ARKit：在 didUpdate 方法中渲染多个锚点和节点

Question

尝试在 renderer(_ renderer:didUpdate:for:) 方法中为不同的锚点更新两个不同的节点 看起来它让我只更新一个节点，但我需要两个： ARFaceAnchor 和 ARMeshAnchor 我该如何解决这个问题？

// 1
    func renderer(_ renderer: SCNSceneRenderer, didUpdate node: SCNNode, for anchor: ARAnchor ) {
        if let faceAnchor = anchor as? ARFaceAnchor {
            targetFaceGeometry = faceAnchor.geometry
        }
    }

&

// 2
   func renderer(_ renderer: SCNSceneRenderer, didUpdate node: SCNNode, for anchor: ARAnchor ) {
        if let meshAnchor = anchor as? ARMeshAnchor {
            let geometry = createGeometryFromAnchor(meshAnchor: meshAnchor)
            geometry.firstMaterial?.colorBufferWriteMask = [.alpha]
            node.geometry = geometry
        }
    }

Answer 1

您可以在一个函数中处理这两种情况

func renderer(_ renderer: SCNSceneRenderer, didUpdate node: SCNNode, for anchor: ARAnchor) {
    if let faceAnchor = anchor as? ARFaceAnchor {
        targetFaceGeometry = faceAnchor.geometry
    } else if let meshAnchor = anchor as? ARMeshAnchor {
        let geometry = createGeometryFromAnchor(meshAnchor: meshAnchor)
        geometry.firstMaterial?.colorBufferWriteMask = [.alpha]
        node.geometry = geometry
    }
}