Move object along detected ground plane via camera center (without dragging/touch events)

[skizzo]

Environment

1. Development OS: Mac (OS: Ventura 13.3.1 (a))
2. Device OS & Version: Android 12
3. Version: ViroReact: 2.23.0, React Native: 0.71.7, React: 18.2.0
4. Device(s): Samsung Galaxy A71 (SM-A715F)

Description

I would like to place an object (in my case, a simple ViroBox) on a ground plane that has been before detected manually. For this, I would need to continuously determine a 3D position on (/relative to) said ground floor (which itself is a very thing ViroBox) based on which direction the camera is currently facing.

I am aware that this could be achieved by using a drag plane, but need to avoid any user interaction except rotating the device, so manually dragging the object along the ground plane is not an option.

I tried to illustrate the issue in the following image:

Possible Approaches

1: ViroARScene.performARHitTestWithPoint(x,y)

• The array of ARHitTestResult objects returned from calling performARHitTestWithPoint() for my scene only returns anything I can work with (with typebeing either ExistingPlaneUsingExtent or ExistingPlane) when the camera center is really close to the ground plane's origin.
• Since I can't control the size of the detected anchor that defines my ground plane, this method can't be used in a way that works for all cases ❌

2: ViroARScene.getCameraOrientationAsync() + ViroBox.getTransformAsync()

• The current camera position & orientation can be determined with the ViroARScene.getCameraOrientationAsync() function,
• the current ground plane's rotation can be determined with the ViroBox.getTransformAsync() function.
• It may be possible to use these 2 infos to cast a ray from the current camera center onto the ground plane, but I don't know how to since my vector math is kind of bad.

---

So basically my question is: Can I (and if yes, how) "convert" the camera center (a 2D point) to a 3D point (either in world coordinates, or relative to my found anchor) in my Viro 3D scene?

Thank you for any insights and this great library in general!