three.js 导入模型合并为一个

导入的模型文件是个组,里面有多个模型,需要合并为一个,方便操作

参考文章

https://blog.csdn.net/weixin_52125363/article/details/122454894

https://blog.csdn.net/u012483043/article/details/106465465/

https://zhuanlan.zhihu.com/p/467005893

const objLoader = new OBJLoader()
	objLoader.load(
		"./YUN.obj",
		function(obj){
			// objObject = obj
			// console.log(objObject)
			// objObject.children[0].material.color.set(0xCB672E)
			// objObject.scale.set(0.1,0.1,0.1)
			// objObject.position.set(1.3,0.3,1.3)
			// scene.add(objObject)
			obj.position.set(1.3,0.3,1.3)
			scene.add(merge(obj))
		},
		function ( xhr ) {
			console.log( 'obj-' + ( xhr.loaded / xhr.total * 100 ) + '% loaded' );
		},
		// called when loading has errors
		function ( error ) {
			console.log( 'obj加载失败',error );
		}
	)

function merge(object) {
		const geometries = [];
		const matArr = [];
		var meshs = new THREE.BufferGeometry();
		object.traverse((obj) => {
			const child = obj;
			if (child.isMesh) {
				const geo = child.geometry.clone();
				if (Array.isArray(child.material)) {
					child.material = child.material[0];
				}
				matArr.push(child.material);
				geo.index = null;
				child.updateWorldMatrix(true, true);
				geo.applyMatrix4(child.matrixWorld);
				geometries.push(geo);
			}
		});
		// for(var i=0; i<geometries.length; i++){
		// 	meshs.merge(new THREE.BufferGeometry().fromBufferGeometry( geometries[i] ), new THREE.BufferGeometry().fromBufferGeometry( geometries[i] ).matrix, i);
		// }
		// var buffermeshs = new THREE.BufferGeometry().fromGeometry(meshs);
		// const result = new THREE.Mesh(buffermeshs,matArr);
		// console.log(result)
		//合并几何体
		const mergedGeometries = BufferGeometryUtils.mergeBufferGeometries(geometries, true);
		//创建网格
		const singleMergeMesh = new THREE.Mesh(mergedGeometries, matArr);
		return singleMergeMesh;
	}