Examples: Fixed NodeMaterial not import error.

[linbingquan]

Related commit: 3f0b691

Description

As the title.

Error info:

webgl_nodes_loader_gltf_sheen.html:71 
        
       Uncaught (in promise) ReferenceError: NodeMaterial is not defined
    at webgl_nodes_loader_gltf_sheen.html:71:24
    at GLTFLoader.js:220:6
    at GLTFLoader.js:2461:5

[mrdoob]

Hmm, shouldn't have the CI failed? 🤔

[linbingquan]

Hmm, shouldn't have the CI failed? 🤔

That's an interesting question.

https://github.com/mrdoob/three.js/actions/runs/4061863540/jobs/6992289842#step:6:42

Diff 4.7% in file: webgl_nodes_loader_gltf_sheen

[mrdoob]

/ping @LeviPesin

[LeviPesin]

5% is just a too large threshold -- I was able to decrease it to 0.3% in #25403.