本文整理了Java中com.google.ar.sceneform.math.Quaternion类的一些代码示例，展示了Quaternion类的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。Quaternion类的具体详情如下：
包路径：com.google.ar.sceneform.math.Quaternion
类名称：Quaternion

Quaternion介绍

暂无

代码示例

代码示例来源：origin: googlesamples/sceneform-samples

private static Quaternion negated(Quaternion quat) {
 return new Quaternion(-quat.x, -quat.y, -quat.z, -quat.w);
}

代码示例来源：origin: googlesamples/sceneform-samples

@Override
public void onUpdate(FrameTime frameTime) {
 float speed = (degreesPerSecond * frameTime.getDeltaSeconds());
 Quaternion deltaRot = Quaternion.axisAngle(Vector3.up(), speedMultiplier * speed);
 setLocalRotation(Quaternion.multiply(getLocalRotation(), deltaRot));
}

代码示例来源：origin: google-ar/sceneform-android-sdk

/**
 * When translating, the up direction of the node must match the up direction of the plane from
 * the hit result. However, we also need to make sure that the original forward direction of the
 * node is respected.
 */
private Quaternion calculateFinalDesiredLocalRotation(Quaternion desiredLocalRotation) {
 // Get a rotation just to the up direction.
 // Otherwise, the node will spin around as you rotate.
 Vector3 rotatedUp = Quaternion.rotateVector(desiredLocalRotation, Vector3.up());
 desiredLocalRotation = Quaternion.rotationBetweenVectors(Vector3.up(), rotatedUp);
 // Adjust the rotation to make sure the node maintains the same forward direction.
 Quaternion forwardInLocal =
   Quaternion.rotationBetweenVectors(Vector3.forward(), initialForwardInLocal);
 desiredLocalRotation = Quaternion.multiply(desiredLocalRotation, forwardInLocal);
 return desiredLocalRotation.normalized();
}

代码示例来源：origin: google-ar/sceneform-android-sdk

if (plane.isPoseInPolygon(pose) && allowedPlaneTypes.contains(plane.getType())) {
 desiredLocalPosition = new Vector3(pose.tx(), pose.ty(), pose.tz());
 desiredLocalRotation = new Quaternion(pose.qx(), pose.qy(), pose.qz(), pose.qw());
 Node parent = getTransformableNode().getParent();
 if (parent != null && desiredLocalPosition != null && desiredLocalRotation != null) {
  desiredLocalPosition = parent.worldToLocalPoint(desiredLocalPosition);
  desiredLocalRotation =
    Quaternion.multiply(
      parent.getWorldRotation().inverted(),
      Preconditions.checkNotNull(desiredLocalRotation));

代码示例来源：origin: google-ar/sceneform-android-sdk

@Override
public void onContinueTransformation(TwistGesture gesture) {
 float rotationAmount = -gesture.getDeltaRotationDegrees() * rotationRateDegrees;
 Quaternion rotationDelta = new Quaternion(Vector3.up(), rotationAmount);
 Quaternion localrotation = getTransformableNode().getLocalRotation();
 localrotation = Quaternion.multiply(localrotation, rotationDelta);
 getTransformableNode().setLocalRotation(localrotation);
}

代码示例来源：origin: googlesamples/sceneform-samples

Quaternion rotationFromAToB = Quaternion.lookRotation(directionFromTopToBottom, desiredUp);
  Quaternion.rotateVector(rotationFromAToB, Vector3.forward()).normalized();
Vector3 rightDirection =
  Quaternion.rotateVector(rotationFromAToB, Vector3.right()).normalized();
Vector3 upDirection = Quaternion.rotateVector(rotationFromAToB, Vector3.up()).normalized();
desiredUp.set(upDirection);

代码示例来源：origin: google-ar/sceneform-android-sdk

/** Returns an ObjectAnimator that makes this node rotate. */
 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;
 }
}

代码示例来源：origin: googlesamples/sceneform-samples

lerp(rotations.get(segmentIndex), rotations.get(segmentIndex + 1), .5f);
Vector3 rightDirection =
  Quaternion.rotateVector(averagedRotation, Vector3.right()).normalized();
Vector3 upDirection = Quaternion.rotateVector(averagedRotation, Vector3.up()).normalized();

代码示例来源：origin: google-ar/sceneform-android-sdk

@Override
 public void onUpdate(FrameTime frameTime) {
  if (infoCard == null) {
   return;
  }

  // Typically, getScene() will never return null because onUpdate() is only called when the node
  // is in the scene.
  // However, if onUpdate is called explicitly or if the node is removed from the scene on a
  // different thread during onUpdate, then getScene may be null.
  if (getScene() == null) {
   return;
  }
  Vector3 cameraPosition = getScene().getCamera().getWorldPosition();
  Vector3 cardPosition = infoCard.getWorldPosition();
  Vector3 direction = Vector3.subtract(cameraPosition, cardPosition);
  Quaternion lookRotation = Quaternion.lookRotation(direction, Vector3.up());
  infoCard.setWorldRotation(lookRotation);
 }
}

代码示例来源：origin: google-ar/sceneform-android-sdk

private void updateRotation(FrameTime frameTime) {
 // Store in local variable for nullness static analysis.
 Quaternion desiredLocalRotation = this.desiredLocalRotation;
 if (desiredLocalRotation == null) {
  return;
 }
 Quaternion localRotation = getTransformableNode().getLocalRotation();
 float lerpFactor = MathHelper.clamp(frameTime.getDeltaSeconds() * LERP_SPEED, 0, 1);
 localRotation = Quaternion.slerp(localRotation, desiredLocalRotation, lerpFactor);
 float dot = Math.abs(dotQuaternion(localRotation, desiredLocalRotation));
 if (dot >= ROTATION_DOT_THRESHOLD) {
  localRotation = desiredLocalRotation;
  this.desiredLocalRotation = null;
 }
 getTransformableNode().setLocalRotation(localRotation);
}

代码示例来源：origin: google-ar/sceneform-android-sdk

desiredLocalRotation = calculateFinalDesiredLocalRotation(Quaternion.identity());

代码示例来源：origin: googlesamples/sceneform-samples

private static Quaternion lerp(Quaternion a, Quaternion b, float ratio) {
  return new Quaternion(
    MathHelper.lerp(a.x, b.x, ratio),
    MathHelper.lerp(a.y, b.y, ratio),
    MathHelper.lerp(a.z, b.z, ratio),
    MathHelper.lerp(a.w, b.w, ratio));
 }
}