## 4 Experiments and Results
### Experimental Results  
#### 4.4.1 Usability and Utility of HybridFilm  
We customized a questionnaire based on a 7-point Likert scale to assess the usability and utility of HybridFilm. The rating descriptions of the questionnaire are presented in Table 2, while Figure 13a and Figure 13b show the average scores for each subject of the usability and utility metrics of HybridFilm, respectively. The ratings shown in Figure 13 reveal that the participants generally agreed on the usability and utility of HybridFilm (average scores \(\geq\) 6.0). Notably, the subjects 'Preview' under Usability and 'Submit', 'Switch', and 'Preview' under Utility received higher levels of approval, with average scores exceeding 6.5. Additionally, we incorporated feedback from retrospective interviews, which are summarized below. Figure 12: Evaluation of the experimental procedure. Groups A and B conducted evaluation experiments, questionnaires, and interviews using HybridFilm and PyMOL Scenes, respectively. The participants found it beneficial to use MR for managing the historical state of digital content on their desktops as it allowed them to commit digital content and restore it to a previous state when needed, as well as view previews between different states. P1 remarked, \"This feature is useful, and I believe 3D content can be better understood using MR than 2D displays.\" P6 noted, \"It was both cool and useful to integrate virtual content with the screen to assist in using the computer.\" The participants also found the system easy to use, with tasks such as submission and switching being relatively straightforward. In comparison with other history tools, the participants offered the following feedback: P4: \"When I use other related history tools, there is only a simple 2D view preview that can only be accessed after switching, which is not very intuitive.\" Another participant stated, P11: \"It requires some learning effort, but once learned, this interaction is easy.\" The participants felt that our system effectively facilitated the observation of changes between two states and the evolution between individual states, enabling them to easily comprehend the temporal relationships that preceded these changes. Regarding the system's applicability, P7 commented, \"The color transformation mechanism is very clever and enables easy observation of the before-and-after relationships between individual states.\" P8 added, \"Using MR provides a clearer view of the structure of the 3D model.\" \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**Category**} & \multirow{2}{*}{**Subject**} & \multicolumn{8}{c}{**Rating Description**} \\ \cline{3-8}  & & **Strongly** & **Disagree** & **Somewhat** & **Disagree** & **Neutral** & **Somewhat** & **Agree** & **Strongly** \\  & & & **Disagree** & **Disagree** & **Neutral** & **Agree** & **Agree** & **Agree** \\ \hline \multirow{3}{*}{Usability} & Submit & 1 & 2 & 3 & 4 & 5 & 6 & 7 \\  & Switch & 1 & 2 & 3 & 4 & 5 & 6 & 7 \\  & Preview & 1 & 2 & 3 & 4 & 5 & 6 & 7 \\ \hline \multirow{3}{*}{Utility} & Submit & 1 & 2 & 3 & 4 & 5 & 6 & 7 \\  & Switch & 1 & 2 & 3 & 4 & 5 & 6 & 7 \\ \cline{1-1}  & Preview & 1 & 2 & 3 & 4 & 5 & 6 & 7 \\ \cline{1-1}  & Change & 1 & 2 & 3 & 4 & 5 & 6 & 7 \\ \cline{1-1}  & Evolution & 1 & 2 & 3 & 4 & 5 & 6 & 7 \\ \cline{1-1}  & Sequential & 1 & 2 & 3 & 4 & 5 & 6 & 7 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Rating descriptions for the usability and utility questionnaire of HybridFilm. Figure 13: Average scores for usability and utility metrics of HybridFilm. (**a**) Subjects of usability; (**b**) subjects of utility. The comments from all the participants were used to construct a word cloud to evaluate the HybridFilm. After removing common stopwords, the comments were classified into three categories: positive feedback, neutral feedback, and negative feedback.