mlkit-arkit's Introduction

MLKit-ARKit

This simple project detects objects using Firebase ML Kit and tags them in with 3D labels in Augmented Reality.

Based on: CoreML-in-ARKit

Demo Video

Language: Swift 4.0

Content Technology: SceneKit, Firebase ML Kit

Note: SceneKit can achieve a 60 FPS on iPhone7+ - though when it gets hot, it'll drop to 30 FPS.

Footnotes

SceneKit Text Labels are expensive to render. Too many polygons (too much text, smoothness, characters) - can cause crashes. In future, SpriteKit would be more efficient for text-labels.
Whilst ARKit's FPS , is displayed - ML Kit's speed is not. However, it does appear sufficiently fast for real-time ARKit applications.
Placement of the label is simply determined by the raycast screen centre-point to a ARKit feature-point. This could be altered for more stable placement.

Building Blocks (Overview)

Get ML Kit running in real time in ARKit

What we do differently here is we're using ARKit's ARFrame as the image to be fed into ML Kit.

let pixbuff : CVPixelBuffer? = (sceneView.session.currentFrame?.capturedImage)

We also use Threading to continuously run requests to ML Kit in realtime, and without disturbing ARKit / SceneView

let dispatchQueueML = DispatchQueue(label: "dispatchqueueml")
...
loopMLKitUpdate() // on viewLoad
...
func loopMLKitUpdate() {
    dispatchQueueML.async {
        // 1. Run Update.
        self.updateMLKit()
        // 2. Loop this function.
        self.loopMLKitUpdate()
    }
}

Add 3D Text

Add a Tap Gesture.
On Tap. Get the raycast centre point, translating it to appropriate coordinates.
Render 3D text at that location. Use the most likely object.

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