如何在 ARCore 和 Sceneform 中翻译对象？

Question

I build an AR application on Android, using ARCore and Sceneform, and I want to translate object on x , y or z axis when user clicks a button.

How can I do that?

I try to do that, when user press the button, I'm compose object Pose with translate Pose, remove object and create new one with translation. But after some clicks, I have SIG 9 (kill app).

Is there the other way?

Answer 1

You can translate a 3D object between two anchors using a button and the following approach .

or

For translating your object along the surface you should use OnGestureListener interface with its useful public methods such as:

• onDown(MotionEvent e)
• onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY)
• onLongPress(MotionEvent e)
• onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY)
• onShowPress(MotionEvent e)
• onSingleTapUp(MotionEvent e)

Here's an example on how you can redraw an object in onScroll() method:

android.view.GestureDetector.OnGestureListener

@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distX, float distY) {
   if (ptrCount < 2) {
       queuedSingleTaps.offer(motionEvent);
       return true;
   } else {
       return false;
   }
}

Hope this helps.