entityOps.swap

Replace one entity with another entity that already exists in the scene. The replacement is moved into the target's slot — same parent, local position and rotation, the target's scale (keepScale = false opts out) and name (keepName = false opts out) — and the target is removed with its whole subtree.

entityOps.swap("DefaultBody", "my_knight")
entityOps.swap("placeholder_car", "sports_car", { keepName = false })
entityOps.swap("DefaultBody", "my_knight", { dryRun = true })

Both arguments are entity names or ids. dryRun = true reports what would move and what would be removed without mutating.

To replace an entity with a content asset (a bundle/mesh/…) rather than another scene entity, use entityOps.fromAsset (spawn) or appearance.replaceWithContent (in-place slot swap).