useUpdate

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useUpdate(callback, dependencies, (optionalRef = undefined));

When objects need to be updated imperatively.

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import { useUpdate } from "react-three-fiber";
const ref = useUpdate(
  (geometry) => {
    geometry.addAttribute("position", getVertices(x, y, z));
    geometry.attributes.position.needsUpdate = true;
  },
  [x, y, z] // execute only if these properties change
);
return <bufferGeometry ref={ref} />;