diff --git a/include/Nazara/Renderer/ShaderAst.hpp b/include/Nazara/Renderer/ShaderAst.hpp
index 28b808d6c..08e8e20b2 100644
--- a/include/Nazara/Renderer/ShaderAst.hpp
+++ b/include/Nazara/Renderer/ShaderAst.hpp
@@ -258,6 +258,7 @@ namespace Nz
 		{
 			public:
 				inline Cast(ExpressionType castTo, ExpressionPtr first, ExpressionPtr second = nullptr, ExpressionPtr third = nullptr, ExpressionPtr fourth = nullptr);
+				inline Cast(ExpressionType castTo, ExpressionPtr* expressions, std::size_t expressionCount);
 
 				ExpressionType GetExpressionType() const override;
 				void Register(ShaderWriter& visitor) override;
@@ -265,6 +266,9 @@ namespace Nz
 
 				ExpressionType exprType;
 				std::array<ExpressionPtr, 4> expressions;
+
+			private:
+				void Validate() const;
 		};
 
 		class NAZARA_RENDERER_API Constant : public Expression
diff --git a/include/Nazara/Renderer/ShaderAst.inl b/include/Nazara/Renderer/ShaderAst.inl
index ea9e5cddf..e837cbdb4 100644
--- a/include/Nazara/Renderer/ShaderAst.inl
+++ b/include/Nazara/Renderer/ShaderAst.inl
@@ -169,19 +169,16 @@ namespace Nz
 		exprType(castTo),
 		expressions({ {first, second, third, fourth} })
 		{
-			unsigned int componentCount = 0;
-			unsigned int requiredComponents = GetComponentCount(exprType);
-			for (const auto& exprPtr : expressions)
-			{
-				if (!exprPtr)
-					break;
+			Validate();
+		}
 
-				componentCount += GetComponentCount(exprPtr->GetExpressionType());
-			}
+		inline Cast::Cast(ExpressionType castTo, ExpressionPtr* Expressions, std::size_t expressionCount) :
+		exprType(castTo)
+		{
+			for (std::size_t i = 0; i < expressionCount; ++i)
+				expressions[i] = Expressions[i];
 
-			//TODO: AstParseError
-			if (componentCount != requiredComponents)
-				throw std::runtime_error("Component count doesn't match required component count");
+			Validate();
 		}
 
 		inline Constant::Constant(bool value) :
diff --git a/src/Nazara/Renderer/ShaderAst.cpp b/src/Nazara/Renderer/ShaderAst.cpp
index 0899cbdc7..a0a0cc031 100644
--- a/src/Nazara/Renderer/ShaderAst.cpp
+++ b/src/Nazara/Renderer/ShaderAst.cpp
@@ -200,6 +200,23 @@ namespace Nz::ShaderAst
 		visitor.Write(*this);
 	}
 
+	void Cast::Validate() const
+	{
+		unsigned int componentCount = 0;
+		unsigned int requiredComponents = GetComponentCount(exprType);
+		for (const auto& exprPtr : expressions)
+		{
+			if (!exprPtr)
+				break;
+
+			componentCount += GetComponentCount(exprPtr->GetExpressionType());
+		}
+
+		//TODO: AstParseError
+		if (componentCount != requiredComponents)
+			throw std::runtime_error("Component count doesn't match required component count");
+	}
+
 
 	ExpressionCategory SwizzleOp::GetExpressionCategory() const
 	{
diff --git a/src/ShaderNode/DataModels/Cast.hpp b/src/ShaderNode/DataModels/Cast.hpp
index c1b63e8e0..90dad931e 100644
--- a/src/ShaderNode/DataModels/Cast.hpp
+++ b/src/ShaderNode/DataModels/Cast.hpp
@@ -10,7 +10,7 @@
 #include <ShaderNode/DataModels/ShaderNode.hpp>
 #include <ShaderNode/DataTypes/VecData.hpp>
 
-template<typename From, typename To>
+template<std::size_t ToComponentCount>
 class CastVec : public ShaderNode
 {
 	public:
@@ -31,25 +31,21 @@ class CastVec : public ShaderNode
 
 		void setInData(std::shared_ptr<QtNodes::NodeData> value, int index) override;
 
-	private:
-		static constexpr std::size_t FromComponents = From::ComponentCount;
-		static constexpr std::size_t ToComponents = To::ComponentCount;
-		static constexpr std::size_t ComponentDiff = (ToComponents >= FromComponents) ? ToComponents - FromComponents : 0;
+		QtNodes::NodeValidationState validationState() const override;
+		QString validationMessage() const override;
 
+	private:
 		bool ComputePreview(QPixmap& pixmap) override;
 		void UpdateOutput();
 
-		VecType<ComponentDiff> m_overflowComponents;
-		std::shared_ptr<From> m_input;
-		std::shared_ptr<To> m_output;
+		std::shared_ptr<VecData> m_input;
+		std::shared_ptr<VecData> m_output;
+		VecType<ToComponentCount> m_overflowComponents;
 };
 
-using CastVec2ToVec3 = CastVec<Vec2Data, Vec3Data>;
-using CastVec2ToVec4 = CastVec<Vec2Data, Vec4Data>;
-using CastVec3ToVec2 = CastVec<Vec3Data, Vec2Data>;
-using CastVec3ToVec4 = CastVec<Vec3Data, Vec4Data>;
-using CastVec4ToVec2 = CastVec<Vec4Data, Vec2Data>;
-using CastVec4ToVec3 = CastVec<Vec4Data, Vec3Data>;
+using CastToVec2 = CastVec<2>;
+using CastToVec3 = CastVec<3>;
+using CastToVec4 = CastVec<4>;
 
 #include <ShaderNode/DataModels/Cast.inl>
 
diff --git a/src/ShaderNode/DataModels/Cast.inl b/src/ShaderNode/DataModels/Cast.inl
index 56866aa3e..64ed934a2 100644
--- a/src/ShaderNode/DataModels/Cast.inl
+++ b/src/ShaderNode/DataModels/Cast.inl
@@ -4,21 +4,32 @@
 #include <QtWidgets/QFormLayout>
 #include <stdexcept>
 
-template<typename From, typename To>
-CastVec<From, To>::CastVec(ShaderGraph& graph) :
+template<std::size_t ToComponentCount>
+CastVec<ToComponentCount>::CastVec(ShaderGraph& graph) :
 ShaderNode(graph)
 {
-	static_assert(ComponentDiff <= s_vectorComponents.size());
+	static_assert(ToComponentCount <= s_vectorComponents.size());
+
+	m_overflowComponents.fill(0.f);
+
+	m_output = std::make_shared<VecData>(ToComponentCount);
 }
 
-template<typename From, typename To>
-void CastVec<From, To>::BuildNodeEdition(QFormLayout* layout)
+template<std::size_t ToComponentCount>
+void CastVec<ToComponentCount>::BuildNodeEdition(QFormLayout* layout)
 {
 	ShaderNode::BuildNodeEdition(layout);
 
-	if constexpr (ComponentDiff > 0)
+	if (!m_input)
+		return;
+
+	std::size_t fromComponentCount = m_input->componentCount;
+
+	if (ToComponentCount > fromComponentCount)
 	{
-		for (std::size_t i = 0; i < ComponentDiff; ++i)
+		std::size_t overflowComponentCount = ToComponentCount - fromComponentCount;
+
+		for (std::size_t i = 0; i < overflowComponentCount; ++i)
 		{
 			QDoubleSpinBox* spinbox = new QDoubleSpinBox;
 			spinbox->setDecimals(6);
@@ -30,31 +41,36 @@ void CastVec<From, To>::BuildNodeEdition(QFormLayout* layout)
 				UpdateOutput();
 			});
 
-			layout->addRow(QString::fromUtf8(&s_vectorComponents[FromComponents + i], 1), spinbox);
+			layout->addRow(QString::fromUtf8(&s_vectorComponents[fromComponentCount + i], 1), spinbox);
 		}
 	}
 }
 
-template<typename From, typename To>
-Nz::ShaderAst::ExpressionPtr CastVec<From, To>::GetExpression(Nz::ShaderAst::ExpressionPtr* expressions, std::size_t count) const
+template<std::size_t ToComponentCount>
+Nz::ShaderAst::ExpressionPtr CastVec<ToComponentCount>::GetExpression(Nz::ShaderAst::ExpressionPtr* expressions, std::size_t count) const
 {
+	assert(m_input);
 	assert(count == 1);
 
-	if constexpr (ComponentDiff > 0)
-	{
-		std::array<Nz::ShaderAst::ExpressionPtr, ComponentDiff> constants;
-		for (std::size_t i = 0; i < ComponentDiff; ++i)
-			constants[i] = Nz::ShaderBuilder::Constant(m_overflowComponents[i]);
+	std::size_t fromComponentCount = m_input->componentCount;
 
-		return std::apply([&](auto&&... values)
-		{
-			return Nz::ShaderBuilder::Cast<To::ExpressionType>(expressions[0], values...); //< TODO: Forward
-		}, constants);
-	}
-	else
+	if (ToComponentCount > fromComponentCount)
 	{
-		std::array<Nz::ShaderAst::SwizzleComponent, ToComponents> swizzleComponents;
-		for (std::size_t i = 0; i < ToComponents; ++i)
+		std::size_t overflowComponentCount = ToComponentCount - fromComponentCount;
+
+		std::array<Nz::ShaderAst::ExpressionPtr, 4> expr;
+		expr[0] = expressions[0];
+		for (std::size_t i = 0; i < overflowComponentCount; ++i)
+			expr[i + 1] = Nz::ShaderBuilder::Constant(m_overflowComponents[i]);
+
+		constexpr auto ExpressionType = VecExpressionType<ToComponentCount>;
+
+		return Nz::ShaderBuilder::Cast<ExpressionType>(expr.data(), overflowComponentCount);
+	}
+	else if (ToComponentCount < fromComponentCount)
+	{
+		std::array<Nz::ShaderAst::SwizzleComponent, ToComponentCount> swizzleComponents;
+		for (std::size_t i = 0; i < ToComponentCount; ++i)
 			swizzleComponents[i] = static_cast<Nz::ShaderAst::SwizzleComponent>(static_cast<std::size_t>(Nz::ShaderAst::SwizzleComponent::First) + i);
 
 		return std::apply([&](auto... components)
@@ -63,39 +79,41 @@ Nz::ShaderAst::ExpressionPtr CastVec<From, To>::GetExpression(Nz::ShaderAst::Exp
 			return Nz::ShaderBuilder::Swizzle(expressions[0], componentList);
 		}, swizzleComponents);
 	}
+	else
+		return expressions[0]; //< no-op
 }
 
-template<typename From, typename To>
-QString CastVec<From, To>::caption() const
+template<std::size_t ToComponentCount>
+QString CastVec<ToComponentCount>::caption() const
 {
-	static QString caption = From::Type().name + " to " + To::Type().name;
+	static QString caption = "To Vector" + QString::number(ToComponentCount);
 	return caption;
 }
 
-template<typename From, typename To>
-QString CastVec<From, To>::name() const
+template<std::size_t ToComponentCount>
+QString CastVec<ToComponentCount>::name() const
 {
-	static QString name = From::Type().id + "to" + To::Type().id;
+	static QString name = "cast_vec" + QString::number(ToComponentCount);
 	return name;
 }
 
-template<typename From, typename To>
-QtNodes::NodeDataType CastVec<From, To>::dataType(QtNodes::PortType portType, QtNodes::PortIndex portIndex) const
+template<std::size_t ToComponentCount>
+QtNodes::NodeDataType CastVec<ToComponentCount>::dataType(QtNodes::PortType portType, QtNodes::PortIndex portIndex) const
 {
 	assert(portIndex == 0);
 
 	switch (portType)
 	{
-		case QtNodes::PortType::In:  return From::Type();
-		case QtNodes::PortType::Out: return To::Type();
+		case QtNodes::PortType::In:  return VecData::Type();
+		case QtNodes::PortType::Out: return VecData::Type();
 	}
 
 	assert(false);
 	throw std::runtime_error("Invalid port type");
 }
 
-template<typename From, typename To>
-unsigned int CastVec<From, To>::nPorts(QtNodes::PortType portType) const
+template<std::size_t ToComponentCount>
+unsigned int CastVec<ToComponentCount>::nPorts(QtNodes::PortType portType) const
 {
 	switch (portType)
 	{
@@ -106,8 +124,8 @@ unsigned int CastVec<From, To>::nPorts(QtNodes::PortType portType) const
 	return 0;
 }
 
-template<typename From, typename To>
-std::shared_ptr<QtNodes::NodeData> CastVec<From, To>::outData(QtNodes::PortIndex port)
+template<std::size_t ToComponentCount>
+std::shared_ptr<QtNodes::NodeData> CastVec<ToComponentCount>::outData(QtNodes::PortIndex port)
 {
 	assert(port == 0);
 
@@ -117,14 +135,14 @@ std::shared_ptr<QtNodes::NodeData> CastVec<From, To>::outData(QtNodes::PortIndex
 	return m_output;
 }
 
-template<typename From, typename To>
-void CastVec<From, To>::setInData(std::shared_ptr<QtNodes::NodeData> value, int index)
+template<std::size_t ToComponentCount>
+void CastVec<ToComponentCount>::setInData(std::shared_ptr<QtNodes::NodeData> value, int index)
 {
 	assert(index == 0);
 	if (value)
 	{
-		assert(dynamic_cast<From*>(value.get()) != nullptr);
-		m_input = std::static_pointer_cast<From>(value);
+		assert(dynamic_cast<VecData*>(value.get()) != nullptr);
+		m_input = std::static_pointer_cast<VecData>(value);
 	}
 	else
 		m_input.reset();
@@ -132,8 +150,26 @@ void CastVec<From, To>::setInData(std::shared_ptr<QtNodes::NodeData> value, int
 	UpdateOutput();
 }
 
-template<typename From, typename To>
-bool CastVec<From, To>::ComputePreview(QPixmap& pixmap)
+template<std::size_t ToComponentCount>
+QtNodes::NodeValidationState CastVec<ToComponentCount>::validationState() const
+{
+	if (!m_input)
+		return QtNodes::NodeValidationState::Error;
+
+	return QtNodes::NodeValidationState::Valid;
+}
+
+template<std::size_t ToComponentCount>
+QString CastVec<ToComponentCount>::validationMessage() const
+{
+	if (!m_input)
+		return "Missing input";
+
+	return QString();
+}
+
+template<std::size_t ToComponentCount>
+bool CastVec<ToComponentCount>::ComputePreview(QPixmap& pixmap)
 {
 	if (!m_input)
 		return false;
@@ -142,8 +178,8 @@ bool CastVec<From, To>::ComputePreview(QPixmap& pixmap)
 	return true;
 }
 
-template<typename From, typename To>
-void CastVec<From, To>::UpdateOutput()
+template<std::size_t ToComponentCount>
+void CastVec<ToComponentCount>::UpdateOutput()
 {
 	if (!m_input)
 	{
@@ -160,10 +196,15 @@ void CastVec<From, To>::UpdateOutput()
 	QImage& output = m_output->preview;
 	output = QImage(inputWidth, inputHeight, QImage::Format_RGBA8888);
 
-	std::array<std::uint8_t, ComponentDiff> constants;
-	if constexpr (ComponentDiff > 0)
+	std::size_t fromComponentCount = m_input->componentCount;
+	std::size_t commonComponents = std::min(fromComponentCount, ToComponentCount);
+	std::size_t overflowComponentCount = (ToComponentCount > fromComponentCount) ? ToComponentCount - fromComponentCount : 0;
+	std::size_t voidComponents = 4 - overflowComponentCount - commonComponents;
+
+	std::array<std::uint8_t, 4> constants;
+	if (ToComponentCount > fromComponentCount)
 	{
-		for (std::size_t i = 0; i < ComponentDiff; ++i)
+		for (std::size_t i = 0; i < overflowComponentCount; ++i)
 			constants[i] = static_cast<std::uint8_t>(std::clamp(int(m_overflowComponents[i] * 255), 0, 255));
 	}
 
@@ -173,17 +214,14 @@ void CastVec<From, To>::UpdateOutput()
 	{
 		for (int x = 0; x < inputWidth; ++x)
 		{
-			constexpr std::size_t CommonComponents = std::min(FromComponents, ToComponents);
-			constexpr std::size_t VoidComponents = 4 - ComponentDiff - CommonComponents;
-
-			for (std::size_t i = 0; i < CommonComponents; ++i)
+			for (std::size_t i = 0; i < commonComponents; ++i)
 				*outputPtr++ = inputPtr[i];
 
-			for (std::size_t i = 0; i < ComponentDiff; ++i)
+			for (std::size_t i = 0; i < overflowComponentCount; ++i)
 				*outputPtr++ = constants[i];
 
-			for (std::size_t i = 0; i < VoidComponents; ++i)
-				*outputPtr++ = (i == VoidComponents - 1) ? 255 : 0;
+			for (std::size_t i = 0; i < voidComponents; ++i)
+				*outputPtr++ = (i == voidComponents - 1) ? 255 : 0;
 
 			inputPtr += 4;
 		}
diff --git a/src/ShaderNode/DataModels/InputValue.cpp b/src/ShaderNode/DataModels/InputValue.cpp
index 9ff7fd207..6defcb30f 100644
--- a/src/ShaderNode/DataModels/InputValue.cpp
+++ b/src/ShaderNode/DataModels/InputValue.cpp
@@ -121,16 +121,17 @@ auto InputValue::dataType(QtNodes::PortType portType, QtNodes::PortIndex portInd
 	assert(portIndex == 0);
 
 	if (!m_currentInputIndex)
-		return Vec4Data::Type();
+		return VecData::Type();
 
 	const auto& inputEntry = GetGraph().GetInput(*m_currentInputIndex);
 	switch (inputEntry.type)
 	{
 		//case InputType::Bool:   return Nz::ShaderAst::ExpressionType::Boolean;
 		//case InputType::Float1: return Nz::ShaderAst::ExpressionType::Float1;
-		case InOutType::Float2: return Vec2Data::Type();
-		case InOutType::Float3: return Vec3Data::Type();
-		case InOutType::Float4: return Vec4Data::Type();
+		case InOutType::Float2:
+		case InOutType::Float3:
+		case InOutType::Float4:
+			return VecData::Type();
 	}
 
 	assert(false);
@@ -148,8 +149,24 @@ std::shared_ptr<QtNodes::NodeData> InputValue::outData(QtNodes::PortIndex port)
 	const auto& inputEntry = graph.GetInput(*m_currentInputIndex);
 	const auto& preview = graph.GetPreviewModel();
 
-	auto vecData = std::make_shared<Vec2Data>();
+	auto vecData = std::make_shared<VecData>(GetComponentCount(inputEntry.type));
 	vecData->preview = preview.GetImage(inputEntry.role, inputEntry.roleIndex);
 
 	return vecData;
 }
+
+QtNodes::NodeValidationState InputValue::validationState() const
+{
+	if (!m_currentInputIndex)
+		return QtNodes::NodeValidationState::Error;
+
+	return QtNodes::NodeValidationState::Valid;
+}
+
+QString InputValue::validationMessage() const
+{
+	if (!m_currentInputIndex)
+		return "No input selected";
+
+	return QString();
+}
diff --git a/src/ShaderNode/DataModels/InputValue.hpp b/src/ShaderNode/DataModels/InputValue.hpp
index 0170221f5..4b4c1b31c 100644
--- a/src/ShaderNode/DataModels/InputValue.hpp
+++ b/src/ShaderNode/DataModels/InputValue.hpp
@@ -30,6 +30,9 @@ class InputValue : public ShaderNode
 
 		std::shared_ptr<QtNodes::NodeData> outData(QtNodes::PortIndex port) override;
 
+		QtNodes::NodeValidationState validationState() const override;
+		QString validationMessage() const override;
+
 	private:
 		bool ComputePreview(QPixmap& pixmap) override;
 		void OnInputListUpdate();
diff --git a/src/ShaderNode/DataModels/OutputValue.cpp b/src/ShaderNode/DataModels/OutputValue.cpp
index 2d3a8dc14..04eeafd48 100644
--- a/src/ShaderNode/DataModels/OutputValue.cpp
+++ b/src/ShaderNode/DataModels/OutputValue.cpp
@@ -87,16 +87,17 @@ QtNodes::NodeDataType OutputValue::dataType(QtNodes::PortType portType, QtNodes:
 	assert(portIndex == 0);
 
 	if (!m_currentOutputIndex)
-		return Vec4Data::Type();
+		return VecData::Type();
 
 	const auto& outputEntry = GetGraph().GetOutput(*m_currentOutputIndex);
 	switch (outputEntry.type)
 	{
 		//case InOutType::Bool:   return Nz::ShaderAst::ExpressionType::Boolean;
 		//case InOutType::Float1: return Nz::ShaderAst::ExpressionType::Float1;
-		case InOutType::Float2: return Vec2Data::Type();
-		case InOutType::Float3: return Vec3Data::Type();
-		case InOutType::Float4: return Vec4Data::Type();
+		case InOutType::Float2:
+		case InOutType::Float3:
+		case InOutType::Float4:
+			return VecData::Type();
 	}
 
 	assert(false);
@@ -124,8 +125,8 @@ void OutputValue::setInData(std::shared_ptr<QtNodes::NodeData> value, int index)
 	assert(index == 0);
 	if (value)
 	{
-		assert(dynamic_cast<Vec4Data*>(value.get()) != nullptr);
-		m_input = std::static_pointer_cast<Vec4Data>(value);
+		assert(dynamic_cast<VecData*>(value.get()) != nullptr);
+		m_input = std::static_pointer_cast<VecData>(value);
 	}
 	else
 		m_input.reset();
@@ -133,6 +134,35 @@ void OutputValue::setInData(std::shared_ptr<QtNodes::NodeData> value, int index)
 	UpdatePreview();
 }
 
+QtNodes::NodeValidationState OutputValue::validationState() const
+{
+	if (!m_currentOutputIndex || !m_input)
+		return QtNodes::NodeValidationState::Error;
+
+	const auto& outputEntry = GetGraph().GetOutput(*m_currentOutputIndex);
+	if (GetComponentCount(outputEntry.type) != m_input->componentCount)
+		return QtNodes::NodeValidationState::Error;
+
+	return QtNodes::NodeValidationState::Valid;
+}
+
+QString OutputValue::validationMessage() const
+{
+	if (!m_currentOutputIndex)
+		return "No output selected";
+
+	if (!m_input)
+		return "Missing input";
+
+	const auto& outputEntry = GetGraph().GetOutput(*m_currentOutputIndex);
+	std::size_t outputComponentCount = GetComponentCount(outputEntry.type);
+
+	if (m_input->componentCount != outputComponentCount)
+		return "Incompatible component count (expected " + QString::number(outputComponentCount) + ", got " + QString::number(m_input->componentCount) + ")";
+
+	return QString();
+}
+
 bool OutputValue::ComputePreview(QPixmap& pixmap)
 {
 	if (!m_input)
diff --git a/src/ShaderNode/DataModels/OutputValue.hpp b/src/ShaderNode/DataModels/OutputValue.hpp
index 8db611056..1e7055da5 100644
--- a/src/ShaderNode/DataModels/OutputValue.hpp
+++ b/src/ShaderNode/DataModels/OutputValue.hpp
@@ -29,6 +29,9 @@ class OutputValue : public ShaderNode
 
 		void setInData(std::shared_ptr<QtNodes::NodeData> value, int index) override;
 
+		QtNodes::NodeValidationState validationState() const override;
+		QString validationMessage() const override;
+
 	private:
 		bool ComputePreview(QPixmap& pixmap) override;
 		void OnOutputListUpdate();
diff --git a/src/ShaderNode/DataModels/SampleTexture.cpp b/src/ShaderNode/DataModels/SampleTexture.cpp
index e0fa852c3..970e8a965 100644
--- a/src/ShaderNode/DataModels/SampleTexture.cpp
+++ b/src/ShaderNode/DataModels/SampleTexture.cpp
@@ -5,7 +5,7 @@
 SampleTexture::SampleTexture(ShaderGraph& graph) :
 ShaderNode(graph)
 {
-	m_output = std::make_shared<Vec4Data>();
+	m_output = std::make_shared<VecData>(4);
 
 	UpdateOutput();
 }
@@ -82,9 +82,8 @@ bool SampleTexture::ComputePreview(QPixmap& pixmap)
 
 Nz::ShaderAst::ExpressionPtr SampleTexture::GetExpression(Nz::ShaderAst::ExpressionPtr* expressions, std::size_t count) const
 {
-	if (!m_texture || !m_uv)
-		throw std::runtime_error("invalid inputs");
-
+	assert(m_texture);
+	assert(m_uv);
 	assert(count == 2);
 
 	return Nz::ShaderBuilder::Sample2D(expressions[0], expressions[1]);
@@ -99,7 +98,7 @@ auto SampleTexture::dataType(QtNodes::PortType portType, QtNodes::PortIndex port
 			switch (portIndex)
 			{
 				case 0: return Texture2Data::Type();
-				case 1: return Vec2Data::Type();
+				case 1: return VecData::Type();
 			}
 
 			assert(false);
@@ -109,7 +108,7 @@ auto SampleTexture::dataType(QtNodes::PortType portType, QtNodes::PortIndex port
 		case QtNodes::PortType::Out:
 		{
 			assert(portIndex == 0);
-			return Vec4Data::Type();
+			return VecData::Type();
 		}
 
 		default:
@@ -180,9 +179,9 @@ void SampleTexture::setInData(std::shared_ptr<QtNodes::NodeData> value, int inde
 		{
 			if (value)
 			{
-				assert(dynamic_cast<Vec2Data*>(value.get()) != nullptr);
+				assert(dynamic_cast<VecData*>(value.get()) != nullptr);
 
-				m_uv = std::static_pointer_cast<Vec2Data>(value);
+				m_uv = std::static_pointer_cast<VecData>(value);
 			}
 			else
 				m_uv.reset();
@@ -197,3 +196,28 @@ void SampleTexture::setInData(std::shared_ptr<QtNodes::NodeData> value, int inde
 
 	UpdateOutput();
 }
+
+QtNodes::NodeValidationState SampleTexture::validationState() const
+{
+	if (!m_texture || !m_uv)
+		return QtNodes::NodeValidationState::Error;
+
+	if (m_uv->componentCount != 2)
+		return QtNodes::NodeValidationState::Error;
+
+	return QtNodes::NodeValidationState::Valid;
+}
+
+QString SampleTexture::validationMessage() const
+{
+	if (!m_texture)
+		return "Missing texture";
+
+	if (!m_uv)
+		return "Missing uv";
+
+	if (m_uv->componentCount != 2)
+		return "Incompatible UV (expected 2, got " + QString::number(m_uv->componentCount) + ")";
+
+	return QString();
+}
diff --git a/src/ShaderNode/DataModels/SampleTexture.hpp b/src/ShaderNode/DataModels/SampleTexture.hpp
index 7a24409d0..7afb77e0f 100644
--- a/src/ShaderNode/DataModels/SampleTexture.hpp
+++ b/src/ShaderNode/DataModels/SampleTexture.hpp
@@ -34,13 +34,16 @@ class SampleTexture : public ShaderNode
 
 		void setInData(std::shared_ptr<QtNodes::NodeData> value, int index) override;
 
+		QtNodes::NodeValidationState validationState() const override;
+		QString validationMessage() const override;
+
 	protected:
 		bool ComputePreview(QPixmap& pixmap) override;
 		void UpdateOutput();
 
 		std::shared_ptr<Texture2Data> m_texture;
-		std::shared_ptr<Vec2Data> m_uv;
-		std::shared_ptr<Vec4Data> m_output;
+		std::shared_ptr<VecData> m_uv;
+		std::shared_ptr<VecData> m_output;
 };
 
 #include <ShaderNode/DataModels/SampleTexture.inl>
diff --git a/src/ShaderNode/DataModels/TextureValue.cpp b/src/ShaderNode/DataModels/TextureValue.cpp
index 976ec7dd7..f78a610a9 100644
--- a/src/ShaderNode/DataModels/TextureValue.cpp
+++ b/src/ShaderNode/DataModels/TextureValue.cpp
@@ -92,7 +92,7 @@ void TextureValue::BuildNodeEdition(QFormLayout* layout)
 Nz::ShaderAst::ExpressionPtr TextureValue::GetExpression(Nz::ShaderAst::ExpressionPtr* /*expressions*/, std::size_t count) const
 {
 	if (!m_currentTextureIndex)
-		throw std::runtime_error("invalid inputs");
+		throw std::runtime_error("invalid texture input");
 
 	assert(count == 0);
 
@@ -117,7 +117,7 @@ auto TextureValue::dataType(QtNodes::PortType portType, QtNodes::PortIndex portI
 	assert(portType == QtNodes::PortType::Out);
 	assert(portIndex == 0);
 
-	return Vec4Data::Type();
+	return VecData::Type();
 }
 
 std::shared_ptr<QtNodes::NodeData> TextureValue::outData(QtNodes::PortIndex port)
@@ -145,3 +145,19 @@ std::shared_ptr<QtNodes::NodeData> TextureValue::outData(QtNodes::PortIndex port
 
 	return textureData;
 }
+
+QtNodes::NodeValidationState TextureValue::validationState() const
+{
+	if (!m_currentTextureIndex)
+		return QtNodes::NodeValidationState::Error;
+
+	return QtNodes::NodeValidationState::Valid;
+}
+
+QString TextureValue::validationMessage() const
+{
+	if (!m_currentTextureIndex)
+		return "No texture selected";
+
+	return QString();
+}
diff --git a/src/ShaderNode/DataModels/TextureValue.hpp b/src/ShaderNode/DataModels/TextureValue.hpp
index 27ae9474a..fdf355828 100644
--- a/src/ShaderNode/DataModels/TextureValue.hpp
+++ b/src/ShaderNode/DataModels/TextureValue.hpp
@@ -29,6 +29,9 @@ class TextureValue : public ShaderNode
 
 		std::shared_ptr<QtNodes::NodeData> outData(QtNodes::PortIndex port) override;
 
+		QtNodes::NodeValidationState validationState() const override;
+		QString validationMessage() const override;
+
 	protected:
 		bool ComputePreview(QPixmap& pixmap) override;
 		void OnTextureListUpdate();
diff --git a/src/ShaderNode/DataModels/VecBinOp.cpp b/src/ShaderNode/DataModels/VecBinOp.cpp
index fd2e0d5c1..8f63c2642 100644
--- a/src/ShaderNode/DataModels/VecBinOp.cpp
+++ b/src/ShaderNode/DataModels/VecBinOp.cpp
@@ -1 +1,73 @@
 #include <ShaderNode/DataModels/VecBinOp.hpp>
+
+QString VecAdd::caption() const
+{
+	static QString caption = "Vector addition";
+	return caption;
+}
+
+QString VecAdd::name() const
+{
+	static QString name = "vec_add";
+	return name;
+}
+
+void VecAdd::ApplyOp(const std::uint8_t* left, const std::uint8_t* right, std::uint8_t* output, std::size_t pixelCount)
+{
+	for (std::size_t i = 0; i < pixelCount; ++i)
+	{
+		unsigned int lValue = left[i];
+		unsigned int rValue = right[i];
+
+		output[i] = static_cast<std::uint8_t>(std::min(lValue + rValue, 255U));
+	}
+}
+
+QString VecMul::caption() const
+{
+	static QString caption = "Vector multiplication";
+	return caption;
+}
+
+QString VecMul::name() const
+{
+	static QString name = "vec_mul";
+	return name;
+}
+
+void VecMul::ApplyOp(const std::uint8_t* left, const std::uint8_t* right, std::uint8_t* output, std::size_t pixelCount)
+{
+	for (std::size_t i = 0; i < pixelCount; ++i)
+	{
+		unsigned int lValue = left[i];
+		unsigned int rValue = right[i];
+
+		output[i] = static_cast<std::uint8_t>(lValue * rValue / 255);
+	}
+}
+
+QString VecSub::caption() const
+{
+	static QString caption = "Vector subtraction";
+	return caption;
+}
+
+
+QString VecSub::name() const
+{
+	static QString name = "vec_sub";
+	return name;
+}
+
+void VecSub::ApplyOp(const std::uint8_t* left, const std::uint8_t* right, std::uint8_t* output, std::size_t pixelCount)
+{
+	for (std::size_t i = 0; i < pixelCount; ++i)
+	{
+		unsigned int lValue = left[i];
+		unsigned int rValue = right[i];
+
+		unsigned int sub = (lValue >= rValue) ? lValue - rValue : 0u;
+
+		output[i] = static_cast<std::uint8_t>(sub);
+	}
+}
diff --git a/src/ShaderNode/DataModels/VecBinOp.hpp b/src/ShaderNode/DataModels/VecBinOp.hpp
index 6fa8fe875..f8bebc667 100644
--- a/src/ShaderNode/DataModels/VecBinOp.hpp
+++ b/src/ShaderNode/DataModels/VecBinOp.hpp
@@ -6,7 +6,7 @@
 #include <ShaderNode/DataModels/ShaderNode.hpp>
 #include <ShaderNode/DataTypes/VecData.hpp>
 
-template<typename Data, Nz::ShaderAst::BinaryType BinOp>
+template<Nz::ShaderAst::BinaryType BinOp>
 class VecBinOp : public ShaderNode
 {
 	public:
@@ -29,16 +29,15 @@ class VecBinOp : public ShaderNode
 		bool ComputePreview(QPixmap& pixmap) override;
 		void UpdateOutput();
 
-		std::shared_ptr<Data> m_lhs;
-		std::shared_ptr<Data> m_rhs;
-		std::shared_ptr<Data> m_output;
+		std::shared_ptr<VecData> m_lhs;
+		std::shared_ptr<VecData> m_rhs;
+		std::shared_ptr<VecData> m_output;
 };
 
-template<typename Data>
-class VecAdd : public VecBinOp<Data, Nz::ShaderAst::BinaryType::Add>
+class VecAdd : public VecBinOp<Nz::ShaderAst::BinaryType::Add>
 {
 	public:
-		using VecBinOp<Data, Nz::ShaderAst::BinaryType::Add>::VecBinOp;
+		using VecBinOp<Nz::ShaderAst::BinaryType::Add>::VecBinOp;
 
 		QString caption() const override;
 		QString name() const override;
@@ -46,11 +45,10 @@ class VecAdd : public VecBinOp<Data, Nz::ShaderAst::BinaryType::Add>
 		void ApplyOp(const std::uint8_t* left, const std::uint8_t* right, std::uint8_t* output, std::size_t pixelCount) override;
 };
 
-template<typename Data>
-class VecMul : public VecBinOp<Data, Nz::ShaderAst::BinaryType::Multiply>
+class VecMul : public VecBinOp<Nz::ShaderAst::BinaryType::Multiply>
 {
 	public:
-		using VecBinOp<Data, Nz::ShaderAst::BinaryType::Multiply>::VecBinOp;
+		using VecBinOp<Nz::ShaderAst::BinaryType::Multiply>::VecBinOp;
 
 		QString caption() const override;
 		QString name() const override;
@@ -58,11 +56,10 @@ class VecMul : public VecBinOp<Data, Nz::ShaderAst::BinaryType::Multiply>
 		void ApplyOp(const std::uint8_t* left, const std::uint8_t* right, std::uint8_t* output, std::size_t pixelCount) override;
 };
 
-template<typename Data>
-class VecSub : public VecBinOp<Data, Nz::ShaderAst::BinaryType::Substract>
+class VecSub : public VecBinOp<Nz::ShaderAst::BinaryType::Substract>
 {
 	public:
-		using VecBinOp<Data, Nz::ShaderAst::BinaryType::Substract>::VecBinOp;
+		using VecBinOp<Nz::ShaderAst::BinaryType::Substract>::VecBinOp;
 
 		QString caption() const override;
 		QString name() const override;
@@ -70,18 +67,6 @@ class VecSub : public VecBinOp<Data, Nz::ShaderAst::BinaryType::Substract>
 		void ApplyOp(const std::uint8_t* left, const std::uint8_t* right, std::uint8_t* output, std::size_t pixelCount) override;
 };
 
-using Vec2Add = VecAdd<Vec2Data>;
-using Vec3Add = VecAdd<Vec3Data>;
-using Vec4Add = VecAdd<Vec4Data>;
-
-using Vec2Mul = VecMul<Vec2Data>;
-using Vec3Mul = VecMul<Vec3Data>;
-using Vec4Mul = VecMul<Vec4Data>;
-
-using Vec2Sub = VecSub<Vec2Data>;
-using Vec3Sub = VecSub<Vec3Data>;
-using Vec4Sub = VecSub<Vec4Data>;
-
 #include <ShaderNode/DataModels/VecBinOp.inl>
 
 #endif
diff --git a/src/ShaderNode/DataModels/VecBinOp.inl b/src/ShaderNode/DataModels/VecBinOp.inl
index 2d33f65c6..7d3cf1e12 100644
--- a/src/ShaderNode/DataModels/VecBinOp.inl
+++ b/src/ShaderNode/DataModels/VecBinOp.inl
@@ -1,17 +1,15 @@
 #include <ShaderNode/DataModels/VecBinOp.hpp>
 #include <Nazara/Renderer/ShaderBuilder.hpp>
 
-template<typename Data, Nz::ShaderAst::BinaryType BinOp>
-VecBinOp<Data, BinOp>::VecBinOp(ShaderGraph& graph) :
+template<Nz::ShaderAst::BinaryType BinOp>
+VecBinOp<BinOp>::VecBinOp(ShaderGraph& graph) :
 ShaderNode(graph)
 {
-	m_output = std::make_shared<Data>();
-
 	UpdateOutput();
 }
 
-template<typename Data, Nz::ShaderAst::BinaryType BinOp>
-Nz::ShaderAst::ExpressionPtr VecBinOp<Data, BinOp>::GetExpression(Nz::ShaderAst::ExpressionPtr* expressions, std::size_t count) const
+template<Nz::ShaderAst::BinaryType BinOp>
+Nz::ShaderAst::ExpressionPtr VecBinOp<BinOp>::GetExpression(Nz::ShaderAst::ExpressionPtr* expressions, std::size_t count) const
 {
 	assert(count == 2);
 	using BuilderType = typename Nz::ShaderBuilder::template BinOpBuilder<BinOp>;
@@ -19,16 +17,16 @@ Nz::ShaderAst::ExpressionPtr VecBinOp<Data, BinOp>::GetExpression(Nz::ShaderAst:
 	return builder(expressions[0], expressions[1]);
 }
 
-template<typename Data, Nz::ShaderAst::BinaryType BinOp>
-QtNodes::NodeDataType VecBinOp<Data, BinOp>::dataType(QtNodes::PortType /*portType*/, QtNodes::PortIndex portIndex) const
+template<Nz::ShaderAst::BinaryType BinOp>
+QtNodes::NodeDataType VecBinOp<BinOp>::dataType(QtNodes::PortType /*portType*/, QtNodes::PortIndex portIndex) const
 {
 	assert(portIndex == 0 || portIndex == 1);
 
-	return Data::Type();
+	return VecData::Type();
 }
 
-template<typename Data, Nz::ShaderAst::BinaryType BinOp>
-unsigned int VecBinOp<Data, BinOp>::nPorts(QtNodes::PortType portType) const
+template<Nz::ShaderAst::BinaryType BinOp>
+unsigned int VecBinOp<BinOp>::nPorts(QtNodes::PortType portType) const
 {
 	switch (portType)
 	{
@@ -39,24 +37,24 @@ unsigned int VecBinOp<Data, BinOp>::nPorts(QtNodes::PortType portType) const
 	return 0;
 }
 
-template<typename Data, Nz::ShaderAst::BinaryType BinOp>
-std::shared_ptr<QtNodes::NodeData> VecBinOp<Data, BinOp>::outData(QtNodes::PortIndex port)
+template<Nz::ShaderAst::BinaryType BinOp>
+std::shared_ptr<QtNodes::NodeData> VecBinOp<BinOp>::outData(QtNodes::PortIndex port)
 {
 	assert(port == 0);
 	return m_output;
 }
 
-template<typename Data, Nz::ShaderAst::BinaryType BinOp>
-void VecBinOp<Data, BinOp>::setInData(std::shared_ptr<QtNodes::NodeData> value, int index)
+template<Nz::ShaderAst::BinaryType BinOp>
+void VecBinOp<BinOp>::setInData(std::shared_ptr<QtNodes::NodeData> value, int index)
 {
 	assert(index == 0 || index == 1);
 
-	std::shared_ptr<Data> castedValue;
+	std::shared_ptr<VecData> castedValue;
 	if (value)
 	{
-		assert(dynamic_cast<Data*>(value.get()) != nullptr);
+		assert(dynamic_cast<VecData*>(value.get()) != nullptr);
 
-		castedValue = std::static_pointer_cast<Data>(value);
+		castedValue = std::static_pointer_cast<VecData>(value);
 	}
 
 	if (index == 0)
@@ -67,8 +65,8 @@ void VecBinOp<Data, BinOp>::setInData(std::shared_ptr<QtNodes::NodeData> value,
 	UpdateOutput();
 }
 
-template<typename Data, Nz::ShaderAst::BinaryType BinOp>
-bool VecBinOp<Data, BinOp>::ComputePreview(QPixmap& pixmap)
+template<Nz::ShaderAst::BinaryType BinOp>
+bool VecBinOp<BinOp>::ComputePreview(QPixmap& pixmap)
 {
 	if (!m_lhs || !m_rhs)
 		return false;
@@ -77,16 +75,19 @@ bool VecBinOp<Data, BinOp>::ComputePreview(QPixmap& pixmap)
 	return true;
 }
 
-template<typename Data, Nz::ShaderAst::BinaryType BinOp>
-void VecBinOp<Data, BinOp>::UpdateOutput()
+template<Nz::ShaderAst::BinaryType BinOp>
+void VecBinOp<BinOp>::UpdateOutput()
 {
-	if (!m_lhs || !m_rhs)
+	if (!m_lhs || !m_rhs || m_lhs->componentCount != m_rhs->componentCount)
 	{
+		m_output = std::make_shared<VecData>(4);
 		m_output->preview = QImage(1, 1, QImage::Format_RGBA8888);
 		m_output->preview.fill(QColor::fromRgb(0, 0, 0, 0));
 		return;
 	}
 
+	m_output = std::make_shared<VecData>(m_lhs->componentCount);
+
 	const QImage& leftPreview = m_lhs->preview;
 	const QImage& rightPreview = m_rhs->preview;
 	int maxWidth = std::max(leftPreview.width(), rightPreview.width());
@@ -108,83 +109,3 @@ void VecBinOp<Data, BinOp>::UpdateOutput()
 
 	UpdatePreview();
 }
-
-template<typename Data>
-QString VecAdd<Data>::caption() const
-{
-	static QString caption = Data::Type().name + " addition";
-	return caption;
-}
-
-template<typename Data>
-QString VecAdd<Data>::name() const
-{
-	static QString name = Data::Type().name + "add";
-	return name;
-}
-
-template<typename Data>
-void VecAdd<Data>::ApplyOp(const std::uint8_t* left, const std::uint8_t* right, std::uint8_t* output, std::size_t pixelCount)
-{
-	for (std::size_t i = 0; i < pixelCount; ++i)
-	{
-		unsigned int lValue = left[i];
-		unsigned int rValue = right[i];
-
-		output[i] = static_cast<std::uint8_t>(std::min(lValue + rValue, 255U));
-	}
-}
-
-template<typename Data>
-QString VecMul<Data>::caption() const
-{
-	static QString caption = Data::Type().name + " multiplication";
-	return caption;
-}
-
-template<typename Data>
-QString VecMul<Data>::name() const
-{
-	static QString name = Data::Type().name + "mul";
-	return name;
-}
-
-template<typename Data>
-void VecMul<Data>::ApplyOp(const std::uint8_t* left, const std::uint8_t* right, std::uint8_t* output, std::size_t pixelCount)
-{
-	for (std::size_t i = 0; i < pixelCount; ++i)
-	{
-		unsigned int lValue = left[i];
-		unsigned int rValue = right[i];
-
-		output[i] = static_cast<std::uint8_t>(lValue * rValue / 255);
-	}
-}
-
-template<typename Data>
-QString VecSub<Data>::caption() const
-{
-	static QString caption = Data::Type().name + " subtraction";
-	return caption;
-}
-
-template<typename Data>
-QString VecSub<Data>::name() const
-{
-	static QString name = Data::Type().name + "sub";
-	return name;
-}
-
-template<typename Data>
-void VecSub<Data>::ApplyOp(const std::uint8_t* left, const std::uint8_t* right, std::uint8_t* output, std::size_t pixelCount)
-{
-	for (std::size_t i = 0; i < pixelCount; ++i)
-	{
-		unsigned int lValue = left[i];
-		unsigned int rValue = right[i];
-
-		unsigned int sub = (lValue >= rValue) ? lValue - rValue : 0u;
-
-		output[i] = static_cast<std::uint8_t>(sub);
-	}
-}
diff --git a/src/ShaderNode/DataModels/VecValue.hpp b/src/ShaderNode/DataModels/VecValue.hpp
index 50ff1f4e1..b115477e3 100644
--- a/src/ShaderNode/DataModels/VecValue.hpp
+++ b/src/ShaderNode/DataModels/VecValue.hpp
@@ -11,7 +11,7 @@
 #include <ShaderNode/DataTypes/VecData.hpp>
 #include <array>
 
-template<typename Data>
+template<std::size_t ComponentCount>
 class VecValue : public ShaderNode
 {
 	public:
@@ -34,16 +34,14 @@ class VecValue : public ShaderNode
 	private:
 		bool ComputePreview(QPixmap& pixmap) override;
 
-		static constexpr std::size_t ComponentCount = Data::ComponentCount;
-
 		QColor ToColor() const;
 
 		VecType<ComponentCount> m_value;
 };
 
-using Vec2Value = VecValue<Vec2Data>;
-using Vec3Value = VecValue<Vec3Data>;
-using Vec4Value = VecValue<Vec4Data>;
+using Vec2Value = VecValue<2>;
+using Vec3Value = VecValue<3>;
+using Vec4Value = VecValue<4>;
 
 #include <ShaderNode/DataModels/VecValue.inl>
 
diff --git a/src/ShaderNode/DataModels/VecValue.inl b/src/ShaderNode/DataModels/VecValue.inl
index 7f3a9dc5e..fd6d31be1 100644
--- a/src/ShaderNode/DataModels/VecValue.inl
+++ b/src/ShaderNode/DataModels/VecValue.inl
@@ -5,8 +5,8 @@
 #include <array>
 #include <tuple>
 
-template<typename Data>
-VecValue<Data>::VecValue(ShaderGraph& graph) :
+template<std::size_t ComponentCount>
+VecValue<ComponentCount>::VecValue(ShaderGraph& graph) :
 ShaderNode(graph)
 {
 	static_assert(ComponentCount <= s_vectorComponents.size());
@@ -21,55 +21,55 @@ ShaderNode(graph)
 	UpdatePreview();
 }
 
-template<typename Data>
-QString VecValue<Data>::caption() const
+template<std::size_t ComponentCount>
+QString VecValue<ComponentCount>::caption() const
 {
-	static QString caption = Data::Type().name + " constant";
+	static QString caption = "Vector" + QString::number(ComponentCount) + " constant";
 	return caption;
 }
 
-template<typename Data>
-QString VecValue<Data>::name() const
+template<std::size_t ComponentCount>
+QString VecValue<ComponentCount>::name() const
 {
-	static QString name = Data::Type().id + "Value";
+	static QString name = "vec" + QString::number(ComponentCount) + "_constant";
 	return name;
 }
 
-template<typename Data>
-QtNodes::NodeDataType VecValue<Data>::dataType(QtNodes::PortType portType, QtNodes::PortIndex portIndex) const
+template<std::size_t ComponentCount>
+QtNodes::NodeDataType VecValue<ComponentCount>::dataType(QtNodes::PortType portType, QtNodes::PortIndex portIndex) const
 {
 	assert(portType == QtNodes::PortType::Out);
 	assert(portIndex == 0);
 
-	return Data::Type();
+	return VecData::Type();
 }
 
-template<typename Data>
-unsigned int VecValue<Data>::nPorts(QtNodes::PortType portType) const
+template<std::size_t ComponentCount>
+unsigned int VecValue<ComponentCount>::nPorts(QtNodes::PortType portType) const
 {
 	switch (portType)
 	{
-		case QtNodes::PortType::In: return 0;
+		case QtNodes::PortType::In:  return 0;
 		case QtNodes::PortType::Out: return 1;
 	}
 
 	return 0;
 }
 
-template<typename Data>
-std::shared_ptr<QtNodes::NodeData> VecValue<Data>::outData(QtNodes::PortIndex port)
+template<std::size_t ComponentCount>
+std::shared_ptr<QtNodes::NodeData> VecValue<ComponentCount>::outData(QtNodes::PortIndex port)
 {
 	assert(port == 0);
 
-	auto out = std::make_shared<Data>();
+	auto out = std::make_shared<VecData>(ComponentCount);
 	out->preview = QImage(1, 1, QImage::Format_RGBA8888);
 	out->preview.fill(ToColor());
 
 	return out;
 }
 
-template<typename Data>
-void VecValue<Data>::BuildNodeEdition(QFormLayout* layout)
+template<std::size_t ComponentCount>
+void VecValue<ComponentCount>::BuildNodeEdition(QFormLayout* layout)
 {
 	ShaderNode::BuildNodeEdition(layout);
 
@@ -91,23 +91,23 @@ void VecValue<Data>::BuildNodeEdition(QFormLayout* layout)
 	}
 }
 
-template<typename Data>
-Nz::ShaderAst::ExpressionPtr VecValue<Data>::GetExpression(Nz::ShaderAst::ExpressionPtr* /*expressions*/, std::size_t count) const
+template<std::size_t ComponentCount>
+Nz::ShaderAst::ExpressionPtr VecValue<ComponentCount>::GetExpression(Nz::ShaderAst::ExpressionPtr* /*expressions*/, std::size_t count) const
 {
 	assert(count == 0);
 
 	return Nz::ShaderBuilder::Constant(m_value);
 }
 
-template<typename Data>
-bool VecValue<Data>::ComputePreview(QPixmap& pixmap)
+template<std::size_t ComponentCount>
+bool VecValue<ComponentCount>::ComputePreview(QPixmap& pixmap)
 {
 	pixmap.fill(ToColor());
 	return true;
 }
 
-template<typename Data>
-QColor VecValue<Data>::ToColor() const
+template<std::size_t ComponentCount>
+QColor VecValue<ComponentCount>::ToColor() const
 {
 	std::array<float, 4> values = { 0.f, 0.f, 0.f, 1.f };
 
diff --git a/src/ShaderNode/DataTypes/FloatData.cpp b/src/ShaderNode/DataTypes/FloatData.cpp
new file mode 100644
index 000000000..0b1f99d61
--- /dev/null
+++ b/src/ShaderNode/DataTypes/FloatData.cpp
@@ -0,0 +1 @@
+#include <ShaderNode/DataTypes/VecData.hpp>
diff --git a/src/ShaderNode/DataTypes/FloatData.hpp b/src/ShaderNode/DataTypes/FloatData.hpp
new file mode 100644
index 000000000..e0f0451d2
--- /dev/null
+++ b/src/ShaderNode/DataTypes/FloatData.hpp
@@ -0,0 +1,28 @@
+#pragma once
+
+#ifndef NAZARA_SHADERNODES_FLOATDATA_HPP
+#define NAZARA_SHADERNODES_FLOATDATA_HPP
+
+#include <nodes/NodeData>
+#include <QtGui/QImage>
+
+struct FloatData : public QtNodes::NodeData
+{
+	inline FloatData();
+
+	QtNodes::NodeDataType type() const override
+	{
+		return Type();
+	}
+
+	static QtNodes::NodeDataType Type()
+	{
+		return { "float", "Float" };
+	}
+
+	QImage preview;
+};
+
+#include <ShaderNode/DataTypes/FloatData.inl>
+
+#endif
diff --git a/src/ShaderNode/DataTypes/FloatData.inl b/src/ShaderNode/DataTypes/FloatData.inl
new file mode 100644
index 000000000..3960c5811
--- /dev/null
+++ b/src/ShaderNode/DataTypes/FloatData.inl
@@ -0,0 +1,7 @@
+#include <ShaderNode/DataTypes/FloatData.hpp>
+
+inline FloatData::FloatData() :
+preview(1, 1, QImage::Format_RGBA8888)
+{
+	preview.fill(QColor::fromRgb(255, 255, 255, 0));
+}
diff --git a/src/ShaderNode/DataTypes/VecData.cpp b/src/ShaderNode/DataTypes/VecData.cpp
index 0b1f99d61..c1f883079 100644
--- a/src/ShaderNode/DataTypes/VecData.cpp
+++ b/src/ShaderNode/DataTypes/VecData.cpp
@@ -1 +1,18 @@
 #include <ShaderNode/DataTypes/VecData.hpp>
+#include <cassert>
+#include <stdexcept>
+
+Nz::ShaderAst::ExpressionType VecData::GetExpressionType() const
+{
+	switch (componentCount)
+	{
+		case 2: return Nz::ShaderAst::ExpressionType::Float2;
+		case 3: return Nz::ShaderAst::ExpressionType::Float3;
+		case 4: return Nz::ShaderAst::ExpressionType::Float4;
+		default:
+			break;
+	}
+
+	assert(false);
+	throw std::runtime_error("invalid component count");
+}
diff --git a/src/ShaderNode/DataTypes/VecData.hpp b/src/ShaderNode/DataTypes/VecData.hpp
index 447d37686..5c19be942 100644
--- a/src/ShaderNode/DataTypes/VecData.hpp
+++ b/src/ShaderNode/DataTypes/VecData.hpp
@@ -9,59 +9,48 @@
 
 struct VecData : public QtNodes::NodeData
 {
-	inline VecData();
+	inline VecData(std::size_t componentCount);
 
+	inline QtNodes::NodeDataType type() const override;
+
+	Nz::ShaderAst::ExpressionType GetExpressionType() const;
+
+	static inline QtNodes::NodeDataType Type();
+
+	std::size_t componentCount;
 	QImage preview;
 };
 
-struct Vec2Data : public VecData
+template<std::size_t N>
+struct VecExpressionTypeHelper;
+
+template<>
+struct VecExpressionTypeHelper<1>
+{
+	static constexpr Nz::ShaderAst::ExpressionType ExpressionType = Nz::ShaderAst::ExpressionType::Float1;
+};
+
+template<>
+struct VecExpressionTypeHelper<2>
 {
-	static constexpr std::size_t ComponentCount = 2;
 	static constexpr Nz::ShaderAst::ExpressionType ExpressionType = Nz::ShaderAst::ExpressionType::Float2;
-
-	QtNodes::NodeDataType type() const override
-	{
-		return Type();
-	}
-
-	static QtNodes::NodeDataType Type()
-	{
-		return { "vec2", "Vec2" };
-	}
 };
 
-struct Vec3Data : public VecData
+template<>
+struct VecExpressionTypeHelper<3>
 {
-	static constexpr std::size_t ComponentCount = 3;
 	static constexpr Nz::ShaderAst::ExpressionType ExpressionType = Nz::ShaderAst::ExpressionType::Float3;
-
-	QtNodes::NodeDataType type() const override
-	{
-		return Type();
-	}
-
-	static QtNodes::NodeDataType Type()
-	{
-		return { "vec3", "Vec3" };
-	}
 };
 
-struct Vec4Data : public VecData
+template<>
+struct VecExpressionTypeHelper<4>
 {
-	static constexpr std::size_t ComponentCount = 4;
 	static constexpr Nz::ShaderAst::ExpressionType ExpressionType = Nz::ShaderAst::ExpressionType::Float4;
-
-	QtNodes::NodeDataType type() const override
-	{
-		return Type();
-	}
-
-	static QtNodes::NodeDataType Type()
-	{
-		return { "vec4", "Vec4" };
-	}
 };
 
+template<std::size_t N> constexpr Nz::ShaderAst::ExpressionType VecExpressionType = VecExpressionTypeHelper<N>::template ExpressionType;
+
+
 struct VecTypeDummy {};
 
 template<std::size_t N>
@@ -76,7 +65,7 @@ struct VecTypeHelper<0>
 template<>
 struct VecTypeHelper<1>
 {
-	using Type = std::array<float, 1>;
+	using Type = std::array<float, 1>; //< To allow [0]
 };
 
 template<>
diff --git a/src/ShaderNode/DataTypes/VecData.inl b/src/ShaderNode/DataTypes/VecData.inl
index 255fbd9ab..a84b5c344 100644
--- a/src/ShaderNode/DataTypes/VecData.inl
+++ b/src/ShaderNode/DataTypes/VecData.inl
@@ -1,7 +1,18 @@
 #include <ShaderNode/DataTypes/VecData.hpp>
 
-inline VecData::VecData() :
+inline VecData::VecData(std::size_t ComponentCount) :
+componentCount(ComponentCount),
 preview(64, 64, QImage::Format_RGBA8888)
 {
 	preview.fill(QColor::fromRgb(255, 255, 255, 0));
 }
+
+inline QtNodes::NodeDataType VecData::type() const
+{
+	return Type();
+}
+
+inline QtNodes::NodeDataType VecData::Type()
+{
+	return { "vector", "Vector" };
+}
diff --git a/src/ShaderNode/Enums.cpp b/src/ShaderNode/Enums.cpp
index fd99c5562..1f756b8de 100644
--- a/src/ShaderNode/Enums.cpp
+++ b/src/ShaderNode/Enums.cpp
@@ -1,6 +1,21 @@
 #include <ShaderNode/Enums.hpp>
 #include <cassert>
 
+std::size_t GetComponentCount(InOutType type)
+{
+	switch (type)
+	{
+		case InOutType::Bool:   return 1;
+		case InOutType::Float1: return 1;
+		case InOutType::Float2: return 2;
+		case InOutType::Float3: return 3;
+		case InOutType::Float4: return 4;
+	}
+
+	assert(false);
+	return 0;
+}
+
 const char* EnumToString(InputRole role)
 {
 	switch (role)
diff --git a/src/ShaderNode/Enums.hpp b/src/ShaderNode/Enums.hpp
index ba990fdcf..f67623a3f 100644
--- a/src/ShaderNode/Enums.hpp
+++ b/src/ShaderNode/Enums.hpp
@@ -39,6 +39,8 @@ enum class TextureType
 
 constexpr std::size_t TextureTypeCount = static_cast<std::size_t>(TextureType::Max) + 1;
 
+
+std::size_t GetComponentCount(InOutType type);
 const char* EnumToString(InputRole role);
 const char* EnumToString(InOutType input);
 const char* EnumToString(TextureType textureType);
diff --git a/src/ShaderNode/ShaderGraph.cpp b/src/ShaderNode/ShaderGraph.cpp
index 876b0f1a3..63a29a6a0 100644
--- a/src/ShaderNode/ShaderGraph.cpp
+++ b/src/ShaderNode/ShaderGraph.cpp
@@ -58,7 +58,7 @@ m_flowScene(BuildRegistry())
 	auto& node3 = m_flowScene.createNode(std::make_unique<SampleTexture>(*this));
 	node3.nodeGraphicsObject().setPos(200, 200);
 
-	auto& node4 = m_flowScene.createNode(std::make_unique<Vec4Mul>(*this));
+	auto& node4 = m_flowScene.createNode(std::make_unique<VecMul>(*this));
 	node4.nodeGraphicsObject().setPos(400, 200);
 
 	auto& node5 = m_flowScene.createNode(std::make_unique<OutputValue>(*this));
@@ -154,6 +154,8 @@ Nz::ShaderAst::StatementPtr ShaderGraph::ToAst()
 	HandleNode = [&](QtNodes::Node* node) -> Nz::ShaderAst::ExpressionPtr
 	{
 		ShaderNode* shaderNode = static_cast<ShaderNode*>(node->nodeDataModel());
+		if (shaderNode->validationState() != QtNodes::NodeValidationState::Valid)
+			throw std::runtime_error(shaderNode->validationMessage().toStdString());
 
 		qDebug() << shaderNode->name() << node->id();
 		if (auto it = variableExpressions.find(node->id()); it != variableExpressions.end())
@@ -211,21 +213,13 @@ Nz::ShaderAst::StatementPtr ShaderGraph::ToAst()
 			return expression;
 	};
 
-	try
+	m_flowScene.iterateOverNodes([&](QtNodes::Node* node)
 	{
-		m_flowScene.iterateOverNodes([&](QtNodes::Node* node)
+		if (node->nodeDataModel()->nPorts(QtNodes::PortType::Out) == 0)
 		{
-			if (node->nodeDataModel()->nPorts(QtNodes::PortType::Out) == 0)
-			{
-				statements.emplace_back(Nz::ShaderBuilder::ExprStatement(HandleNode(node)));
-			}
-		});
-	}
-	catch (const std::exception&)
-	{
-
-		return nullptr;
-	}
+			statements.emplace_back(Nz::ShaderBuilder::ExprStatement(HandleNode(node)));
+		}
+	});
 
 	return std::make_shared<Nz::ShaderAst::StatementBlock>(std::move(statements));
 }
@@ -265,25 +259,16 @@ void ShaderGraph::UpdateTexturePreview(std::size_t textureIndex, QImage preview)
 std::shared_ptr<QtNodes::DataModelRegistry> ShaderGraph::BuildRegistry()
 {
 	auto registry = std::make_shared<QtNodes::DataModelRegistry>();
-	RegisterShaderNode<CastVec2ToVec3>(*this, registry, "Casts");
-	RegisterShaderNode<CastVec2ToVec4>(*this, registry, "Casts");
-	RegisterShaderNode<CastVec3ToVec2>(*this, registry, "Casts");
-	RegisterShaderNode<CastVec3ToVec4>(*this, registry, "Casts");
-	RegisterShaderNode<CastVec4ToVec2>(*this, registry, "Casts");
-	RegisterShaderNode<CastVec4ToVec3>(*this, registry, "Casts");
+	RegisterShaderNode<CastToVec2>(*this, registry, "Casts");
+	RegisterShaderNode<CastToVec3>(*this, registry, "Casts");
+	RegisterShaderNode<CastToVec4>(*this, registry, "Casts");
 	RegisterShaderNode<InputValue>(*this, registry, "Inputs");
 	RegisterShaderNode<OutputValue>(*this, registry, "Outputs");
 	RegisterShaderNode<SampleTexture>(*this, registry, "Texture");
 	RegisterShaderNode<TextureValue>(*this, registry, "Texture");
-	RegisterShaderNode<Vec2Add>(*this, registry, "Vector operations");
-	RegisterShaderNode<Vec2Mul>(*this, registry, "Vector operations");
-	RegisterShaderNode<Vec2Sub>(*this, registry, "Vector operations");
-	RegisterShaderNode<Vec3Add>(*this, registry, "Vector operations");
-	RegisterShaderNode<Vec3Mul>(*this, registry, "Vector operations");
-	RegisterShaderNode<Vec3Sub>(*this, registry, "Vector operations");
-	RegisterShaderNode<Vec4Add>(*this, registry, "Vector operations");
-	RegisterShaderNode<Vec4Mul>(*this, registry, "Vector operations");
-	RegisterShaderNode<Vec4Sub>(*this, registry, "Vector operations");
+	RegisterShaderNode<VecAdd>(*this, registry, "Vector operations");
+	RegisterShaderNode<VecMul>(*this, registry, "Vector operations");
+	RegisterShaderNode<VecSub>(*this, registry, "Vector operations");
 	RegisterShaderNode<Vec2Value>(*this, registry, "Constants");
 	RegisterShaderNode<Vec3Value>(*this, registry, "Constants");
 	RegisterShaderNode<Vec4Value>(*this, registry, "Constants");
diff --git a/src/ShaderNode/Widgets/MainWindow.cpp b/src/ShaderNode/Widgets/MainWindow.cpp
index ca0bd4c0a..505c1f285 100644
--- a/src/ShaderNode/Widgets/MainWindow.cpp
+++ b/src/ShaderNode/Widgets/MainWindow.cpp
@@ -8,6 +8,7 @@
 #include <nodes/FlowView>
 #include <QtWidgets/QDockWidget>
 #include <QtWidgets/QMenuBar>
+#include <QtWidgets/QMessageBox>
 #include <QtWidgets/QTextEdit>
 #include <iostream>
 
@@ -83,15 +84,22 @@ void MainWindow::BuildMenu()
 
 void MainWindow::OnCompileToGLSL()
 {
-	Nz::GlslWriter writer;
-	Nz::String glsl = writer.Generate(m_shaderGraph.ToAst());
+	try
+	{
+		Nz::GlslWriter writer;
+		Nz::String glsl = writer.Generate(m_shaderGraph.ToAst());
 
-	std::cout << glsl << std::endl;
+		std::cout << glsl << std::endl;
 
-	QTextEdit* output = new QTextEdit;
-	output->setReadOnly(true);
-	output->setText(QString::fromUtf8(glsl.GetConstBuffer(), int(glsl.GetSize())));
-	output->setAttribute(Qt::WA_DeleteOnClose, true);
-	output->setWindowTitle("GLSL Output");
-	output->show();
+		QTextEdit* output = new QTextEdit;
+		output->setReadOnly(true);
+		output->setText(QString::fromUtf8(glsl.GetConstBuffer(), int(glsl.GetSize())));
+		output->setAttribute(Qt::WA_DeleteOnClose, true);
+		output->setWindowTitle("GLSL Output");
+		output->show();
+	}
+	catch (const std::exception& e)
+	{
+		QMessageBox::critical(this, tr("Compilation failed"), QString("Compilation failed: ") + e.what());
+	}
 }