I have some questions
If comment code : height: 0.
you will find that you get a polygon of different colors, which only changes a height, and the default value of height is 0（ At least that’s what the API documentation describes)
2：The polygon in the example will appear or disappear randomly with the distance of the camera. I know the way to prevent this is to set a height attribute to the polygon, but this will lead to material changes.