Help about model effect download from sketchfab hdr ? shader? light?

Questions
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1

Hi

I’m beginner of three.js.
I download a glTF model from sketchfab
https://sketchfab.com/models/6234171380f14c77b3d89efe973e9fab?ref=related

I load the model with three.js and everything looks very dark
I google some articles and set parameters like this
renderer.gammaFactor = 2.2;
renderer.gammaOutput = true;

I used glTFViewer loader to load the same gltf and everything shows the same.
https://gltf-viewer.donmccurdy.com

I think the problem is about hdr or shader. Any body who can help?? Thanks a lot
my email is 26076920@qq.com

sketchfab effect
sketchfab

glTFViewer effect
gltfViwerTool

my three.js test effect
myThreejsTest

there is project name clay-viewer. This viewer can load the model and shows almost the same as sketchfab but too complicated to me
https://github.com/pissang/clay-viewer

my test html
index.html (3.1 KB)