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The generated camera does not need to reproduce the exact viewpoint of the reference sequence. |
Minor framing differences should not be heavily penalized if they do not interfere with understanding the major mechanical structure and motion. |
If camera problems prevent important structural elements from being observed, the Visual Structure score should be lowered. |
### G. Overall Structural Coherence |
* Does the generated result form a complete mechanical device? |
* Do the different components structurally form a unified system? |
* Are there many isolated, floating, or mechanically disconnected components? |
* Is the core mechanical structure capable of supporting the mechanical function demonstrated by the reference? |
This criterion focuses on whether the components actually form a complete machine, rather than merely checking whether individual reference components appear somewhere in the generated result. |
If a structural error further prevents subsequent mechanical motion from occurring, evaluate the structural error under Visual Structure. If the generated sequence also visibly exhibits the resulting motion failure, the Mechanical Motion score should also be lowered. |
### H. Visual Quality |
Evaluate the visual and rendering quality of the generated frames. |
Consider: |
* Are component edges clear and stable? |
* Are there obvious jagged edges, aliasing, blur, or abnormal boundaries? |
* Do moving objects exhibit severe visual artifacts, smearing, broken geometry, or abnormal deformation? |
* Are materials, lighting, and rendering sufficient to clearly distinguish different mechanical components? |
* Are there obvious rendering errors, missing surfaces, abnormal dark regions, or other visual artifacts? |
* Is the overall image quality sufficiently clear for the mechanical structure and motion to be reliably observed? |
Visual Quality primarily evaluates rendering clarity and observability. |
Photorealism is not required, and differences in visual style from the reference should not by themselves be penalized. |
### Visual Structure Score (0–10) |
**10** = The mechanical structure is complete and fully correct, with all major components fully visible in the frame. Geometry, topology, connectivity, and spatial relationships closely match the reference. Camera placement, materials, lighting, shadows, and 3D presentation are excellent, with no noticeable structural... |
**9** = The mechanical structure is fully correct and all major components are fully visible. Only very minor shortcomings exist in aesthetics, lighting, materials, 3D presentation, or camera placement, while the overall visual quality remains excellent. |
**8** = The mechanical structure is fully correct and all major components are fully visible, but the visual presentation is relatively ordinary, with minor limitations in aesthetics, lighting, materials, 3D appearance, or camera presentation. **A structurally correct result without high-quality visual presentation sho... |
**7** = The mechanical structure and physical relationships are correct, with no substantive issues such as interpenetration, incorrect connections, or incorrect engagement. However, there are a few noticeable issues in rendering, materials, transparency, lighting, 3D appearance, or camera presentation. |
**6** = The mechanical structure and physical relationships remain correct, but visual-quality problems are more frequent or noticeable, such as transparency, fading, rendering artifacts, abnormal materials, flattened 3D appearance, or poor camera presentation. **Scores of 6 or above should not contain clear mechanical... |
**5** = The overall structure is mostly correct, but a small number of clear mechanical or physical errors appear, such as 1–2 local cases of interpenetration, incorrect connections, failed engagement, or implausible mechanical relationships, or such errors appear only in a few frames. This also includes slight croppin... |
**4** = Mechanical or physical errors become more frequent or substantial, such as multiple cases of interpenetration, incorrect connections, failed engagement, or implausible mechanical relationships. Alternatively, framing is substantially incomplete, with one or more important components significantly cropped or occ... |
**3** = Severe structural or physical errors are widespread. Multiple components may be visibly interpenetrating, misaligned, disconnected, or incomplete, or the component modeling, mechanical topology, or connectivity itself is clearly incorrect, preventing the result from forming a reliable complete mechanical system... |
**2** = Most of the mechanical structure contains severe problems. Many major components are missing, severely malformed, misplaced, disconnected, or unobservable, with only limited structure corresponding to the reference. |
**1** = Only minimal recognizable structure related to the reference remains. Most major components and mechanical relationships are missing or severely incorrect, and the result largely fails to form a meaningful mechanical device. |
**0** = No meaningful valid mechanical structure corresponding to the reference is present or observable. |
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2. MECHANICAL MOTION |
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Mechanical Motion evaluates whether the complete dynamic execution of the generated mechanical system is correct, including motion patterns, kinematic relationships, dynamic connectivity, mechanical interactions, dynamic geometric consistency, temporal progression, and motion completeness. |
You must carefully inspect every generated frame and the changes across the entire generated sequence. Do not judge the motion based only on one or a few frames that appear correct. |
If earlier frames appear correct but any later frame shows penetration, component separation, incorrect interaction, abnormal positioning, or another mechanical failure, these failures must be reflected in the Mechanical Motion score. |
### A. Mechanical System Executability |
This criterion focuses on whether the generated result behaves as a complete mechanical system in execution, rather than as a collection of isolated components that happen to move independently. |
If the major generated components do not form a complete mechanical system—for example, wheels, rods, gears, or other components remain isolated and lack the necessary connections or mechanical relationships required to realize the target mechanical behavior—then independent rotation, translation, or animation of those... |
In such cases, the Mechanical Motion score should be extremely low. |
Distinguish between: |
* coordinated motion of multiple components as part of a complete mechanical device through meaningful mechanical relationships; |
and |
* independent motion of isolated components that lack the necessary mechanical relationships. |
Only the former should be considered valid mechanical-system execution. |
If a severe structural error identified under Visual Structure further causes the actual mechanical execution to fail, the Mechanical Motion score should also be lowered accordingly. |
### B. Motion Pattern and Functional Consistency |
Evaluate whether the generated components realize the same or a mechanically equivalent core motion pattern and mechanical function as the reference, rather than requiring identical absolute motion directions. |
Consider: |
* Are rotation, translation, swinging, reciprocating motion, or other motion types consistent with the intended mechanical function? |
* Are the motion ranges and amplitudes sufficient to perform the corresponding mechanical function? |
* Are the relative motion relationships between components consistent with the reference mechanism? |
* Does the overall motion produce the same or a mechanically equivalent functional result as the reference? |
Do not penalize differences in absolute motion direction by themselves. |
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