Sharing a helpful solution for a recent problem I faced in case it can assist someone else.
Imagine you have a House object with a Chair inside it positioned in a particular spot. If you scale the House's size by 2, the Chair will no longer be in the same relative location inside the House. To reposition the Chair to its original spot without manual adjustment, follow these steps.
UPDATE: Solution has been relocated to an answer.
Here is the equation to calculate it: (Chair's position multiplied by House's scale factor) minus (House's position multiplied by (House's scale factor minus 1))
In a Threejs scenario, the code might resemble the following:
const scaleFactor = 2;
house.scale.setScalar(scaleFactor);
chair.position.set(
(chair.position.x * scaleFactor) - (house.position.x * (scaleFactor - 1)),
(chair.position.y * scaleFactor) - (house.position.y * (scaleFactor - 1)),
(chair.position.z * scaleFactor) - (house.position.z * (scaleFactor - 1))
);
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