three.js显示中文字体与tween应用详析

let vertices1 = new THREE.PlaneGeometry(1400, 900, 13, 6).vertices;

d.position.clone().add(Vector3(0, 0, 1)) //这里的d.position就是每个点的位置

let vertices2 = new THREE.SphereGeometry(500, 12, 9).vertices;

for(let i=0; i<98; i++) {
 let x = Math.sin(Math.PI / 12 * i) * 400;
 let y = (49 - i) * 8;
 let z = Math.cos(Math.PI / 12 * i) * 400;
 positions3.push(new THREE.Vector3(x,y,z));
}

new THREE.Vector3(0, d.position.y, 0) //d.position.y就是点的y坐标

initTween() {
 var pos = { time: 0 };
 tween1 = new TWEEN.Tween(pos).to({ time: 1 }, 1000);
 tween2 = new TWEEN.Tween(pos).to({ time: 2 }, 1000);
 tween3 = new TWEEN.Tween(pos).to({ time: 0 }, 1000);
 tween1.easing(TWEEN.Easing.Linear.None);
 tween2.easing(TWEEN.Easing.Linear.None);
 tween3.easing(TWEEN.Easing.Linear.None);
 tween1.onUpdate(onUpdate);
 tween2.onUpdate(onUpdate);
 tween3.onUpdate(onUpdate);
}

function onUpdate() {
 let time = this._object.time; //动画时刻值
 if(flag == 0) {//这里有三段动画flag判断是那一段动画
 group.children.forEach((d, i) => {//group里面包含着所有文字网格
  d.position.copy(positions3[i].clone().multiplyScalar(time / 2).add(positions1[i].clone().multiplyScalar(1 - time / 2)));
  d.lookAt((new THREE.Vector3(0, d.position.y, 0).multiplyScalar(time / 2)).add(d.position.clone().add(lookAt1).multiplyScalar(1 - time / 2)));
 })
 } else if(flag == 1) {
 group.children.forEach((d, i) => {
  d.position.copy(positions1[i].clone().multiplyScalar(1 - time).add(positions2[i].clone().multiplyScalar(time)));
  d.lookAt((d.position.clone().add(lookAt1).multiplyScalar(1 - time)).add(lookAt2.multiplyScalar(time)));
 })
 } else if(flag == 2) {
 group.children.forEach((d, i) => {
  d.position.copy(positions2[i].clone().multiplyScalar(2 - time).add(positions3[i].clone().multiplyScalar(time - 1)));
  d.lookAt((lookAt2.multiplyScalar(2 - time)).add(new THREE.Vector3(0, d.position.y, 0).multiplyScalar(time - 1)));
 })
 }
}

click() {
 tween1.stop();
 tween2.stop();
 tween3.stop();
 if(flag == 0) {
 tween1.start();
 } else if(flag == 1) {
 tween2.start();
 } else if(flag == 2) {
 tween3.start();
 }
 flag = (flag + 1) % 3;
},