How do I set the surface material for the style of an object in the geometrylayer

[yangcumtb]

How do I load a local json file in my application in the format of geojson features？
This is an example of GeoJSON to 3D objects in the sample：

I noticed that he only set the fill color of the style, but did not set the surface material of the object. How can I achieve this effect?

If I don't assign a value to fill.color in style, it defaults to this

Should this surface effect be the default material effect for three? If so, is there a way to use ThreeJS to update surface material for better visualization?

[jailln]

Hi, can you provide a jsfiddle with your code please ?