaysPerVoxelDim*iRaysPerVoxelDim);
 
 
 	for (int Z = startZ; Z < endZ; ++Z, fZ += 1.0f)
@@ -201,11 +201,11 @@ __global__ void dev_par3D_BP_SS(void* D_volData, unsigned int volPitch, int star
 			const float fCvc = gC_C[8*angle+7];
 
 			float fXs = fX;
-			for (int iSubX = 0; iSubX < dims.iRaysPerVoxelDim; ++iSubX) {
+			for (int iSubX = 0; iSubX < iRaysPerVoxelDim; ++iSubX) {
 			float fYs = fY;
-			for (int iSubY = 0; iSubY < dims.iRaysPerVoxelDim; ++iSubY) {
+			for (int iSubY = 0; iSubY < iRaysPerVoxelDim; ++iSubY) {
 			float fZs = fZ;
-			for (int iSubZ = 0; iSubZ < dims.iRaysPerVoxelDim; ++iSubZ) {
+			for (int iSubZ = 0; iSubZ < iRaysPerVoxelDim; ++iSubZ) {
 
 				const float fU = fCuc + fXs * fCux + fYs * fCuy + fZs * fCuz;
 				const float fV = fCvc + fXs * fCvx + fYs * fCvy + fZs * fCvz;
@@ -228,7 +228,7 @@ __global__ void dev_par3D_BP_SS(void* D_volData, unsigned int volPitch, int star
 bool Par3DBP_Array(cudaPitchedPtr D_volumeData,
                    cudaArray *D_projArray,
                    const SDimensions3D& dims, const SPar3DProjection* angles,
-                   float fOutputScale)
+                   const SProjectorParams3D& params)
 {
 	bindProjDataTexture(D_projArray);
 
@@ -274,10 +274,10 @@ bool Par3DBP_Array(cudaPitchedPtr D_volumeData,
 
 		for (unsigned int i = 0; i < angleCount; i += g_anglesPerBlock) {
 			// printf("Calling BP: %d, %dx%d, %dx%d to %p\n", i, dimBlock.x, dimBlock.y, dimGrid.x, dimGrid.y, (void*)D_volumeData.ptr); 
-			if (dims.iRaysPerVoxelDim == 1)
-				dev_par3D_BP<<<dimGrid, dimBlock>>>(D_volumeData.ptr, D_volumeData.pitch/sizeof(float), i, th, dims, fOutputScale);
+			if (params.iRaysPerVoxelDim == 1)
+				dev_par3D_BP<<<dimGrid, dimBlock>>>(D_volumeData.ptr, D_volumeData.pitch/sizeof(float), i, th, dims, params.fOutputScale);
 			else
-				dev_par3D_BP_SS<<<dimGrid, dimBlock>>>(D_volumeData.ptr, D_volumeData.pitch/sizeof(float), i, th, dims, fOutputScale);
+				dev_par3D_BP_SS<<<dimGrid, dimBlock>>>(D_volumeData.ptr, D_volumeData.pitch/sizeof(float), i, th, dims, params.iRaysPerVoxelDim, params.fOutputScale);
 		}
 
 		cudaTextForceKernelsCompletion();
@@ -293,14 +293,14 @@ bool Par3DBP_Array(cudaPitchedPtr D_volumeData,
 bool Par3DBP(cudaPitchedPtr D_volumeData,
             cudaPitchedPtr D_projData,
             const SDimensions3D& dims, const SPar3DProjection* angles,
-            float fOutputScale)
+            const SProjectorParams3D& params)
 {
 	// transfer projections to array
 
 	cudaArray* cuArray = allocateProjectionArray(dims);
 	transferProjectionsToArray(D_projData, cuArray, dims);
 
-	bool ret = Par3DBP_Array(D_volumeData, cuArray, dims, angles, fOutputScale);
+	bool ret = Par3DBP_Array(D_volumeData, cuArray, dims, angles, params);
 
 	cudaFreeArray(cuArray);
 
diff --git a/cuda/3d/par3d_bp.h b/cuda/3d/par3d_bp.h
index f1fc62d..3efad19 100644
--- a/cuda/3d/par3d_bp.h
+++ b/cuda/3d/par3d_bp.h
@@ -34,12 +34,12 @@ namespace astraCUDA3d {
 _AstraExport bool Par3DBP_Array(cudaPitchedPtr D_volumeData,
                    cudaArray *D_projArray,
                    const SDimensions3D& dims, const SPar3DProjection* angles,
-                   float fOutputScale);
+                   const SProjectorParams3D& params);
 
 _AstraExport bool Par3DBP(cudaPitchedPtr D_volumeData,
              cudaPitchedPtr D_projData,
              const SDimensions3D& dims, const SPar3DProjection* angles,
-             float fOutputScale);
+             const SProjectorParams3D& params);
          
 
 }
diff --git a/cuda/3d/par3d_fp.cu b/cuda/3d/par3d_fp.cu
index 3ce3d42..fde9c2c 100644
--- a/cuda/3d/par3d_fp.cu
+++ b/cuda/3d/par3d_fp.cu
@@ -218,7 +218,7 @@ template<class COORD>
 __global__ void par3D_FP_SS_t(float* D_projData, unsigned int projPitch,
                               unsigned int startSlice,
                               unsigned int startAngle, unsigned int endAngle,
-                              const SDimensions3D dims, float fOutputScale)
+                              const SDimensions3D dims, int iRaysPerDetDim, float fOutputScale)
 {
 	COORD c;
 
@@ -251,7 +251,7 @@ __global__ void par3D_FP_SS_t(float* D_projData, unsigned int projPitch,
 	if (endSlice > c.nSlices(dims))
 		endSlice = c.nSlices(dims);
 
-	const float fSubStep = 1.0f/dims.iRaysPerDetDim;
+	const float fSubStep = 1.0f/iRaysPerDetDim;
 
 	for (int detectorV = startDetectorV; detectorV < endDetectorV; ++detectorV)
 	{
@@ -259,9 +259,9 @@ __global__ void par3D_FP_SS_t(float* D_projData, unsigned int projPitch,
 		float fV = 0.0f;
 
 		float fdU = detectorU - 0.5f + 0.5f*fSubStep;
-		for (int iSubU = 0; iSubU < dims.iRaysPerDetDim; ++iSubU, fdU+=fSubStep) {
+		for (int iSubU = 0; iSubU < iRaysPerDetDim; ++iSubU, fdU+=fSubStep) {
 		float fdV = detectorV - 0.5f + 0.5f*fSubStep;
-		for (int iSubV = 0; iSubV < dims.iRaysPerDetDim; ++iSubV, fdV+=fSubStep) {
+		for (int iSubV = 0; iSubV < iRaysPerDetDim; ++iSubV, fdV+=fSubStep) {
 
 		/* Trace ray in direction Ray to (detectorU,detectorV) from  */
 		/* X = startSlice to X = endSlice                            */
@@ -301,7 +301,7 @@ __global__ void par3D_FP_SS_t(float* D_projData, unsigned int projPitch,
 		}
 		}
 
-		D_projData[(detectorV*dims.iProjAngles+angle)*projPitch+detectorU] += fV / (dims.iRaysPerDetDim * dims.iRaysPerDetDim);
+		D_projData[(detectorV*dims.iProjAngles+angle)*projPitch+detectorU] += fV / (iRaysPerDetDim * iRaysPerDetDim);
 	}
 }
 
@@ -401,7 +401,7 @@ __global__ void par3D_FP_SumSqW_t(float* D_projData, unsigned int projPitch,
 
 bool Par3DFP_Array_internal(cudaPitchedPtr D_projData,
                    const SDimensions3D& dims, unsigned int angleCount, const SPar3DProjection* angles,
-                   float fOutputScale)
+                   const SProjectorParams3D& params)
 {
 	// transfer angles to constant memory
 	float* tmp = new float[dims.iProjAngles];
@@ -473,22 +473,22 @@ bool Par3DFP_Array_internal(cudaPitchedPtr D_projData,
 
 				if (blockDirection == 0) {
 					for (unsigned int i = 0; i < dims.iVolX; i += g_blockSlices)
-						if (dims.iRaysPerDetDim == 1)
-							par3D_FP_t<DIR_X><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
+						if (params.iRaysPerDetDim == 1)
+							par3D_FP_t<DIR_X><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, params.fOutputScale);
 						else
-							par3D_FP_SS_t<DIR_X><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
+							par3D_FP_SS_t<DIR_X><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, params.iRaysPerDetDim, params.fOutputScale);
 				} else if (blockDirection == 1) {
 					for (unsigned int i = 0; i < dims.iVolY; i += g_blockSlices)
-						if (dims.iRaysPerDetDim == 1)
-							par3D_FP_t<DIR_Y><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
+						if (params.iRaysPerDetDim == 1)
+							par3D_FP_t<DIR_Y><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, params.fOutputScale);
 						else
-							par3D_FP_SS_t<DIR_Y><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
+							par3D_FP_SS_t<DIR_Y><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, params.iRaysPerDetDim, params.fOutputScale);
 				} else if (blockDirection == 2) {
 					for (unsigned int i = 0; i < dims.iVolZ; i += g_blockSlices)
-						if (dims.iRaysPerDetDim == 1)
-							par3D_FP_t<DIR_Z><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
+						if (params.iRaysPerDetDim == 1)
+							par3D_FP_t<DIR_Z><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, params.fOutputScale);
 						else
-							par3D_FP_SS_t<DIR_Z><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
+							par3D_FP_SS_t<DIR_Z><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, params.iRaysPerDetDim, params.fOutputScale);
 				}
 
 			}
@@ -514,7 +514,7 @@ bool Par3DFP_Array_internal(cudaPitchedPtr D_projData,
 bool Par3DFP(cudaPitchedPtr D_volumeData,
              cudaPitchedPtr D_projData,
              const SDimensions3D& dims, const SPar3DProjection* angles,
-             float fOutputScale)
+             const SProjectorParams3D& params)
 {
 	// transfer volume to array
 	cudaArray* cuArray = allocateVolumeArray(dims);
@@ -533,7 +533,7 @@ bool Par3DFP(cudaPitchedPtr D_volumeData,
 
 		ret = Par3DFP_Array_internal(D_subprojData,
 		                             dims, iEndAngle - iAngle, angles + iAngle,
-		                             fOutputScale);
+		                             params);
 		if (!ret)
 			break;
 	}
@@ -548,7 +548,7 @@ bool Par3DFP(cudaPitchedPtr D_volumeData,
 bool Par3DFP_SumSqW(cudaPitchedPtr D_volumeData,
                     cudaPitchedPtr D_projData,
                     const SDimensions3D& dims, const SPar3DProjection* angles,
-                    float fOutputScale)
+                    const SProjectorParams3D& params)
 {
 	// transfer angles to constant memory
 	float* tmp = new float[dims.iProjAngles];
@@ -620,8 +620,8 @@ bool Par3DFP_SumSqW(cudaPitchedPtr D_volumeData,
 
 				if (blockDirection == 0) {
 					for (unsigned int i = 0; i < dims.iVolX; i += g_blockSlices)
-						if (dims.iRaysPerDetDim == 1)
-							par3D_FP_SumSqW_t<DIR_X><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
+						if (params.iRaysPerDetDim == 1)
+							par3D_FP_SumSqW_t<DIR_X><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, params.fOutputScale);
 						else
 #if 0
 							par3D_FP_SS_SumSqW_dirX<<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
@@ -630,8 +630,8 @@ bool Par3DFP_SumSqW(cudaPitchedPtr D_volumeData,
 #endif
 				} else if (blockDirection == 1) {
 					for (unsigned int i = 0; i < dims.iVolY; i += g_blockSlices)
-						if (dims.iRaysPerDetDim == 1)
-							par3D_FP_SumSqW_t<DIR_Y><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
+						if (params.iRaysPerDetDim == 1)
+							par3D_FP_SumSqW_t<DIR_Y><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, params.fOutputScale);
 						else
 #if 0
 							par3D_FP_SS_SumSqW_dirY<<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
@@ -640,8 +640,8 @@ bool Par3DFP_SumSqW(cudaPitchedPtr D_volumeData,
 #endif
 				} else if (blockDirection == 2) {
 					for (unsigned int i = 0; i < dims.iVolZ; i += g_blockSlices)
-						if (dims.iRaysPerDetDim == 1)
-							par3D_FP_SumSqW_t<DIR_Z><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
+						if (params.iRaysPerDetDim == 1)
+							par3D_FP_SumSqW_t<DIR_Z><<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, params.fOutputScale);
 						else
 #if 0
 							par3D_FP_SS_SumSqW_dirZ<<<dimGrid, dimBlock, 0, stream>>>((float*)D_projData.ptr, D_projData.pitch/sizeof(float), i, blockStart, blockEnd, dims, fOutputScale);
diff --git a/cuda/3d/par3d_fp.h b/cuda/3d/par3d_fp.h
index 41f204f..5f65cd9 100644
--- a/cuda/3d/par3d_fp.h
+++ b/cuda/3d/par3d_fp.h
@@ -34,17 +34,17 @@ namespace astraCUDA3d {
 _AstraExport bool Par3DFP_Array(cudaArray *D_volArray,
                    cudaPitchedPtr D_projData,
                    const SDimensions3D& dims, const SPar3DProjection* angles,
-                   float fOutputScale);
+                   const SProjectorParams3D& params);
 
 _AstraExport bool Par3DFP(cudaPitchedPtr D_volumeData,
             cudaPitchedPtr D_projData,
             const SDimensions3D& dims, const SPar3DProjection* angles,
-            float fOutputScale);
+            const SProjectorParams3D& params);
 
 _AstraExport bool Par3DFP_SumSqW(cudaPitchedPtr D_volumeData,
                     cudaPitchedPtr D_projData,
                     const SDimensions3D& dims, const SPar3DProjection* angles,
-                    float fOutputScale);
+                    const SProjectorParams3D& params);
 
 }
 
diff --git a/cuda/3d/sirt3d.cu b/cuda/3d/sirt3d.cu
index 484521e..4cb35c3 100644
--- a/cuda/3d/sirt3d.cu
+++ b/cuda/3d/sirt3d.cu
@@ -347,7 +347,7 @@ bool doSIRT(cudaPitchedPtr& D_volumeData,
 	SIRT sirt;
 	bool ok = true;
 
-	ok &= sirt.setConeGeometry(dims, angles, 1.0f);
+	ok &= sirt.setConeGeometry(dims, angles, SProjectorParams3D());
 	if (D_maskData.ptr)
 		ok &= sirt.enableVolumeMask();