Stable Morphs Into Racetrack · Zoom Magic

✍️ Editor’s Notes

The original is light on info, but there’s an easy-to-miss instruction buried in it that actually matters — “only the item on the phone changes, the scene stays the same the whole time”. That’s a hard rule for morph-style ad videos: lock the background environment, only let the main prop transform. Without that constraint the model tends to repaint the whole scene and blow the continuity. But the original just tosses that off in one line and leaves every detail for the model to guess at. Flagging need_expanded as true makes total sense — there’s no description of what the stable looks like, no word on the transition texture during the morph. The expansion needed to nail down the dolly zoom’s focal-length change rate, the in-between state from stable to racetrack, and the crowd density in the stands, otherwise you’re rolling the dice on a different result every generation.