Unity AR Butterfly

Attended the "Create Augmented Reality App" Webinar by Gen In finiti Academy, 13 Aug 2020, 7.30pm-9.30pm - Conducted by Emmanual Tay

• Change build settings to Android/mobile
• Delete Main camera and Directional Light
• Window > Package Manager > AR Foundation > Install
• Window > Package Manager > ARCore XD Plugin > Install
• Window > Package Manager > ARkit Xr Plugin > Install
• Rightclick on Hierarchy Window > XR > AR Session origin
• Double click the tiny AR Session origin > look under inspector > tag: MainCamera
• Rightclick on Hierarchy Window > XR > AR Session (coordinates the real world)
• Rightclick on Hierarchy Window > XR > AR Default Plane
• Click on AR Session Origin in Hierarchy > Look in Inspector > Add Component > AR Raycast Manager (checks for floor)
• Click on AR Session Origin in Hierarchy > Look in Inspector > Add Component > AR Plane Manager (allows you to tag and project things)
• Now we want to add a plane prefab, first we create a folder in project called “prefabs”
• Drag the AR Default Plane into the Prefabs folder
• Drag the blue AR Default Prefab into inspector slot for AR Session Origin > plane manager > plane prefab
• Create in project a scripts folder
• Create a new C# script “PlaceOnPlane.cs” - open it in editor of choice (be careful about naming of file)
• Drag and drop PlaceOnPlane script into AR session origin
• Download free asset butterfly (just go to Asset Store and look for the free Animated Butterly asset
• Download and import the butterfly asset - THIS ONE: https://assetstore.unity.com/packages/3d/characters/animals/butterfly-animated-58355
• Newly imported Butterfly asset folder > Double click on FBX > Double click on Materials
• Select second sphere (blue metallic) butterfly_Albedo > select the image material in emissions (otherwise butterfly will not show up)
• Assets > Butterfly Animated > Prefab > left click on butterfly and drag it inside Place On Place Model (inside AR Session Origin)
• Project Settings > Player > Other setting > Identification > Minimum API Level > Set to Android 7.1
• Build and Run
• Copy the apk to your phone
• Recklessly install it on your phone
• AR BUTTERFLY APP COMPLETE

PlaceOnPlane.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.XR.ARFoundation;
using UnityEngine.EventSystems;

public class PlaceOnPlane : MonoBehaviour
{
    ARRaycastManager raycastManager;
    List<ARRaycastHit> hits;

    public GameObject model;
    
    void Start()
    {
        raycastManager = GetComponent<ARRaycastManager>();
        hits = new List<ARRaycastHit>();
    }

    // Update is called once per frame
    void Update()
    {
        if (Input.touchCount == 0)
            return;

        Touch touch = Input.GetTouch(0);

        if (IsPointerOverUIObject(touch.position))
            return;

        if (raycastManager.Raycast(touch.position, hits))
        {
            Pose pose = hits[0].pose;

            Instantiate(model, pose.position, pose.rotation);
        }
    }

    bool IsPointerOverUIObject(Vector2 pos)
    {
        if (EventSystem.current == null)
            return false;
        PointerEventData eventDataCurrentPosition = new PointerEventData(EventSystem.current);
        eventDataCurrentPosition.position = new Vector2(pos.x, pos.y);
        List<RaycastResult> results = new List<RaycastResult>();
        EventSystem.current.RaycastAll(eventDataCurrentPosition, results);
        return results.Count > 0;
    }
}