remove unneeded code

[vincentfretin]

You don't need to create an AnimationMixer to get the animation clip, it's right there gltf.animations[0] is an AnimationClip object.

[vincentfretin]

You could also add each loaded animation in the objectMesh.animations array and verify if you already have the animation in the array before loading it. Iterating on objectMesh.animations and checking animationClip.name is one way to do it.