Motivation
Camera following
CaR follows the path as well as we do. The other four models are clearly worse.
Table 1: Camera following by system (five rollout seeds; direction agreement, correlation with the prescribed yaw, implied FOV).
| system | direction | correlation | implied FOV (target 90°) |
|---|---|---|---|
| Memorizon 100 / 200 / 400 s | 0.987 / 0.986 / 0.986 | 0.956 / 0.958 / 0.955 | 90.4 / 90.2 / 90.2 |
| CaR | 0.990 | 0.959 | 60.2 |
| LingBot-World-v2 | 0.976 | 0.879 | 72.5 |
| Matrix-Game 3.0 | 0.971 | 0.866 | 98.1 |
| Infinite-World | 0.961 | 0.888 | 108.6 |
| DreamX-World 1.0 | 0.952 | 0.815 | 133.4 |
| HY-World 1.5 | 0.906 | 0.696 | 123.6 |
CaR's 60° implied FOV points to a narrower camera, not a worse path. First 60 s, five rollout seeds.
Examples
Four scenes from the project page, 60 s each, same first frame and camera path for every method. Memorizon is the 100 s model (the project-page model); the other six are the compared systems.
Same first frame and camera path, first 30 s, one rollout seed.
Suburb corner
Residential road
Tree-lined avenue
Residential street
Returns at matched yaw error
Among well-aligned returns, CaR ties Memorizon 100 / 400 s and trails 200 s by about 0.06 Revisit.
Table 2: Return quality (Revisit, mean over five seeds) and Gain over the no-bank control, by system.
| system | Revisit (mean ± seed std) | Gain | pairs |
|---|---|---|---|
| Memorizon 100 s | 0.441 ± 0.018 | 0.305 | 536 |
| Memorizon 200 s | 0.483 ± 0.010 | 0.361 | 457 |
| Memorizon 400 s | 0.435 ± 0.022 | 0.310 | 443 |
| CaR | 0.425 ± 0.016 | 0.289 | 592 |
| HY-World 1.5 | 0.329 ± 0.039 | 0.146 | 92 |
| Matrix-Game 3.0 | 0.302 ± 0.043 | 0.104 | 108 |
| Infinite-World | 0.275 ± 0.026 | 0.164 | 140 |
| LingBot-World-v2 | 0.163 ± 0.032 | 0.006 | 55 |
| DreamX-World 1.0 | 0.139 ± 0.039 | 0.029 | 113 |
Returns with yaw error ≤ 10°, each video calibrated to the prescribed turn amplitude. Yaw comes from phase correlation on the generated video: it sees rotation, not translation.
- Most returns of the other systems fall above 25° error, the confound the reviewer raised.
Conclusion
- CaR follows the path as well as Memorizon (correlation 0.959 vs 0.955–0.958); its 60° implied FOV points to a narrower camera.
- At matched yaw error CaR is within seed noise of Memorizon 100 / 400 s (0.425 vs 0.441 / 0.435) and 0.06 Revisit below 200 s (0.483). HY-World, Matrix-Game, Infinite-World, LingBot and DreamX stay far lower.
- What changes in the paper: camera following moves into Sec. 4.2; the cross-system ranking is called indicative; within-backbone ablations are the primary evidence for memory; no advantage over CaR in camera following is claimed (the two follow the path equally well).