The dispose() method of the SpotLight class in the Three.js library is used to free the memory used by the spotlight object. It removes the spotlight from the scene, clears its references and disposes all of its internal resources.
spotlight.dispose();
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The SpotLight class implements a spotlight that illuminates the scene with a cone of light that radiates from a point in a specific direction. The spotlight needs to be added to the scene using the add() method, and can be removed using the remove() method.
When a spotlight is no longer needed, it should be disposed of using the dispose() method. This method removes the spotlight from the scene, clears its references and disposes all of its internal resources. This frees up the memory used by the spotlight object and ensures that there are no memory leaks or performance issues.
const scene = new THREE.Scene();
const spotlight = new THREE.SpotLight(0xffffff, 1, 100, Math.PI / 4, 0.6);
spotlight.position.set(1, 0, 0);
scene.add(spotlight);
// ... rendering and animation code ...
// When the spotlight is no longer needed, dispose of it.
spotlight.dispose();
In the above example, a SpotLight object is created and added to the scene using the add() method. When the spotlight is no longer needed, it is disposed of using the dispose() method.
Disposing a spotlight will not remove any references to it in other objects or variables. It is the responsibility of the developer to ensure that all references to the spotlight are removed.
Disposing a spotlight will also dispose of any associated shadows that were created using the SpotLightShadow class.
It is not necessary to dispose of a spotlight if it is removed from the scene using the remove() method.