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AR without SceneKit
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naru-jpn
February 07, 2018
Programming
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AR without SceneKit
Create AR application using Metal without SceneKit
naru-jpn
February 07, 2018
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Transcript
AR without SceneKit #mobilearmeetup @Timers 2018/2/7
Relation of ARKit and SceneKit
ARKit Camera SceneKit Pixel Buffer 3D Info Rendering ARSCNView
ARKit Camera SceneKit Pixel Buffer 3D Info Rendering ARSCNView Light
Estimation Plane Detection Manage 3D Objects
Remove SceneKit and Use Metal
ARKit Camera SceneKit Pixel Buffer 3D Info Rendering ARSCNView Light
Estimation Plane Detection Manage 3D Objects
ARKit Camera Pixel Buffer 3D Info Light Estimation Plane Detection
Metal ARKit Camera Pixel Buffer 3D Info Light Estimation Plane
Detection Rendering
Metal ARKit Camera Pixel Buffer 3D Info Rendering Light Estimation
Plane Detection Take Photo
MetalAR https://github.com/naru-jpn/MetalAR
None
Metal ARKit Camera Pixel Buffer 3D Info Light Estimation Plane
Detection Rendering Take Photo
// Create ARSession session = ARSession() // ARSessionDelegate session.delegate =
self
Metal ARKit Camera Pixel Buffer 3D Info Light Estimation Plane
Detection Rendering Take Photo
// Defined in ARSessionDelegate // Called when ARFrame is updated
func session(_ session: ARSession, didUpdate frame: ARFrame) { // … }
A running AR session continuously captures video frames from the
device camera. For each frame, ARKit analyzes the image together with data from the device's motion sensing hardware to estimate the device's real-world position. ARFrame https://developer.apple.com/documentation/arkit/arframe
Metal ARKit Camera Pixel Buffer 3D Info Light Estimation Plane
Detection Rendering Take Photo
Pipeline of off-screen rendering Draw video frame Filter Draw Instances
ARFrame MTLTexture
Pipeline of off-screen rendering Filter Draw Instances ARFrame MTLTexture Draw
video frame Commands sent to GPU
Pipeline of off-screen rendering Filter Draw Instances ARFrame MTLTexture MPSImageSobel
declared in Metal Performance Shaders Draw video frame Commands sent to GPU
Performance on iPhone7
Filter Draw Instances ARFrame MTLTexture Draw video frame 3.3 ms
Rendering
Making Image to save drawHierarchy(in:afterScreenUpdates:) MTLTexture → CGImage 7.0 ~
10.0 ms available on background thread 30.0 ~ 40.0 ms required to execute on main thread
Challenges
Drawing original 3D objects User Interaction (available hitTest(_:types:) for ARFrame)
Physics engine Skeletal Animation …
References
Documents Metal Best Practices Guide https://developer.apple.com/library/content/documentation/ 3DDrawing/Conceptual/MTLBestPracticesGuide/index.html#// apple_ref/doc/uid/TP40016642-CH27-SW1 Metal Shading
Language Specification https://developer.apple.com/metal/Metal-Shading-Language- Specification.pdf
AR Template Project