More gracefully handle config errors in geometries

11 files changed, 240 insertions, 123 deletions

diff --git a/src/ConeProjectionGeometry3D.cpp b/src/ConeProjectionGeometry3D.cpp
index 90adfa8..8022591 100644
--- a/src/ConeProjectionGeometry3D.cpp
+++ b/src/ConeProjectionGeometry3D.cpp
@@ -88,13 +88,21 @@ bool CConeProjectionGeometry3D::initialize(const Config& _cfg)
 	// Required: DistanceOriginDetector
 	XMLNode node = _cfg.self.getSingleNode("DistanceOriginDetector");
 	ASTRA_CONFIG_CHECK(node, "ConeProjectionGeometry3D", "No DistanceOriginDetector tag specified.");
-	m_fOriginDetectorDistance = node.getContentNumerical();
+	try {
+		m_fOriginDetectorDistance = node.getContentNumerical();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "ConeProjectionGeometry3D", "DistanceOriginDetector must be numerical.");
+	}
 	CC.markNodeParsed("DistanceOriginDetector");
 
 	// Required: DetectorOriginSource
 	node = _cfg.self.getSingleNode("DistanceOriginSource");
 	ASTRA_CONFIG_CHECK(node, "ConeProjectionGeometry3D", "No DistanceOriginSource tag specified.");
-	m_fOriginSourceDistance = node.getContentNumerical();
+	try {
+		m_fOriginSourceDistance = node.getContentNumerical();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "ConeProjectionGeometry3D", "DistanceOriginSource must be numerical.");
+	}
 	CC.markNodeParsed("DistanceOriginSource");
 
 	// success
diff --git a/src/ConeVecProjectionGeometry3D.cpp b/src/ConeVecProjectionGeometry3D.cpp
index 0e0f70b..177a0c7 100644
--- a/src/ConeVecProjectionGeometry3D.cpp
+++ b/src/ConeVecProjectionGeometry3D.cpp
@@ -72,29 +72,27 @@ bool CConeVecProjectionGeometry3D::initialize(const Config& _cfg)
 	ASTRA_ASSERT(_cfg.self);
 	ConfigStackCheck<CProjectionGeometry3D> CC("ConeVecProjectionGeometry3D", this, _cfg);	
 
-	XMLNode node;
-
-	// TODO: Fix up class hierarchy... this class doesn't fit very well.
 	// initialization of parent class
-	//CProjectionGeometry3D::initialize(_cfg);
+	CProjectionGeometry3D::initialize(_cfg);
 
-	// Required: DetectorRowCount
-	node = _cfg.self.getSingleNode("DetectorRowCount");
-	ASTRA_CONFIG_CHECK(node, "ConeVecProjectionGeometry3D", "No DetectorRowCount tag specified.");
-	m_iDetectorRowCount = node.getContentInt();
-	CC.markNodeParsed("DetectorRowCount");
+	// success
+	m_bInitialized = _check();
+	return m_bInitialized;
+}
 
-	// Required: DetectorColCount
-	node = _cfg.self.getSingleNode("DetectorColCount");
-	ASTRA_CONFIG_CHECK(node, "ConeVecProjectionGeometry3D", "No DetectorColCount tag specified.");
-	m_iDetectorColCount = node.getContentInt();
-	m_iDetectorTotCount = m_iDetectorRowCount * m_iDetectorColCount;
-	CC.markNodeParsed("DetectorColCount");
+bool CConeVecProjectionGeometry3D::initializeAngles(const Config& _cfg)
+{
+	ConfigStackCheck<CProjectionGeometry3D> CC("ConeVecProjectionGeometry3D", this, _cfg);
 
 	// Required: Vectors
-	node = _cfg.self.getSingleNode("Vectors");
+	XMLNode node = _cfg.self.getSingleNode("Vectors");
 	ASTRA_CONFIG_CHECK(node, "ConeVecProjectionGeometry3D", "No Vectors tag specified.");
-	vector<double> data = node.getContentNumericalArrayDouble();
+	vector<double> data;
+	try {
+		data = node.getContentNumericalArrayDouble();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "ConeVecProjectionGeometry3D", "Vectors must be a numerical matrix.");
+	}
 	CC.markNodeParsed("Vectors");
 	ASTRA_CONFIG_CHECK(data.size() % 12 == 0, "ConeVecProjectionGeometry3D", "Vectors doesn't consist of 12-tuples.");
 	m_iProjectionAngleCount = data.size() / 12;
@@ -119,9 +117,7 @@ bool CConeVecProjectionGeometry3D::initialize(const Config& _cfg)
 		p.fDetSZ = data[12*i +  5] - 0.5f * m_iDetectorRowCount * p.fDetVZ - 0.5f * m_iDetectorColCount * p.fDetUZ;
 	}
 
-	// success
-	m_bInitialized = _check();
-	return m_bInitialized;
+	return true;
 }
 
 //----------------------------------------------------------------------------------------
diff --git a/src/FanFlatProjectionGeometry2D.cpp b/src/FanFlatProjectionGeometry2D.cpp
index da9133c..901cd7c 100644
--- a/src/FanFlatProjectionGeometry2D.cpp
+++ b/src/FanFlatProjectionGeometry2D.cpp
@@ -136,13 +136,21 @@ bool CFanFlatProjectionGeometry2D::initialize(const Config& _cfg)
 	// Required: DistanceOriginDetector
 	XMLNode node = _cfg.self.getSingleNode("DistanceOriginDetector");
 	ASTRA_CONFIG_CHECK(node, "FanFlatProjectionGeometry2D", "No DistanceOriginDetector tag specified.");
-	m_fOriginDetectorDistance = node.getContentNumerical();
+	try {
+		m_fOriginDetectorDistance = node.getContentNumerical();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "FanFlatProjectionGeometry2D", "DistanceOriginDetector must be numerical.");
+	}
 	CC.markNodeParsed("DistanceOriginDetector");
 
 	// Required: DetectorOriginSource
 	node = _cfg.self.getSingleNode("DistanceOriginSource");
 	ASTRA_CONFIG_CHECK(node, "FanFlatProjectionGeometry2D", "No DistanceOriginSource tag specified.");
-	m_fOriginSourceDistance = node.getContentNumerical();
+	try {
+		m_fOriginSourceDistance = node.getContentNumerical();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "FanFlatProjectionGeometry2D", "DistanceOriginSource must be numerical.");
+	}
 	CC.markNodeParsed("DistanceOriginSource");
 
 	// success
diff --git a/src/FanFlatVecProjectionGeometry2D.cpp b/src/FanFlatVecProjectionGeometry2D.cpp
index 2a19233..074194b 100644
--- a/src/FanFlatVecProjectionGeometry2D.cpp
+++ b/src/FanFlatVecProjectionGeometry2D.cpp
@@ -116,22 +116,30 @@ bool CFanFlatVecProjectionGeometry2D::initialize(const Config& _cfg)
 
 	XMLNode node;
 
-	// TODO: Fix up class hierarchy... this class doesn't fit very well.
 	// initialization of parent class
-	//CProjectionGeometry2D::initialize(_cfg);
+	CProjectionGeometry2D::initialize(_cfg);
 
-	// Required: DetectorCount
-	node = _cfg.self.getSingleNode("DetectorCount");
-	ASTRA_CONFIG_CHECK(node, "FanFlatVecProjectionGeometry3D", "No DetectorRowCount tag specified.");
-	m_iDetectorCount = node.getContentInt();
-	CC.markNodeParsed("DetectorCount");
+
+	// success
+	m_bInitialized = _check();
+	return m_bInitialized;
+}
+
+bool CFanFlatVecProjectionGeometry2D::initializeAngles(const Config& _cfg)
+{
+	ConfigStackCheck<CProjectionGeometry2D> CC("FanFlatVecProjectionGeometry2D", this, _cfg);
 
 	// Required: Vectors
-	node = _cfg.self.getSingleNode("Vectors");
-	ASTRA_CONFIG_CHECK(node, "FanFlatVecProjectionGeometry3D", "No Vectors tag specified.");
-	vector<float32> data = node.getContentNumericalArray();
+	XMLNode node = _cfg.self.getSingleNode("Vectors");
+	ASTRA_CONFIG_CHECK(node, "FanFlatVecProjectionGeometry2D", "No Vectors tag specified.");
+	vector<float32> data;
+	try {
+		data = node.getContentNumericalArray();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "FanFlatVecProjectionGeometry2D", "Vectors must be a numerical matrix.");
+	}
 	CC.markNodeParsed("Vectors");
-	ASTRA_CONFIG_CHECK(data.size() % 6 == 0, "FanFlatVecProjectionGeometry3D", "Vectors doesn't consist of 6-tuples.");
+	ASTRA_CONFIG_CHECK(data.size() % 6 == 0, "FanFlatVecProjectionGeometry2D", "Vectors doesn't consist of 6-tuples.");
 	m_iProjectionAngleCount = data.size() / 6;
 	m_pProjectionAngles = new SFanProjection[m_iProjectionAngleCount];
 
@@ -148,11 +156,7 @@ bool CFanFlatVecProjectionGeometry2D::initialize(const Config& _cfg)
 		p.fDetSY = data[6*i +  3] - 0.5f * m_iDetectorCount * p.fDetUY;
 	}
 
-
-
-	// success
-	m_bInitialized = _check();
-	return m_bInitialized;
+	return true;
 }
 
 //----------------------------------------------------------------------------------------
diff --git a/src/ParallelVecProjectionGeometry2D.cpp b/src/ParallelVecProjectionGeometry2D.cpp
index 8905a26..30682c5 100644
--- a/src/ParallelVecProjectionGeometry2D.cpp
+++ b/src/ParallelVecProjectionGeometry2D.cpp
@@ -29,7 +29,6 @@ along with the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
 
 #include <cstring>
 #include <sstream>
-#include <boost/lexical_cast.hpp>
 
 using namespace std;
 
@@ -100,20 +99,29 @@ bool CParallelVecProjectionGeometry2D::initialize(const Config& _cfg)
 	ASTRA_ASSERT(_cfg.self);
 	ConfigStackCheck<CProjectionGeometry2D> CC("ParallelVecProjectionGeometry2D", this, _cfg);	
 
-	// TODO: Fix up class hierarchy... this class doesn't fit very well.
 	// initialization of parent class
-	//CProjectionGeometry2D::initialize(_cfg);
+	CProjectionGeometry2D::initialize(_cfg);
 
-	// Required: DetectorCount
-	XMLNode node = _cfg.self.getSingleNode("DetectorCount");
-	ASTRA_CONFIG_CHECK(node, "ParallelVecProjectionGeometry2D", "No DetectorRowCount tag specified.");
-	m_iDetectorCount = boost::lexical_cast<int>(node.getContent());
-	CC.markNodeParsed("DetectorCount");
+
+	// success
+	m_bInitialized = _check();
+	return m_bInitialized;
+}
+
+bool CParallelVecProjectionGeometry2D::initializeAngles(const Config& _cfg)
+{
+	ConfigStackCheck<CProjectionGeometry2D> CC("ParallelVecProjectionGeometry2D", this, _cfg);
 
 	// Required: Vectors
-	node = _cfg.self.getSingleNode("Vectors");
+	XMLNode node = _cfg.self.getSingleNode("Vectors");
 	ASTRA_CONFIG_CHECK(node, "ParallelVecProjectionGeometry2D", "No Vectors tag specified.");
-	vector<float32> data = node.getContentNumericalArray();
+	vector<float32> data;
+	try {
+		data = node.getContentNumericalArray();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "ParallelVecProjectionGeometry2D", "Vectors must be a numerical matrix.");
+	}
+
 	CC.markNodeParsed("Vectors");
 	ASTRA_CONFIG_CHECK(data.size() % 6 == 0, "ParallelVecProjectionGeometry2D", "Vectors doesn't consist of 6-tuples.");
 	m_iProjectionAngleCount = data.size() / 6;
@@ -132,9 +140,7 @@ bool CParallelVecProjectionGeometry2D::initialize(const Config& _cfg)
 		p.fDetSY = data[6*i +  3] - 0.5f * m_iDetectorCount * p.fDetUY;
 	}
 
-	// success
-	m_bInitialized = _check();
-	return m_bInitialized;
+	return true;
 }
 
 //----------------------------------------------------------------------------------------
@@ -215,12 +221,12 @@ Config* CParallelVecProjectionGeometry2D::getConfiguration() const
 	std::string vectors = "";
 	for (int i = 0; i < m_iProjectionAngleCount; ++i) {
 		SParProjection& p = m_pProjectionAngles[i];
-		vectors += boost::lexical_cast<string>(p.fRayX) + ",";
-		vectors += boost::lexical_cast<string>(p.fRayY) + ",";
-		vectors += boost::lexical_cast<string>(p.fDetSX + 0.5f * m_iDetectorCount * p.fDetUX) + ",";
-		vectors += boost::lexical_cast<string>(p.fDetSY + 0.5f * m_iDetectorCount * p.fDetUY) + ",";
-		vectors += boost::lexical_cast<string>(p.fDetUX) + ",";
-		vectors += boost::lexical_cast<string>(p.fDetUY);
+		vectors += StringUtil::toString(p.fRayX) + ",";
+		vectors += StringUtil::toString(p.fRayY) + ",";
+		vectors += StringUtil::toString(p.fDetSX + 0.5f * m_iDetectorCount * p.fDetUX) + ",";
+		vectors += StringUtil::toString(p.fDetSY + 0.5f * m_iDetectorCount * p.fDetUY) + ",";
+		vectors += StringUtil::toString(p.fDetUX) + ",";
+		vectors += StringUtil::toString(p.fDetUY);
 		if (i < m_iProjectionAngleCount-1) vectors += ';';
 	}
 	cfg->self.addChildNode("Vectors", vectors);
diff --git a/src/ParallelVecProjectionGeometry3D.cpp b/src/ParallelVecProjectionGeometry3D.cpp
index 58fc986..ed15b68 100644
--- a/src/ParallelVecProjectionGeometry3D.cpp
+++ b/src/ParallelVecProjectionGeometry3D.cpp
@@ -74,27 +74,27 @@ bool CParallelVecProjectionGeometry3D::initialize(const Config& _cfg)
 
 	XMLNode node;
 
-	// TODO: Fix up class hierarchy... this class doesn't fit very well.
 	// initialization of parent class
-	//CProjectionGeometry3D::initialize(_cfg);
+	CProjectionGeometry3D::initialize(_cfg);
 
-	// Required: DetectorRowCount
-	node = _cfg.self.getSingleNode("DetectorRowCount");
-	ASTRA_CONFIG_CHECK(node, "ParallelVecProjectionGeometry3D", "No DetectorRowCount tag specified.");
-	m_iDetectorRowCount = node.getContentInt();
-	CC.markNodeParsed("DetectorRowCount");
+	// success
+	m_bInitialized = _check();
+	return m_bInitialized;
+}
 
-	// Required: DetectorCount
-	node = _cfg.self.getSingleNode("DetectorColCount");
-	ASTRA_CONFIG_CHECK(node, "", "No DetectorColCount tag specified.");
-	m_iDetectorColCount = node.getContentInt();
-	m_iDetectorTotCount = m_iDetectorRowCount * m_iDetectorColCount;
-	CC.markNodeParsed("DetectorColCount");
+bool CParallelVecProjectionGeometry3D::initializeAngles(const Config& _cfg)
+{
+	ConfigStackCheck<CProjectionGeometry3D> CC("ParallelVecProjectionGeometry3D", this, _cfg);
 
 	// Required: Vectors
-	node = _cfg.self.getSingleNode("Vectors");
+	XMLNode node = _cfg.self.getSingleNode("Vectors");
 	ASTRA_CONFIG_CHECK(node, "ParallelVecProjectionGeometry3D", "No Vectors tag specified.");
-	vector<double> data = node.getContentNumericalArrayDouble();
+	vector<double> data;
+	try {
+		data = node.getContentNumericalArrayDouble();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "ParallelVecProjectionGeometry3D", "Vectors must be a numerical matrix.");
+	}
 	CC.markNodeParsed("Vectors");
 	ASTRA_CONFIG_CHECK(data.size() % 12 == 0, "ParallelVecProjectionGeometry3D", "Vectors doesn't consist of 12-tuples.");
 	m_iProjectionAngleCount = data.size() / 12;
@@ -119,9 +119,7 @@ bool CParallelVecProjectionGeometry3D::initialize(const Config& _cfg)
 		p.fDetSZ = data[12*i +  5] - 0.5f * m_iDetectorRowCount * p.fDetVZ - 0.5f * m_iDetectorColCount * p.fDetUZ;
 	}
 
-	// success
-	m_bInitialized = _check();
-	return m_bInitialized;
+	return true;
 }
 
 //----------------------------------------------------------------------------------------
diff --git a/src/ProjectionGeometry2D.cpp b/src/ProjectionGeometry2D.cpp
index 64674bf..15be1d5 100644
--- a/src/ProjectionGeometry2D.cpp
+++ b/src/ProjectionGeometry2D.cpp
@@ -116,22 +116,50 @@ bool CProjectionGeometry2D::initialize(const Config& _cfg)
 		clear();
 	}
 
+	// Required: DetectorCount
+	XMLNode node = _cfg.self.getSingleNode("DetectorCount");
+	ASTRA_CONFIG_CHECK(node, "ProjectionGeometry2D", "No DetectorCount tag specified.");
+	try {
+		m_iDetectorCount = node.getContentInt();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "ProjectionGeometry2D", "DetectorCount must be an integer.");
+	}
+	CC.markNodeParsed("DetectorCount");
+
+	if (!initializeAngles(_cfg))
+		return false;
+
+	// some checks
+	ASTRA_CONFIG_CHECK(m_iDetectorCount > 0, "ProjectionGeometry2D", "DetectorCount should be positive.");
+
+	// Interface class, so don't return true
+	return false;
+}
+
+bool CProjectionGeometry2D::initializeAngles(const Config& _cfg)
+{
+	ConfigStackCheck<CProjectionGeometry2D> CC("ProjectionGeometry2D", this, _cfg);
+
 	// Required: DetectorWidth
 	XMLNode node = _cfg.self.getSingleNode("DetectorWidth");
 	ASTRA_CONFIG_CHECK(node, "ProjectionGeometry2D", "No DetectorWidth tag specified.");
-	m_fDetectorWidth = node.getContentNumerical();
+	try {
+		m_fDetectorWidth = node.getContentNumerical();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "ProjectionGeometry2D", "DetectorWidth must be numerical.");
+	}
 	CC.markNodeParsed("DetectorWidth");
 
-	// Required: DetectorCount
-	node = _cfg.self.getSingleNode("DetectorCount");
-	ASTRA_CONFIG_CHECK(node, "ProjectionGeometry2D", "No DetectorCount tag specified.");
-	m_iDetectorCount = node.getContentInt();
-	CC.markNodeParsed("DetectorCount");
 
 	// Required: ProjectionAngles
 	node = _cfg.self.getSingleNode("ProjectionAngles");
 	ASTRA_CONFIG_CHECK(node, "ProjectionGeometry2D", "No ProjectionAngles tag specified.");
-	vector<float32> angles = node.getContentNumericalArray();
+	vector<float32> angles;
+	try {
+		angles = node.getContentNumericalArray();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "ProjectionGeometry2D", "ProjectionAngles must be a numerical vector.");
+	}
 	m_iProjectionAngleCount = angles.size();
 	ASTRA_CONFIG_CHECK(m_iProjectionAngleCount > 0, "ProjectionGeometry2D", "Not enough ProjectionAngles specified.");
 	m_pfProjectionAngles = new float32[m_iProjectionAngleCount];
@@ -139,14 +167,10 @@ bool CProjectionGeometry2D::initialize(const Config& _cfg)
 		m_pfProjectionAngles[i] = angles[i];
 	}
 	CC.markNodeParsed("ProjectionAngles");
-
-	// some checks
-	ASTRA_CONFIG_CHECK(m_iDetectorCount > 0, "ProjectionGeometry2D", "DetectorCount should be positive.");
-	ASTRA_CONFIG_CHECK(m_fDetectorWidth > 0.0f, "ProjectionGeometry2D", "DetectorWidth should be positive.");
 	ASTRA_CONFIG_CHECK(m_pfProjectionAngles != NULL, "ProjectionGeometry2D", "ProjectionAngles not initialized");
 
-	// Interface class, so don't return true
-	return false;
+	ASTRA_CONFIG_CHECK(m_fDetectorWidth > 0.0f, "ProjectionGeometry2D", "DetectorWidth should be positive.");
+	return true;
 }
 
 //----------------------------------------------------------------------------------------
diff --git a/src/ProjectionGeometry3D.cpp b/src/ProjectionGeometry3D.cpp
index bea88ab..92de247 100644
--- a/src/ProjectionGeometry3D.cpp
+++ b/src/ProjectionGeometry3D.cpp
@@ -133,7 +133,7 @@ void CProjectionGeometry3D::clear()
 }
 
 //----------------------------------------------------------------------------------------
-// Initialization witha Config object
+// Initialization with a Config object
 bool CProjectionGeometry3D::initialize(const Config& _cfg)
 {
 	ASTRA_ASSERT(_cfg.self);
@@ -145,35 +145,70 @@ bool CProjectionGeometry3D::initialize(const Config& _cfg)
 
 	ASTRA_ASSERT(_cfg.self);
 	
-	// Required: DetectorWidth
-	XMLNode node = _cfg.self.getSingleNode("DetectorSpacingX");
-	ASTRA_CONFIG_CHECK(node, "ProjectionGeometry3D", "No DetectorSpacingX tag specified.");
-	m_fDetectorSpacingX = node.getContentNumerical();
-	CC.markNodeParsed("DetectorSpacingX");
-
-	// Required: DetectorHeight
-	node = _cfg.self.getSingleNode("DetectorSpacingY");
-	ASTRA_CONFIG_CHECK(node, "ProjectionGeometry3D", "No DetectorSpacingY tag specified.");
-	m_fDetectorSpacingY = node.getContentNumerical();
-	CC.markNodeParsed("DetectorSpacingY");
 
 	// Required: DetectorRowCount
-	node = _cfg.self.getSingleNode("DetectorRowCount");
+	XMLNode node = _cfg.self.getSingleNode("DetectorRowCount");
 	ASTRA_CONFIG_CHECK(node, "ProjectionGeometry3D", "No DetectorRowCount tag specified.");
-	m_iDetectorRowCount = node.getContentInt();
+	try {
+		m_iDetectorRowCount = node.getContentInt();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "ProjectionGeometry3D", "DetectorRowCount must be an integer.");
+	}
 	CC.markNodeParsed("DetectorRowCount");
 
 	// Required: DetectorCount
 	node = _cfg.self.getSingleNode("DetectorColCount");
 	ASTRA_CONFIG_CHECK(node, "ProjectionGeometry3D", "No DetectorColCount tag specified.");
-	m_iDetectorColCount = node.getContentInt();
+	try {
+		m_iDetectorColCount = node.getContentInt();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "ProjectionGeometry3D", "DetectorColCount must be an integer.");
+	}
 	m_iDetectorTotCount = m_iDetectorRowCount * m_iDetectorColCount;
 	CC.markNodeParsed("DetectorColCount");
 
+
+	if (!initializeAngles(_cfg))
+		return false;
+
+
+	// Interface class, so don't return true
+	return false;
+}
+
+bool CProjectionGeometry3D::initializeAngles(const Config& _cfg)
+{
+	ConfigStackCheck<CProjectionGeometry3D> CC("ProjectionGeometry3D", this, _cfg);
+
+	// Required: DetectorWidth
+	XMLNode node = _cfg.self.getSingleNode("DetectorSpacingX");
+	ASTRA_CONFIG_CHECK(node, "ProjectionGeometry3D", "No DetectorSpacingX tag specified.");
+	try {
+		m_fDetectorSpacingX = node.getContentNumerical();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "ProjectionGeometry3D", "DetectorSpacingX must be numerical.");
+	}
+	CC.markNodeParsed("DetectorSpacingX");
+
+	// Required: DetectorHeight
+	node = _cfg.self.getSingleNode("DetectorSpacingY");
+	ASTRA_CONFIG_CHECK(node, "ProjectionGeometry3D", "No DetectorSpacingY tag specified.");
+	try {
+		m_fDetectorSpacingY = node.getContentNumerical();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "ProjectionGeometry3D", "DetectorSpacingY must be numerical.");
+	}
+	CC.markNodeParsed("DetectorSpacingY");
+
 	// Required: ProjectionAngles
 	node = _cfg.self.getSingleNode("ProjectionAngles");
 	ASTRA_CONFIG_CHECK(node, "ProjectionGeometry3D", "No ProjectionAngles tag specified.");
-	vector<float32> angles = node.getContentNumericalArray();
+	vector<float32> angles;
+	try {
+		angles = node.getContentNumericalArray();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "ProjectionGeometry3D", "ProjectionAngles must be a numerical vector.");
+	}
 	m_iProjectionAngleCount = angles.size();
 	ASTRA_CONFIG_CHECK(m_iProjectionAngleCount > 0, "ProjectionGeometry3D", "Not enough ProjectionAngles specified.");
 	m_pfProjectionAngles = new float32[m_iProjectionAngleCount];
@@ -182,8 +217,8 @@ bool CProjectionGeometry3D::initialize(const Config& _cfg)
 	}
 	CC.markNodeParsed("ProjectionAngles");
 
-	// Interface class, so don't return true
-	return false;
+
+	return true;
 }
 
 //----------------------------------------------------------------------------------------
diff --git a/src/Utilities.cpp b/src/Utilities.cpp
index 6346a49..dc654ea 100644
--- a/src/Utilities.cpp
+++ b/src/Utilities.cpp
@@ -44,7 +44,17 @@ int stringToInt(const std::string& s)
 	if (iss.fail() || !iss.eof())
 		throw bad_cast();
 	return i;
+}
 
+int stringToInt(const std::string& s, int fallback)
+{
+	int i;
+	std::istringstream iss(s);
+	iss.imbue(std::locale::classic());
+	iss >> i;
+	if (iss.fail() || !iss.eof())
+		return fallback;
+	return i;
 }
 
 float stringToFloat(const std::string& s)
diff --git a/src/VolumeGeometry2D.cpp b/src/VolumeGeometry2D.cpp
index d7a8051..b27caa8 100644
--- a/src/VolumeGeometry2D.cpp
+++ b/src/VolumeGeometry2D.cpp
@@ -164,20 +164,32 @@ bool CVolumeGeometry2D::initialize(const Config& _cfg)
 	// Required: GridColCount
 	XMLNode node = _cfg.self.getSingleNode("GridColCount");
 	ASTRA_CONFIG_CHECK(node, "VolumeGeometry2D", "No GridColCount tag specified.");
-	m_iGridColCount = node.getContentInt();
+	try {
+		m_iGridColCount = node.getContentInt();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "VolumeGeometry2D", "GridColCount must be an integer.");
+	}
 	CC.markNodeParsed("GridColCount");
 
 	// Required: GridRowCount
 	node = _cfg.self.getSingleNode("GridRowCount");
 	ASTRA_CONFIG_CHECK(node, "VolumeGeometry2D", "No GridRowCount tag specified.");
-	m_iGridRowCount = node.getContentInt();
+	try {
+		m_iGridRowCount = node.getContentInt();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "VolumeGeometry2D", "GridRowCount must be an integer.");
+	}
 	CC.markNodeParsed("GridRowCount");
 
 	// Optional: Window minima and maxima
-	m_fWindowMinX = _cfg.self.getOptionNumerical("WindowMinX", -m_iGridColCount/2.0f);
-	m_fWindowMaxX = _cfg.self.getOptionNumerical("WindowMaxX", m_iGridColCount/2.0f);
-	m_fWindowMinY = _cfg.self.getOptionNumerical("WindowMinY", -m_iGridRowCount/2.0f);
-	m_fWindowMaxY = _cfg.self.getOptionNumerical("WindowMaxY", m_iGridRowCount/2.0f);
+	try {
+		m_fWindowMinX = _cfg.self.getOptionNumerical("WindowMinX", -m_iGridColCount/2.0f);
+		m_fWindowMaxX = _cfg.self.getOptionNumerical("WindowMaxX", m_iGridColCount/2.0f);
+		m_fWindowMinY = _cfg.self.getOptionNumerical("WindowMinY", -m_iGridRowCount/2.0f);
+		m_fWindowMaxY = _cfg.self.getOptionNumerical("WindowMaxY", m_iGridRowCount/2.0f);
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "VolumeGeometry2D", "Window extents must be numerical.");
+	}
 	CC.markOptionParsed("WindowMinX");
 	CC.markOptionParsed("WindowMaxX");
 	CC.markOptionParsed("WindowMinY");
diff --git a/src/VolumeGeometry3D.cpp b/src/VolumeGeometry3D.cpp
index b8c2409..eb8cc60 100644
--- a/src/VolumeGeometry3D.cpp
+++ b/src/VolumeGeometry3D.cpp
@@ -193,28 +193,44 @@ bool CVolumeGeometry3D::initialize(const Config& _cfg)
 	// Required: GridColCount
 	XMLNode node = _cfg.self.getSingleNode("GridColCount");
 	ASTRA_CONFIG_CHECK(node, "VolumeGeometry3D", "No GridColCount tag specified.");
-	m_iGridColCount = node.getContentInt();
+	try {
+		m_iGridColCount = node.getContentInt();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "VolumeGeometry3D", "GridColCount must be an integer.");
+	}
 	CC.markNodeParsed("GridColCount");
 
 	// Required: GridRowCount
 	node = _cfg.self.getSingleNode("GridRowCount");
 	ASTRA_CONFIG_CHECK(node, "VolumeGeometry3D", "No GridRowCount tag specified.");
-	m_iGridRowCount = node.getContentInt();
+	try {
+		m_iGridRowCount = node.getContentInt();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "VolumeGeometry3D", "GridRowCount must be an integer.");
+	}
 	CC.markNodeParsed("GridRowCount");
 
 	// Required: GridRowCount
 	node = _cfg.self.getSingleNode("GridSliceCount");
 	ASTRA_CONFIG_CHECK(node, "VolumeGeometry3D", "No GridSliceCount tag specified.");
-	m_iGridSliceCount = node.getContentInt();
+	try {
+		m_iGridSliceCount = node.getContentInt();
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "VolumeGeometry3D", "GridSliceCount must be an integer.");
+	}
 	CC.markNodeParsed("GridSliceCount");
 
 	// Optional: Window minima and maxima
-	m_fWindowMinX = _cfg.self.getOptionNumerical("WindowMinX", -m_iGridColCount/2.0f);
-	m_fWindowMaxX = _cfg.self.getOptionNumerical("WindowMaxX", m_iGridColCount/2.0f);
-	m_fWindowMinY = _cfg.self.getOptionNumerical("WindowMinY", -m_iGridRowCount/2.0f);
-	m_fWindowMaxY = _cfg.self.getOptionNumerical("WindowMaxY", m_iGridRowCount/2.0f);
-	m_fWindowMinZ = _cfg.self.getOptionNumerical("WindowMinZ", -m_iGridSliceCount/2.0f);
-	m_fWindowMaxZ = _cfg.self.getOptionNumerical("WindowMaxZ", m_iGridSliceCount/2.0f);
+	try {
+		m_fWindowMinX = _cfg.self.getOptionNumerical("WindowMinX", -m_iGridColCount/2.0f);
+		m_fWindowMaxX = _cfg.self.getOptionNumerical("WindowMaxX", m_iGridColCount/2.0f);
+		m_fWindowMinY = _cfg.self.getOptionNumerical("WindowMinY", -m_iGridRowCount/2.0f);
+		m_fWindowMaxY = _cfg.self.getOptionNumerical("WindowMaxY", m_iGridRowCount/2.0f);
+		m_fWindowMinZ = _cfg.self.getOptionNumerical("WindowMinZ", -m_iGridSliceCount/2.0f);
+		m_fWindowMaxZ = _cfg.self.getOptionNumerical("WindowMaxZ", m_iGridSliceCount/2.0f);
+	} catch (const StringUtil::bad_cast &e) {
+		ASTRA_CONFIG_CHECK(false, "VolumeGeometry3D", "Window extents must be numerical.");
+	}
 	CC.markOptionParsed("WindowMinX");
 	CC.markOptionParsed("WindowMaxX");
 	CC.markOptionParsed("WindowMinY");