Migrate F3OF DT3 test from demos to regression tests

- Migrate F3OF DT3 decay test from demos/f3of to tests/regression/f3of
- Add multi-column comparison support to compare_template.py for flap fore/aft pitch plots
- Fix version detection in plots to show correct HydroChrono and Chrono versions
- Standardize regression test comparison patterns for future tests
- Update CMakeLists.txt with proper environment variables for version detection

Author: dav-og

tests/regression/CMakeLists.txt

@@ -75,6 +75,90 @@ if(TARGET sphere_decay_test)
         LABELS "regression;sphere;decay;reference;core"
         FIXTURES_REQUIRED sphere_decay_regression_file
         WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/tests/regression/sphere
-        ENVIRONMENT "PATH=${Python3_ROOT_DIR};$ENV{PATH}"
+        ENVIRONMENT "PATH=${Python3_ROOT_DIR};$ENV{PATH};HYDROCHRONO_BUILD_DIR=${CMAKE_BINARY_DIR}"
+    )
+endif() 
+
+# F3OF DT3 Regression Test
+# ========================
+
+# Create executable in model-based directory
+add_executable(f3of_dt3_test)
+
+set(F3OF_SRC_DIR ${CMAKE_CURRENT_SOURCE_DIR}/f3of)
+set(F3OF_RELEASE_DIR ${CMAKE_BINARY_DIR}/tests/regression/Release/f3of)
+set(F3OF_RESULTS_DIR ${F3OF_RELEASE_DIR}/results)
+
+# Use model-based source and let simulation create results automatically
+set_target_properties(f3of_dt3_test
+    PROPERTIES
+    RUNTIME_OUTPUT_DIRECTORY ${F3OF_RELEASE_DIR}
+    RUNTIME_OUTPUT_DIRECTORY_DEBUG ${F3OF_RELEASE_DIR}
+    RUNTIME_OUTPUT_DIRECTORY_RELEASE ${F3OF_RELEASE_DIR}
+)
+
+target_sources(
+    f3of_dt3_test
+    PRIVATE
+        ${F3OF_SRC_DIR}/f3of_dt3_test.cpp
+)
+
+if(HYDROCHRONO_ENABLE_IRRLICHT)
+    target_compile_definitions(f3of_dt3_test 
+        PRIVATE 
+        HYDROCHRONO_HAVE_IRRLICHT=1
+        "CHRONO_DATA_DIR=\"${CHRONO_DATA_DIR}\""
+    )
+endif()
+
+target_include_directories(
+    f3of_dt3_test
+    PRIVATE
+        ${CMAKE_CURRENT_SOURCE_DIR}/../../../../src
+        ${CMAKE_CURRENT_SOURCE_DIR}/../../../../src/gui
+)
+
+target_link_libraries(
+    f3of_dt3_test
+    PRIVATE
+        HydroChrono
+        HydroChronoGUI
+)
+
+# Register as CTest test
+if(TARGET f3of_dt3_test)
+    # Copy test data to the output directory
+    file(COPY ${CMAKE_CURRENT_SOURCE_DIR}/data DESTINATION ${CMAKE_BINARY_DIR}/tests/regression/Release)
+    
+    add_test(
+        NAME f3of_dt3_regression
+        COMMAND ${F3OF_RELEASE_DIR}/f3of_dt3_test.exe ${HYDROCHRONO_DATA_DIR} --nogui
+    )
+    
+    set_tests_properties(
+        f3of_dt3_regression
+        PROPERTIES 
+        LABELS "regression;f3of;dt3;decay;core"
+        FIXTURES_SETUP f3of_dt3_regression_file
+        WORKING_DIRECTORY ${F3OF_RELEASE_DIR}
+        ENVIRONMENT "${TEST_ENVIRONMENT}"
+    )
+
+    # Reference comparison test - use the new centralized reference data location
+    set(FILE_RST ${F3OF_RESULTS_DIR}/f3of_dt3.txt)
+    set(FILE_REF ${CMAKE_SOURCE_DIR}/tests/regression/reference_data/f3of/dt3/f3of_dt3_hc_data.txt)
+
+    add_test(
+        NAME f3of_dt3_regression_ref
+        COMMAND python compare.py ${FILE_REF} ${FILE_RST}
+    )
+    
+    set_tests_properties(
+        f3of_dt3_regression_ref
+        PROPERTIES 
+        LABELS "regression;f3of;dt3;decay;reference;core"
+        FIXTURES_REQUIRED f3of_dt3_regression_file
+        WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}/tests/regression/f3of
+        ENVIRONMENT "PATH=${Python3_ROOT_DIR};$ENV{PATH};HYDROCHRONO_BUILD_DIR=${CMAKE_BINARY_DIR}"
     )
 endif()