The zip file contains a single c++ and a README with a g++ command line instruction. To avoid build issues (the given command line does not work on my macOS Catalina), I have created a small CMakeLists.txt (after renaming the harm_simple.cp to harm_simple.cpp): project(harmonic) find_package(CGAL REQUIRED COMPONENTS Core) add_executable(harm_simple harm_simple.cpp) target_link_libraries(harm_simple CGAL::CGAL CGAL::CGAL_Core) Once compiled, I was able to produce some optimized tetrahedral meshes but I was not able to check the results (the tetview viewer does not work anymore on macOS Catalina).
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Please consider to cut/paste/edit the raw JSON data attached to this paper.