How the SpotLight works?

Questions
1

I have a model in my scene.
Now I need to add a SpotLight from the top of the model.
I set the position of both.
But SpotLIght doesn’t light!
I add a helper for SpotLight to figure out what’s happening.

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Positions are right. But I don’t understand what is the problem.
This is how I added my light:

const light3 = new THREE.SpotLight(0xFFFFFF, 2.00, 0, 0.400);
light3.position.set(0, 1000, 0);
light3.name = "top_light";
light3.castShadow = true;
this.scene.add(light3)

const spotLightHelper = new THREE.SpotLightHelper(light3);
this.scene.add(spotLightHelper);

Note: the brightness of the car is because of envMap, not lights.

Thanks for your help.

2

Can you share a live demo with your work of progress so far? Maybe as a git repository?

A lot of things can go wrong here so it’s best to provide some debug possibilities.

3

Thanks for your reply.
I decided don’t use SpotLight at this moment due to the deadline.
So, sharing a repo can’t help so much.
But, what is the difference between adding lights to the camera and the scene?
Does it cause this effect?

4

If you are adding lights to the camera, it is mandatory to add the camera to the scene. Otherwise the lights do have no effect.