three.js/editor/js/commands/SetMaterialCommand.js

import { Command } from '../Command.js';
import { ObjectLoader } from '../../../build/three.module.js';

/**
 * @param editor Editor
 * @param object THREE.Object3D
 * @param newMaterial THREE.Material
 * @constructor
 */
class SetMaterialCommand extends Command {

	constructor( editor, object, newMaterial, materialSlot ) {

		super( editor );

		this.type = 'SetMaterialCommand';
		this.name = 'New Material';

		this.object = object;
		this.materialSlot = materialSlot;

		this.oldMaterial = this.editor.getObjectMaterial( object, materialSlot );
		this.newMaterial = newMaterial;

	}

	execute() {

		this.editor.setObjectMaterial( this.object, this.materialSlot, this.newMaterial );
		this.editor.signals.materialChanged.dispatch( this.newMaterial );

	}

	undo() {

		this.editor.setObjectMaterial( this.object, this.materialSlot, this.oldMaterial );
		this.editor.signals.materialChanged.dispatch( this.oldMaterial );

	}

	toJSON() {

		const output = super.toJSON( this );

		output.objectUuid = this.object.uuid;
		output.oldMaterial = this.oldMaterial.toJSON();
		output.newMaterial = this.newMaterial.toJSON();

		return output;

	}

	fromJSON( json ) {

		super.fromJSON( json );

		this.object = this.editor.objectByUuid( json.objectUuid );
		this.oldMaterial = parseMaterial( json.oldMaterial );
		this.newMaterial = parseMaterial( json.newMaterial );

		function parseMaterial( json ) {

			const loader = new ObjectLoader();
			const images = loader.parseImages( json.images );
			const textures = loader.parseTextures( json.textures, images );
			const materials = loader.parseMaterials( [ json ], textures );
			return materials[ json.uuid ];

		}

	}

}

export { SetMaterialCommand };