core: fix init of ConvexBase

src/shape/geometric_shapes.cpp

@@ -60,7 +60,6 @@ void ConvexBase::set(bool own_storage_, Vec3f* points_, unsigned int num_points_
 
 ConvexBase::ConvexBase(const ConvexBase& other) :
   ShapeBase    (other),
-  points       (other.points),
   num_points   (other.num_points),
   center       (other.center),
   own_storage_ (other.own_storage_)
@@ -73,6 +72,8 @@ ConvexBase::ConvexBase(const ConvexBase& other) :
     points = new Vec3f[num_points];
     memcpy((void*)points, other.points, sizeof(Vec3f) * num_points);
   }
+  else
+    points = other.points;
 
   neighbors = new Neighbors[num_points];
   memcpy(neighbors, other.neighbors, sizeof(Neighbors) * num_points);