Click on active surface to place GameObject with 8th Wall XR? - unity3d

Question

With 8th Wall XR is it possible to click on a surface and make it the active surface and place a gameobject on the position of the click? Kinda like ARKit which only augments the gameobject after clicking on it.

Answer 1

Something like this should do the trick. You'll need a GameObject (i.e. a Plane) with an XRSurfaceController attached, and put it on a Layer called "Surface":
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class PlaceObject : MonoBehaviour {
// Adjust this if the transform isn't at the bottom edge of the object
public float heightAdjustment = 0.0f;
// Prefab to instantiate. If null, the script will instantiate a Cube
public GameObject prefab;
// Scale factor for instantiated GameObject
public float objectScale = 1.0f;
private GameObject myObj;
void Update() {
// Tap to place
if (Input.touchCount == 1 && Input.GetTouch(0).phase == TouchPhase.Began ) {
RaycastHit hit;
Ray ray = Camera.main.ScreenPointToRay (Input.GetTouch (0).position);
// The "Surface" GameObject with an XRSurfaceController attached should be on layer "Surface"
// If tap hits surface, place object on surface
if(Physics.Raycast(ray, out hit, 100.0f, LayerMask.GetMask("Surface"))) {
CreateObject(new Vector3(hit.point.x, hit.point.y + heightAdjustment, hit.point.z));
}
}
}
void CreateObject(Vector3 v) {
// If prefab is specified, Instantiate() it, otherwise, place a Cube
if (prefab) {
myObj = GameObject.Instantiate(prefab);
} else {
myObj = GameObject.CreatePrimitive(PrimitiveType.Cube);
}
myObj.transform.position = v;
myObj.transform.localScale = new Vector3(objectScale, objectScale, objectScale);
}
}