diff --git a/src/src/Rendering/Measure/RulerAnnotationActor.cpp b/src/src/Rendering/Measure/RulerAnnotationActor.cpp
index 71e284d..6b11c4e 100644
--- a/src/src/Rendering/Measure/RulerAnnotationActor.cpp
+++ b/src/src/Rendering/Measure/RulerAnnotationActor.cpp
@@ -75,4 +75,8 @@ void RulerAnnotationActor::selfCalibCb(vtkObject *, unsigned long, void *data) {
     calibrationWidget *w = new calibrationWidget(this, interactor);
     w->exec();
     delete w;
-}
\ No newline at end of file
+}
+
+vtkProp *RulerAnnotationActor::GetProp() {
+    return this;
+}
diff --git a/src/src/Rendering/Measure/RulerAnnotationActor.h b/src/src/Rendering/Measure/RulerAnnotationActor.h
index 9da6268..faf1753 100644
--- a/src/src/Rendering/Measure/RulerAnnotationActor.h
+++ b/src/src/Rendering/Measure/RulerAnnotationActor.h
@@ -14,12 +14,14 @@ class RulerAnnotationActor : public LineAnnotationActor {
 public:
     static RulerAnnotationActor *New();
 
-vtkTypeMacro(RulerAnnotationActor, LineAnnotationActor);
+    vtkTypeMacro(RulerAnnotationActor, LineAnnotationActor);
 
     void BuildShape() override;
 
     NextMeasureMacro(RulerAnnotationActor);
 
+    vtkProp* GetProp() ;
+
     void setCalibration(double s) {
         isCalibration = true;
         calibDistance = s;
diff --git a/src/src/Rendering/Measure/VolRulerAnnotationActor.cpp b/src/src/Rendering/Measure/VolRulerAnnotationActor.cpp
new file mode 100644
index 0000000..992805f
--- /dev/null
+++ b/src/src/Rendering/Measure/VolRulerAnnotationActor.cpp
@@ -0,0 +1,23 @@
+//
+// Created by Krad on 2022/11/23.
+//
+
+#include "VolRulerAnnotationActor.h"
+
+#include <vtkObjectFactory.h>
+#include <vtkPoints.h>
+
+#include "Rendering/Core/ControlPointActor.h"
+
+vtkStandardNewMacro(VolRulerAnnotationActor)
+
+VolRulerAnnotationActor::VolRulerAnnotationActor() {
+    MapMode = MapToWorld;
+    controlP1->SetMapMode(MapToWorld);
+    controlP2->SetMapMode(MapToWorld);
+}
+
+VolRulerAnnotationActor::~VolRulerAnnotationActor() {
+
+}
+
diff --git a/src/src/Rendering/Measure/VolRulerAnnotationActor.h b/src/src/Rendering/Measure/VolRulerAnnotationActor.h
new file mode 100644
index 0000000..ee12a17
--- /dev/null
+++ b/src/src/Rendering/Measure/VolRulerAnnotationActor.h
@@ -0,0 +1,34 @@
+//
+// Created by Krad on 2022/11/23.
+//
+
+#ifndef OMEGAV_VOLRULERANNOTATIONACTOR_H
+#define OMEGAV_VOLRULERANNOTATIONACTOR_H
+
+#include "RulerAnnotationActor.h"
+
+class VolRulerAnnotationActor:public RulerAnnotationActor {
+public:
+    //@{
+    /**
+     * Standard methods for instances of this class.
+     */
+    static VolRulerAnnotationActor *New();
+
+    vtkTypeMacro(VolRulerAnnotationActor, RulerAnnotationActor);
+
+
+protected:
+    VolRulerAnnotationActor();
+
+    ~VolRulerAnnotationActor() override;
+
+public:
+
+private:
+    VolRulerAnnotationActor(const VolRulerAnnotationActor&) = delete;
+    void operator=(const VolRulerAnnotationActor&) = delete;
+};
+
+
+#endif //OMEGAV_VOLRULERANNOTATIONACTOR_H