Add Scaling, Rotation, and Translation that is based on evaluation of Lua scripts

include/openspace/scene/scale.h

@@ -47,10 +47,13 @@ public:
     virtual ~Scale() = default;
 
     virtual bool initialize();
-    virtual double scaleValue() const = 0;
+    virtual double scaleValue() const;
     virtual void update(const UpdateData& data);
 
     static documentation::Documentation Documentation();
+
+protected:
+    double _scale;
 };
 
 }  // namespace openspace

include/openspace/scene/translation.h

@@ -48,7 +48,7 @@ public:
     virtual ~Translation() = default;
     virtual bool initialize();
 
-    virtual glm::dvec3 position() const = 0;
+    virtual glm::dvec3 position() const;
     virtual void update(const UpdateData& data);
 
     glm::dvec3 position(double time);
@@ -63,6 +63,8 @@ protected:
     void notifyObservers();
 
     std::function<void()> _onParameterChangeCallback;
+
+    glm::dvec3 _positionValue;
 };
 
 } // namespace openspace