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


I’m beginner of three.js.
I download a glTF model from sketchfab

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.

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

sketchfab effect

glTFViewer effect

my three.js test effect

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

my test html
index.html (3.1 KB)