如何在ARCore Sceneform中旋转动画以使节点旋转 [英] How to rotate animate the rotation of a Node in ARCore Sceneform

问题描述

我了解ARCore尚不支持步行等3D动画，但是如何为Node的旋转设置动画?

I understand that 3D animations such as walking are not yet supported in ARCore, but how can I animate the rotation of a Node?

我知道我可以设置LocalRotation或WorldRotation，但是如何使这种动画以流畅的方式连续播放呢?

I know I can set LocalRotation or WorldRotation but how do I make this animated continuously in a smooth fashion?

推荐答案

最简单的方法是使用 Android属性动画.例如，在Sceneform示例太阳能系统"中.看看

The easiest way is to use the Android Property Animation. An example of doing this is in the Sceneform sample "Solar System". Take a look at RotatingNode. This rotates the node around its axis.

首先，它创建一个 ObjectAnimator ，该对象使用LinearInterpolation来设置绕一个圆点4点.

First, it creates an ObjectAnimator that uses LinearInterpolation to set the rotation between 4 points around a circle.

private static ObjectAnimator createAnimator() {
    // Node's setLocalRotation method accepts Quaternions as parameters.
    // First, set up orientations that will animate a circle.
    Quaternion orientation1 = Quaternion.axisAngle(new Vector3(0.0f, 1.0f, 0.0f), 0);
    Quaternion orientation2 = Quaternion.axisAngle(new Vector3(0.0f, 1.0f, 0.0f), 120);
    Quaternion orientation3 = Quaternion.axisAngle(new Vector3(0.0f, 1.0f, 0.0f), 240);
    Quaternion orientation4 = Quaternion.axisAngle(new Vector3(0.0f, 1.0f, 0.0f), 360);

    ObjectAnimator orbitAnimation = new ObjectAnimator();
    orbitAnimation.setObjectValues(orientation1, orientation2, orientation3, orientation4);

    // Next, give it the localRotation property.
    orbitAnimation.setPropertyName("localRotation");

    // Use Sceneform's QuaternionEvaluator.
    orbitAnimation.setEvaluator(new QuaternionEvaluator());

    //  Allow orbitAnimation to repeat forever
    orbitAnimation.setRepeatCount(ObjectAnimator.INFINITE);
    orbitAnimation.setRepeatMode(ObjectAnimator.RESTART);
    orbitAnimation.setInterpolator(new LinearInterpolator());
    orbitAnimation.setAutoCancel(true);

    return orbitAnimation;
  }

接下来，它开始动画:

  orbitAnimation = createAnimator();
  orbitAnimation.setTarget(this);
  orbitAnimation.setDuration(getAnimationDuration());
  orbitAnimation.start();

这篇关于如何在ARCore Sceneform中旋转动画以使节点旋转的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！