Guide one ball around a curved track with visible wall contact

Original, untested video brief. No input image or generated result is supplied.

1. Task and boundary

Follow one ball rolling into and around a banked curve on a fixed tabletop track. Keep the ball supported by the track floor while it travels beside the outer wall and changes direction. The curved contact boundary must remain readable through the turn. End as the ball enters the outgoing section, so the completed direction change can be seen without inventing an abrupt stop.

This original shot plan is untested. Use one broad, smooth curve with an outer wall and enough width to distinguish the ball from both edges. Exclude jumps, collisions with other balls, loops, speed records and numerical force explanations. The visible target is a continuous supported turn, not proof of ideal rolling without slip.

2. Authorized first frame

Use a photograph or accurate drawing you own or have permission to use. Show one striped ball already released at the entrance to a curved channel, with a readable outer wall and a visible outgoing section. Keep the entire bend inside the frame. There is no hand or hidden object waiting to redirect the ball.

Choose an elevated three-quarter view that shows the track floor beside the ball and the wall contour ahead of it. A few fixed surface details help identify the path. Avoid an overhead angle that hides the wall height or a low angle that hides the far half of the bend.

3. Use the generator

Open the current image-to-video generator in a mode accepting your authorized first frame. Paste the complete prompt, check the available settings and cost estimate, then submit only when ready. This page supplies text; it does not upload an image or start a generation.

4. Prompt and timing

Start from my authorized image of one striped ball already released at the entrance to a fixed curved track with a banked outer wall. Lock the camera, tabletop and track. Let the same ball roll forward into the curve, remain supported by its floor and follow the inside face of the outer wall through the bend. Change the travel direction continuously along that curved boundary. Keep the visible ball-to-wall relation readable rather than moving the wall to meet the ball. Let the original stripe rotate on the ball as it travels, without becoming a second ball or a painted track mark. Preserve the ball size and both track edges. Continue out of the bend onto the existing outgoing section, still supported by the track. No airborne shortcut, bounce, wall penetration, teleport across the curve, rotating track, added hand, camera tracking, cut or speed label. End while the ball is moving along the outgoing direction; do not freeze it in the middle of the bend.

Opening: identify the incoming direction, outer wall and existing outgoing route before the ball enters the main bend.
Middle: inspect early, middle and late positions against the same wall; track both the ball contour and its rotating stripe.
Ending: retain a short outgoing interval so the new travel direction is visible after the curved contact sequence.

These beats are author suggestions, not exact model timing guarantees. Adapt their proportions to the clip length actually available.

5. Inspect the output

After inspecting your own output, record a time or frame, visible observation and pass, fail or inconclusive judgment for each condition. A convincing ending alone does not verify the preceding action.

The same ball enters, traverses and leaves the original curve without an unexplained position jump.
The outer wall and track floor stay fixed relative to the table.
The ball remains within the channel, with no airborne shortcut or passage through the outer wall.
Its direction changes gradually along the curve while the visible wall relation remains continuous.
The stripe rotates on the ball and does not detach, multiply or stick to the background.
The outgoing path follows the existing exit rather than a newly generated track.
If the wall-contact interval is hidden, mark the contact-guided turn inconclusive.

6. Fix one failure

The ball cuts across the bend: emphasize the existing outer-wall route and keep the full curved boundary visible.
The wall bends around the ball: anchor the track edges to fixed table details.
The ball hops: reduce the requested speed and remove launch, leap or impact language.
The stripe stays motionless: tie it to the ball surface and inspect several positions, without demanding a measured angular rate.
The outgoing route changes: include the full exit in the first frame and preserve its edges.

7. Ending and limits

End with the original ball moving into the existing outgoing channel after a continuous supported turn.

Save your own generated result through the available result controls, together with the authorized input, exact prompt, settings and inspection notes.

No generated clip, track experiment, friction coefficient or force calculation is supplied. A visible stripe and curved path do not establish exact rolling speed or prove that no slip occurred. Obscured support relations remain unverified.

The cylinder-roll task couples rotation and translation on a surface. The two-bounce task separates the ball from its support after impacts. This task adds a fixed curved side boundary and reviews direction change while support is retained.