a mysterious light, i don't know how to close it

[fanchen4139]

I turned off all the lights, but there's still a mysterious light source. It reflects a metallic light at a certain angle. If you know how to control it, please tell me.

viewer.scene.globe.enableLighting = false;
viewer.shadows = false;
viewer.scene.sun.show=false;
viewer.scene.moon.show=false;
viewer.scene.skyAtmosphere.show=false;
viewer.scene.fog.enable=false;

[fanchen4139]

first photo is forward to south, second photo is forward to north.