resample

Resample AnimationChannels, losslessly deduplicating keyframes to reduce file size. Duplicate keyframes are commonly present in animation 'baked' by the authoring software to apply IK constraints or other software-specific features.

Optionally, a WebAssembly implementation from the keyframe-resample library may be provided. The WebAssembly version is usually much faster at processing large animation sequences, but may not be compatible with all runtimes and JavaScript build tools.

Result: (0,0,0,0,1,1,1,0,0,0,0,0,0,0) → (0,0,1,1,0,0)

Example:

import { resample } from '@gltf-transform/functions';
import { ready, resample as resampleWASM } from 'keyframe-resample';

// JavaScript (slower)
await document.transform(resample());

// WebAssembly (faster)
await document.transform(resample({ ready, resample: resampleWASM }));