@babylonjs/core/Animations/animation.optimizations.js

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/**
 * This is a destructive optimization that merges all animatables into the first one.
 * That animatable will also host all the runtime animations.
 * We expect that all the animatables are on the same timeframe (same start, end, loop, etc..)
 * @param scene defines the scene to optimize
 * @param options defines the optimization options
 */
export function OptimizeAnimations(scene, options = {}) {
    const mergeRuntimeAnimations = options.mergeRuntimeAnimations ?? true;
    const mergeKeyFrames = options.mergeRuntimeAnimations === true ? (options.mergeKeyFrames ?? false) : false;
    // We will go through all the current animatables and merge them
    const animatables = scene.animatables;
    if (animatables.length === 0) {
        return;
    }
    const mainAnimatable = animatables[0];
    for (let i = 1; i < animatables.length; i++) {
        const animatable = animatables[i];
        // Merge the current animatable with the main one
        mainAnimatable._runtimeAnimations.push(...animatable._runtimeAnimations);
    }
    if (mergeRuntimeAnimations && mainAnimatable._runtimeAnimations.length > 1) {
        // Make sure only one runtime animation is driving the beat
        const mainRuntimeAnimation = mainAnimatable._runtimeAnimations[0];
        for (let i = 1; i < mainAnimatable._runtimeAnimations.length; i++) {
            const runtimeAnimation = mainAnimatable._runtimeAnimations[i];
            runtimeAnimation._coreRuntimeAnimation = mainRuntimeAnimation;
        }
    }
    if (mergeKeyFrames && mainAnimatable._runtimeAnimations.length > 1) {
        // Merge the keyframes from all the runtime animations into the first one
        const mainAnimation = mainAnimatable._runtimeAnimations[0]._animation;
        for (let i = 1; i < mainAnimatable._runtimeAnimations.length; i++) {
            const runtimeAnimation = mainAnimatable._runtimeAnimations[i];
            const animation = runtimeAnimation._animation;
            animation._coreAnimation = mainAnimation;
        }
    }
    scene._activeAnimatables = [mainAnimatable];
}
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