constructor( parser ) {

    		this.parser = parser;
    		this.name = EXTENSIONS.KHR_LIGHTS_PUNCTUAL;

    		// Object3D instance caches
    		this.cache = { refs: {}, uses: {} };

    	}
Punctual Lights Extension

Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_lights_punctual