lingo3d/lib/memo/positionChanged.js

Lingo3D is a React/Vue 3d game development framework that ships with a complete visual editor

import getWorldPosition from "./getWorldPosition";
import computePerFrame from "./utils/computePerFrame";
const positionCache = new WeakMap();
export const positionChanged = computePerFrame((target) => {
    const position = getWorldPosition(target);
    const positionOld = positionCache.get(target);
    const result = positionOld ? !position.equals(positionOld) : true;
    positionCache.set(target, position);
    return result;
});
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