In this project, Tap to Place, allows users to place 3D objects on real-world surfaces using their phone’s camera. The app detects the floor, places objects, and enables users to scale & move them dynamically.

1. Project Overview

Technology Used: AR Foundation, Unity, C#
Core Features:

• Surface Detection: Uses the phone camera to recognize real-world flat surfaces.
• Tap to Place: Tap on a detected surface to place a 3D object.
• Scale & Move: Pinch-to-zoom to resize and drag to reposition objects.

2. How It Works

a. Surface Detection

• The app uses AR Plane Detection to identify floors.
• AR Raycasting helps determine where the 3D object should be placed.

void DetectSurface(Vector2 touchPosition)
{
    if (arRaycastManager.Raycast(touchPosition, hitResults, TrackableType.PlaneWithinPolygon))
    {
        Pose hitPose = hitResults[0].pose;
        PlaceObject(hitPose);
    }
}

b. Placing 3D Objects

• A prefab is instantiated at the detected position.

void PlaceObject(Pose spawnPosition)
{
    if (spawnedObject == null)
    {
        spawnedObject = Instantiate(objectPrefab, spawnPosition.position, spawnPosition.rotation);
    }
}

c. Scaling & Moving the Object

• Pinch Gesture to scale the object.
• Drag Gesture to move it around the surface.

void ScaleObject(float scaleFactor)
{
    spawnedObject.transform.localScale *= scaleFactor;
}

3. Setting Up AR Foundation in Unity

1️⃣ Install AR Foundation

• Go to Unity Package Manager → Install AR Foundation & ARCore XR Plugin (Android) / ARKit XR Plugin (iOS)

2️⃣ Setup AR Session

• Add AR Session and AR Session Origin to the scene.

3️⃣ Enable Plane Detection

• Attach an AR Plane Manager component to detect surfaces.

4️⃣ Implement Raycasting

• Use ARRaycastManager to find valid placement points.

4. Future Improvements

🔹 Object rotation using touch gestures.
🔹 Multi-object placement for more interactive scenes.
🔹 Save and reload placed objects using persistent AR.

5. Testing