使用tween.js绕世界轴旋转对象 [英] Rotate object around world axis with tween.js

问题描述

我想使用补间在世界轴上旋转一个多维数据集。我能够通过使用补间在世界轴上旋转该多维数据集而无需使用补间

I want to rotate a cube on world axis by using tween.I am able to rotate the cube around world axis without using tween by using

rotateAroundWorldAxis(cube[1], new THREE.Vector3(0,1,0),degreeToRadians(90)); 

但是我想慢慢进行，所以我想在补间中使用它。

but I want to happen this slowly so I want to use it with tween.

我正在使用

var start = {x:cube[1].rotation.x, y:cube[1].rotation.y,    z:cube[1].rotation.z};
var end = {x:cube[1].rotation.x , y:cube[1].rotation.y+degreeToRadians(90) ,
          z:cube[1].rotation.z};

var tween = new TWEEN.Tween(start)
  .to(end, 1000)
  .easing( TWEEN.Easing.Exponential.InOut )
  .onUpdate(function(){
     cube[1].rotation.x = this.x;
     cube[1].rotation.y = this.y;
     cube[1].rotation.z = this.z;
   })
.start()

之前，但是它绕对象轴旋转了多维数据集。因此，我切换到

before, but it was rotating the cube around object axis.So,I switched to

rotateAroundWorldAxis(cube[1], new THREE.Vector3(0,1,0),degreeToRadians(90));

但是如何在补间中使用它？

but how to use it with tween?

推荐答案

您可以使用补间将通用值从0更改为90，然后在更新中使用rotateAroundWorldAxis函数

You can use tween to change a generic value from 0 to 90 and then in the update use the rotateAroundWorldAxis function

var cubeAngle = 0; // use this global variable if you want to rotate more than one time

一次以上，请使用此全局变量>

in tween initialization

var start = {angle: cubeAngle};
var end = {angle: cubeAngle + 90};

在onUpdate

cubeAngle=this.angle;    
rotateAroundWorldAxis(cube[1], new THREE.Vector3(0,1,0),degreeToRadians(cubeAngle));

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