Object swap: change one thing, keep the whole shot

What object swap does

Object swap is the point-edit side of Genjutsu. One element of your clip is replaced and everything else survives: the framing, the lighting, the performer's motion, the cut. Swap the bottle on the table, the jacket on the model, the sign above the store - and leave the shot itself alone.

Where motion transfer rebuilds the entire world of the shot, object swap changes exactly one thing. That focus is what makes it reliable: there is less to regenerate, so less can drift.

Object swap vs motion transfer

• Object swap: one element changes, the original frame survives. Use it when a single thing is wrong - the product, the outfit, the signage.
• Motion transfer: the whole scene is rebuilt from references. Use it when the shot is right but the cast, location or entire look should be different.
• Rule of thumb: if you would fix it with a patch, use object swap; if you would reshoot it, use motion transfer.

What people swap most

• Products: one performing take becomes a variant for every SKU, flavour or colourway.
• Wardrobe: alt cuts with a different jacket, dress or pair of shoes, same performance.
• Signage and screens: localise a storefront, billboard or phone screen for another market.
• Props: tools, dishes, gadgets - anything a hand reaches for or sets down.
• Set details: a lamp, a plant or a poster in the background that is wrong for the story.

How to prompt an object swap

A swap prompt has three parts: the one thing that changes, what to use instead, and what must stay. Keep it to a single change per run - the moment you change two, it becomes a partial restage and motion transfer serves you better.

Prep that makes swaps clean

• Keep the camera steady and the object unoccluded for the moment that matters.
• Trim to a window where hands are not covering the object and motion blur is low.
• Give the reference 2 to 4 clean angles; if a label matters, include a legible shot of it.
• Keep the clip short - a single moment of the swap is easier to review than a 30-second pass.

Where swaps fail, and the fix

• Reflective or transparent objects drift: add a reference that shows how edges and highlights should read.
• Hands passing in front: trim to the cleanest window, or recut so the swap happens while the object sits still.
• Tiny text on packaging smears: regenerate with a tighter reference, or keep a clean blank label and add the text in your editor.
• Two changes at once: split into two runs, or step up to motion transfer and rebuild the scene properly.

Step by step, from clip to swapped shot

• Upload the source clip and switch the generator to Object Swap.
• Attach the reference images for the replacement part only.
• Write the three-part prompt, or build it with the prompt generator.
• Check the credit cost shown, run, and review the object at full size before you download.

Where teams use object swap every week

• Performance ads: creative variants without a second shoot day.
• E-commerce: same model, same motion, every colourway.
• Localisation: a market-specific sign in an otherwise identical hero clip.
• Post fixes: a wrong prop caught after the shoot, corrected without a reshoot.