如何在ARCore Sceneform中旋转动画使节点旋转

时间:2018-09-18 18:06:48

标签: android arcore sceneform

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?

我知道我可以设置LocalRotation或WorldRotation,但是如何使这种动画以平滑的方式连续播放?

1 个答案:

答案 0 :(得分:8)

最简单的方法是使用Android Property Animation。例如,在Sceneform示例“太阳能系统”中。看一下RotatingNode。这将使节点绕其轴旋转。

首先,它会创建一个ObjectAnimator,它使用LinearInterpolation设置围绕一个圆的4个点之间的旋转。

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();