diff --git a/src/eal.cpp b/src/eal.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a8b101a90eef3758e59965fb91d7686c253e92f4
--- /dev/null
+++ b/src/eal.cpp
@@ -0,0 +1,19 @@
+
+#include <json.hpp>
+
+using json = nlohmann::json;
+
+
+std::string eal::constructStateFromIsd(const std::string positionRotationData) const
+{
+   // Parse the position and rotation data from isd
+   json isd = json::parse(positionRotationData);
+   json state;
+
+   state["m_w"] = isd.at("w");
+   state["m_x"] = isd.at("x");
+   state["m_y"] = isd.at("y");
+   state["m_z"] = isd.at("z");
+
+   return state.dump();
+}