# Virtual Marker Technique to Enhance User Interactions in a Marker-Based AR System
## 6 Pilot Study
### Results
#### 6.7.3 Interview after Task 2  
In this research, we found that the experimenters showed more understanding and interest in the second task compared to the first task. In task 2, the experimenters were allowed to explore the system freely. Although we did not record the time spent by the experimenters for task 2, we observed that the experimenters could usually complete the task of controlling the car and the character quickly (about two or three minutes each) and that most of the experimenters conducted experiments with different variants, such as generating multiple combined virtual markers to test the movement of the car in different directions. We sorted out the interviews of the experimenters after task 2 and mainly asked the experimenters to describe their feelings and opinions on the control of the car and avatar. **Q1: User experience for car control**  
-It is fun to control the movement of the car with the virtual and the physical markers together. The movement of the car can be realized in real time, which is very intuitive. (P1)  
-Users can adjust the position and angle of the car according to the parameters set by themselves, which is very interesting. I think it will be very convenient in future applications. (P2)  
-Using virtual markers to set spatial location information is more convenient and easy to modify. The moving marker as a physical marker makes the operation more tangible, which makes me feel like I am actually driving. (P3)  
-The user can customize the direction and distance of the car movement, and can operate through the physical marker. I think this is very interesting. (P4)  
-The use of virtual markers is convenient for customizing the parameters of the object in the system. Marker as an entity to control the car is more interactive in physics. (P5)  
**Q2: User experience for avatar control**  
-The animation of avatar uses a physical marker as controller. The operation of the marker can be linked to the virtual avatar very vividly. As a user, it is easy to understand how to operate the avatar. (P1)  
-Users can adjust the size of the avatar through parameters. After connecting the markers with gestures, i can also control the behavior of the avatar, which i think is very straightforward and convenient. (P2)  
-The user can use the marker as the controller of the avatar action, which makes the avatar more vivid. (P3)  
-A physical marker is used to control the actions of the avatar, so that i am more aware of my operations. (P4)  
-The marker supports passing parameters to avatar functions. At the same time, the object performs a series of actions in the real scene, so that we can experience a more intuitive effect in the system. (P5)  
**Q3: User experience for using virtual marker**  
-The virtual marker extends the function of the marker. The user can customize the parameters of the virtual marker. The interactive functions of the system have also been expanded. (P1)  
-The virtual marker makes the system functions richer and easier to interact. (P2)-The virtual markers can be used to effectively control the parameters, and it is easy to be used in scenarios where parameter changes are required. (P3)  
-The process of creating and modifying virtual markers is controlled by gestures, which is natural and intuitive. This allows me to focus on the functions and variables that need to be changed, which helps me sort out the logic. (P4)  
-Controlling the parameters makes it very logical and intuitive to associate with functions and objects. (P5)  
In the interview, three experimenters clearly stated that the virtual marker technique expands the function of the system and can effectively control the parameter information. Two experimenters said that after the introduction of virtual markers, the logical relationship between the markers is very clear and intuitive. Based on the above, we believe that virtual marker technique can effectively expand the functions of the system and help users more clearly understand the connection and logic between the markers.