diff --git a/CMakeLists.txt b/CMakeLists.txt
index 639092f..667e4c6 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -56,52 +56,53 @@ qt_add_executable(${AppExec}
     src/Engine/Network/NetworkManager.cpp
 
     src/Engine/Operator/GOP_test.cpp
+    src/Engine/Operator/GOP_transform.cpp
 )
 
 target_link_libraries(${AppExec} PRIVATE Qt6::Core Qt6::Widgets Qt6::SvgWidgets Qt6::OpenGLWidgets glm::glm Eigen3::Eigen TBB::tbb)
 target_include_directories(${AppExec} PUBLIC src)
 
 # tests
-Include(FetchContent)
+# Include(FetchContent)
 
-FetchContent_Declare(
-  Catch2
-  GIT_REPOSITORY https://github.com/catchorg/Catch2.git
-  GIT_TAG        v3.8.1 # or a later release
-)
+# FetchContent_Declare(
+#   Catch2
+#   GIT_REPOSITORY https://github.com/catchorg/Catch2.git
+#   GIT_TAG        v3.8.1 # or a later release
+# )
 
-FetchContent_MakeAvailable(Catch2)
+# FetchContent_MakeAvailable(Catch2)
 
-add_executable(${TestExec}
-    tests/main-tests.cpp
-    tests/OperatorTests.cpp
-    tests/NetworkTests.cpp
+# add_executable(${TestExec}
+#     tests/main-tests.cpp
+#     tests/OperatorTests.cpp
+#     tests/NetworkTests.cpp
 
-    src/Engine/Operator/Attribute.cpp
-    src/Engine/Operator/Geometry.cpp
-    src/Engine/Operator/GeometryOperator.cpp
-    src/Engine/Network/NetworkManager.cpp
-    src/Engine/Operator/GeometryConnection.cpp
-    src/Engine/Operator/GeometryOpDef.cpp
-    src/Engine/Operator/GOP_test.cpp
-)
-target_link_libraries(${TestExec} PRIVATE Catch2::Catch2WithMain Eigen3::Eigen Qt6::Core TBB::tbb)
-target_compile_definitions(${TestExec} PRIVATE UNIT_TEST)
-target_include_directories(${TestExec} PUBLIC src)
+#     src/Engine/Operator/Attribute.cpp
+#     src/Engine/Operator/Geometry.cpp
+#     src/Engine/Operator/GeometryOperator.cpp
+#     src/Engine/Network/NetworkManager.cpp
+#     src/Engine/Operator/GeometryConnection.cpp
+#     src/Engine/Operator/GeometryOpDef.cpp
+#     src/Engine/Operator/GOP_test.cpp
+# )
+# target_link_libraries(${TestExec} PRIVATE Catch2::Catch2WithMain Eigen3::Eigen Qt6::Core TBB::tbb)
+# target_compile_definitions(${TestExec} PRIVATE UNIT_TEST)
+# target_include_directories(${TestExec} PUBLIC src)
 
-# benchmarks
-add_executable(${BenchExec}
-    tests/Benchmarks.cpp
+# # benchmarks
+# add_executable(${BenchExec}
+#     tests/Benchmarks.cpp
 
-    src/Engine/Operator/Attribute.cpp
-    src/Engine/Operator/Geometry.cpp
-    src/Engine/Operator/GeometryOperator.cpp
-    src/Engine/Network/NetworkManager.cpp
-    src/Engine/Operator/GeometryConnection.cpp
-    src/Engine/Operator/GeometryOpDef.cpp
-    src/Engine/Operator/GOP_test.cpp
-)
-target_link_libraries(${BenchExec} PRIVATE Catch2::Catch2WithMain Eigen3::Eigen Qt6::Core  TBB::tbb)
-target_compile_definitions(${BenchExec} PRIVATE UNIT_TEST)
-target_include_directories(${BenchExec} PUBLIC src)
+#     src/Engine/Operator/Attribute.cpp
+#     src/Engine/Operator/Geometry.cpp
+#     src/Engine/Operator/GeometryOperator.cpp
+#     src/Engine/Network/NetworkManager.cpp
+#     src/Engine/Operator/GeometryConnection.cpp
+#     src/Engine/Operator/GeometryOpDef.cpp
+#     src/Engine/Operator/GOP_test.cpp
+# )
+# target_link_libraries(${BenchExec} PRIVATE Catch2::Catch2WithMain Eigen3::Eigen Qt6::Core  TBB::tbb)
+# target_compile_definitions(${BenchExec} PRIVATE UNIT_TEST)
+# target_include_directories(${BenchExec} PUBLIC src)
 
diff --git a/src/Engine/Network/NetworkManager.cpp b/src/Engine/Network/NetworkManager.cpp
index ac36091..5a536f6 100644
--- a/src/Engine/Network/NetworkManager.cpp
+++ b/src/Engine/Network/NetworkManager.cpp
@@ -1,5 +1,4 @@
 #include "Engine/Network/NetworkManager.h"
-#include "Engine/Operator/GOP_test.h"
 #include "Engine/Operator/Geometry.h"
 #include "Engine/Operator/GeometryOperator.h"
 #include "Engine/Operator/Attribute.h"
@@ -11,11 +10,11 @@
 #include <algorithm>
 #include <string>
 
-enzo::nt::OpId enzo::nt::NetworkManager::addOperator()
+enzo::nt::OpId enzo::nt::NetworkManager::addOperator(nt::opConstructor ctorFunc)
 {
 
     maxOpId_++;
-    gopStore_.emplace(maxOpId_, std::make_unique<GeometryOperator>(maxOpId_, &GOP_test::ctor));
+    gopStore_.emplace(maxOpId_, std::make_unique<GeometryOperator>(maxOpId_, ctorFunc));
     std::cout << "adding operator " << maxOpId_ << "\n";
 
     return maxOpId_;
diff --git a/src/Engine/Network/NetworkManager.h b/src/Engine/Network/NetworkManager.h
index 4a034e0..37608ae 100644
--- a/src/Engine/Network/NetworkManager.h
+++ b/src/Engine/Network/NetworkManager.h
@@ -18,7 +18,7 @@ public:
     static NetworkManager* getInstance();
 
     // functions
-    static OpId addOperator();
+    static OpId addOperator(nt::opConstructor ctorFunc);
     static std::optional<OpId> getDisplayOp();
     static bool isValidOp(nt::OpId opId);
     static GeometryOperator& getGeoOperator(nt::OpId opId);
diff --git a/src/Engine/Operator/GOP_transform.cpp b/src/Engine/Operator/GOP_transform.cpp
new file mode 100644
index 0000000..1311345
--- /dev/null
+++ b/src/Engine/Operator/GOP_transform.cpp
@@ -0,0 +1,42 @@
+#include "Engine/Operator/GOP_transform.h"
+#include "Engine/Operator/AttributeHandle.h"
+#include <oneapi/tbb/parallel_for.h>
+
+GOP_transform::GOP_transform(enzo::nt::OpId opId)
+: enzo::nt::GeometryOpDef(opId)
+{
+
+}
+
+void GOP_transform::cookOp()
+{
+    using namespace enzo;
+    // std::cout << "COOKING\n";
+
+    if(outputRequested(0))
+    {
+        // copy input geometry
+        geo::Geometry geo = cloneInputGeo(0);
+
+        // ----
+        // create geometry start
+        // ----
+        auto PAttr = geo.getAttribByName(ga::AttrOwner::POINT, "P");
+        ga::AttributeHandleVector3 PAttrHandle(PAttr);
+
+        for(int i=0; i<PAttrHandle.getAllValues().size(); ++i)
+        {
+            enzo::bt::Vector3 vector = PAttrHandle.getValue(i);
+            vector.y()+=2.5;
+            PAttrHandle.setValue(i, vector);
+        }
+        // ----
+
+
+
+        // set output geometry
+        setOutputGeometry(0, geo);
+    }
+
+}
+
diff --git a/src/Engine/Operator/GOP_transform.h b/src/Engine/Operator/GOP_transform.h
new file mode 100644
index 0000000..6c75997
--- /dev/null
+++ b/src/Engine/Operator/GOP_transform.h
@@ -0,0 +1,15 @@
+#pragma once
+#include "Engine/Operator/GeometryOpDef.h"
+
+class GOP_transform
+: public enzo::nt::GeometryOpDef
+{
+public:
+    GOP_transform(enzo::nt::OpId opId);
+    virtual void cookOp();
+    static enzo::nt::GeometryOpDef* ctor(enzo::nt::OpId opId)
+    {
+        return new GOP_transform(opId);
+    }
+
+};
diff --git a/src/Engine/Operator/GeometryOpDef.h b/src/Engine/Operator/GeometryOpDef.h
index 4e730f1..f619c3f 100644
--- a/src/Engine/Operator/GeometryOpDef.h
+++ b/src/Engine/Operator/GeometryOpDef.h
@@ -4,6 +4,7 @@
 
 namespace enzo::nt
 {
+
 class GeometryOpDef
 {
 public:
@@ -24,4 +25,6 @@ protected:
     // TODO: std::move geometry instead of copying
     void setOutputGeometry(unsigned int outputIndex, enzo::geo::Geometry geometry);
 };
+
+using opConstructor = GeometryOpDef* (*)(enzo::nt::OpId);
 }
diff --git a/src/Engine/Operator/GeometryOperator.cpp b/src/Engine/Operator/GeometryOperator.cpp
index 350eb5d..718b267 100644
--- a/src/Engine/Operator/GeometryOperator.cpp
+++ b/src/Engine/Operator/GeometryOperator.cpp
@@ -21,7 +21,7 @@ void enzo::nt::connectOperators(enzo::nt::OpId inputOpId, unsigned int inputInde
     outputOp.addInputConnection(newConnection);
 }
 
-nt::GeometryOperator::GeometryOperator(enzo::nt::OpId opId, enzo::nt::GeometryOpDef* (*ctorFunc)(enzo::nt::OpId))
+nt::GeometryOperator::GeometryOperator(enzo::nt::OpId opId, nt::opConstructor ctorFunc)
 : opId_{opId}, opDef_(ctorFunc(opId))
 {
     // TODO: drive by geometry definition
diff --git a/src/Engine/Types.h b/src/Engine/Types.h
index 84ff885..546cdfe 100644
--- a/src/Engine/Types.h
+++ b/src/Engine/Types.h
@@ -37,5 +37,6 @@ namespace enzo
             Input,
             Output
         };
+
     }
 }
diff --git a/src/Gui/Network/Network.cpp b/src/Gui/Network/Network.cpp
index ee5b25e..4ffdfcf 100644
--- a/src/Gui/Network/Network.cpp
+++ b/src/Gui/Network/Network.cpp
@@ -18,6 +18,8 @@
 #include <qgraphicsitem.h>
 #include <qnamespace.h>
 #include <QLine>
+#include "Engine/Operator/GOP_test.h"
+#include "Engine/Operator/GOP_transform.h"
 
 using namespace enzo;
 
@@ -286,7 +288,16 @@ void Network::keyPressEvent(QKeyEvent *event)
         }
         case(Qt::Key_Tab):
         {
-            if(auto newNode = createNode())
+            if(auto newNode = createNode(&GOP_test::ctor))
+            {
+                newNode->setPos(viewPos);
+            }
+
+            break;
+        }
+        case(Qt::Key_F):
+        {
+            if(auto newNode = createNode(&GOP_transform::ctor))
             {
                 newNode->setPos(viewPos);
             }
@@ -296,9 +307,9 @@ void Network::keyPressEvent(QKeyEvent *event)
     }
 }
 
-NodeGraphic* Network::createNode()
+NodeGraphic* Network::createNode(nt::opConstructor ctorFunc)
 {
-    if(nt::OpId id = nt::NetworkManager::addOperator())
+    if(nt::OpId id = nt::NetworkManager::addOperator(ctorFunc))
     {
         NodeGraphic* newNode = new NodeGraphic(id);
         scene_->addItem(newNode);
diff --git a/src/Gui/Network/Network.h b/src/Gui/Network/Network.h
index 0aaf67d..82e853d 100644
--- a/src/Gui/Network/Network.h
+++ b/src/Gui/Network/Network.h
@@ -55,7 +55,7 @@ private:
     void destroyFloatingEdge();
     void deleteEdge(QGraphicsItem* edge);
 
-    NodeGraphic* createNode();
+    NodeGraphic* createNode(enzo::nt::opConstructor ctorFunc);
 
     void highlightEdge(QGraphicsItem* edge, bool state);
     void leftMousePressed(QMouseEvent* event);