UpdatePlane

UpdatePlane.swift

public func update(from planeAnchor: ARPlaneAnchor) {
    // We need to create a new geometry each time because it does not seem to update correctly for physics
    guard let device = MTLCreateSystemDefaultDevice(),
        let geom = ARSCNPlaneGeometry(device: device) else {
            fatalError()
    }

    geom.firstMaterial?.diffuse.contents = UIColor.blue.withAlphaComponent(0.3)
    geom.update(from: planeAnchor.geometry)

    // We modify our plane geometry each time ARKit updates the shape of an existing plane
    geometry = geom

    // We have to specify we want to use the bounding box or it does not work
    let shape = SCNPhysicsShape(geometry: geom, options: [SCNPhysicsShape.Option.type: SCNPhysicsShape.ShapeType.boundingBox])

    physicsBody = SCNPhysicsBody(type: .static, shape: shape)
}