diff --git a/OdeWorld.cc b/OdeWorld.cc
index f08a46a..aa49f2e 100644
--- a/OdeWorld.cc
+++ b/OdeWorld.cc
@@ -249,71 +249,73 @@ dGeomID OdeWorld::Object::cloneGeom(dGeomID geom, dBodyID body)
     return id;
 }
 
-bool OdeWorld::Object::addCube(const vector<float> args)
+bool OdeWorld::Object::addCube(refptr< std::vector<float> > args)
 {
-    if (args.size() != 9)
+    if (args->size() != 9)
         return false;
     dGeomID id = dCreateBox(0,
-            m_scale * args[0],
-            m_scale * args[1],
-            m_scale * args[2]);
+            m_scale * (*args)[0],
+            m_scale * (*args)[1],
+            m_scale * (*args)[2]);
     dMass mass;
     dMassSetBox(&mass, 1.0,
-            m_scale * args[0],
-            m_scale * args[1],
-            m_scale * args[2]);
+            m_scale * (*args)[0],
+            m_scale * (*args)[1],
+            m_scale * (*args)[2]);
     setupGeom(id, &mass,
-            args[3], args[4], args[5],
-            args[6], args[7], args[8]);
+            (*args)[3], (*args)[4], (*args)[5],
+            (*args)[6], (*args)[7], (*args)[8]);
     return true;
 }
 
-bool OdeWorld::Object::addSphere(const vector<float> args)
+bool OdeWorld::Object::addSphere(refptr< std::vector<float> > args)
 {
-    if (args.size() != 4)
+    if (args->size() != 4)
         return false;
-    dGeomID id = dCreateSphere(0, m_scale * args[0]);
+    dGeomID id = dCreateSphere(0, m_scale * (*args)[0]);
     dMass mass;
-    dMassSetSphere(&mass, 1.0, m_scale * args[0]);
+    dMassSetSphere(&mass, 1.0, m_scale * (*args)[0]);
     setupGeom(id, &mass,
-            args[1], args[2], args[3],
+            (*args)[1], (*args)[2], (*args)[3],
             0.0, 0.0, 0.0);
     return true;
 }
 
-bool OdeWorld::Object::addCylinder(const vector<float> args)
+bool OdeWorld::Object::addCylinder(refptr< std::vector<float> > args)
 {
-    if (args.size() != 8)
+    if (args->size() != 8)
         return false;
-    dGeomID id = dCreateCylinder(0, m_scale * args[0], m_scale * args[1]);
+    dGeomID id = dCreateCylinder(0, m_scale * (*args)[0], m_scale * (*args)[1]);
     dMass mass;
-    dMassSetCylinder(&mass, 1.0, 3, m_scale * args[0], m_scale * args[1]);
+    dMassSetCylinder(&mass, 1.0, 3, m_scale * (*args)[0], m_scale * (*args)[1]);
     setupGeom(id, &mass,
-            args[2], args[3], args[4],
-            args[5], args[6], args[7]);
+            (*args)[2], (*args)[3], (*args)[4],
+            (*args)[5], (*args)[6], (*args)[7]);
     return true;
 }
 
-bool OdeWorld::Object::addCCylinder(const vector<float> args)
+bool OdeWorld::Object::addCCylinder(refptr< std::vector<float> > args)
 {
-    if (args.size() != 8)
+    if (args->size() != 8)
         return false;
-    dGeomID id = dCreateCCylinder(0, m_scale * args[0], m_scale * args[1]);
+    dGeomID id = dCreateCCylinder(0,
+            m_scale * (*args)[0], m_scale * (*args)[1]);
     dMass mass;
-    dMassSetCappedCylinder(&mass, 1.0, 3, m_scale * args[0], m_scale * args[1]);
+    dMassSetCappedCylinder(&mass, 1.0, 3, m_scale * (*args)[0],
+            m_scale * (*args)[1]);
     setupGeom(id, &mass,
-            args[2], args[3], args[4],
-            args[5], args[6], args[7]);
+            (*args)[2], (*args)[3], (*args)[4],
+            (*args)[5], (*args)[6], (*args)[7]);
     return true;
 }
 
-bool OdeWorld::Object::addPlane(const vector<float> args)
+bool OdeWorld::Object::addPlane(refptr< std::vector<float> > args)
 {
-    if (args.size() != 6)
+    if (args->size() != 6)
         return false;
 
     dMatrix3 r;
-    dRFromEulerAngles(r, args[3], args[4], args[5]);
+    dRFromEulerAngles(r, (*args)[3], (*args)[4], (*args)[5]);
     dVector3 default_plane_direction = {0, 0, 1, 0};
     dVector3 rotated_plane_direction;
     dMultiply0(rotated_plane_direction, default_plane_direction, r, 1, 3, 3);
@@ -321,7 +323,7 @@ bool OdeWorld::Object::addPlane(const vector<float> args)
     float a = rotated_plane_direction[0];
     float b = rotated_plane_direction[1];
     float c = rotated_plane_direction[2];
-    float d = m_scale * (a * args[0] + b * args[1] + c * args[2]);
+    float d = m_scale * (a * (*args)[0] + b * (*args)[1] + c * (*args)[2]);
 
     dGeomID id = dCreatePlane(m_space, a, b, c, d);
     m_geoms.push_back(id);
diff --git a/OdeWorld.h b/OdeWorld.h
index 2377e00..92d06d1 100644
--- a/OdeWorld.h
+++ b/OdeWorld.h
@@ -6,6 +6,7 @@
 #include <vector>
 #include <string>
 #include <map>
+#include "refptr/refptr.h"
 
 class OdeWorld
 {
@@ -28,11 +29,11 @@ class OdeWorld
                 void setRotation(dReal x, dReal y, dReal z);
                 const dReal * getPosition();
                 const dReal * getRotation();
-                bool addCube(const std::vector<float> args);
-                bool addSphere(const std::vector<float> args);
-                bool addCylinder(const std::vector<float> args);
-                bool addCCylinder(const std::vector<float> args);
-                bool addPlane(const std::vector<float> args);
+                bool addCube(refptr< std::vector<float> > args);
+                bool addSphere(refptr< std::vector<float> > args);
+                bool addCylinder(refptr< std::vector<float> > args);
+                bool addCCylinder(refptr< std::vector<float> > args);
+                bool addPlane(refptr< std::vector<float> > args);
                 void addForce(dReal fx, dReal fy, dReal fz);
                 void addRelForce(dReal fx, dReal fy, dReal fz);
                 void addTorque(dReal fx, dReal fy, dReal fz);