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ARKitDemo

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ARKit学习Demo合集

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### ARKit学习
1. [ARKit点击屏幕增加文字](#1)
2. [ARKit点击屏幕增加3D模型](#2)
3. [ARKit检测到平面自动增加3D模型](#3)
4. [QuickLook的最简单使用](#4)
5. [ARKit人脸贴图](#5)
6. [ARKit微笑检测](#6)
7. [ARKit皱眉检测](#7)
8. [ARKit人脸参数BlendShapes详解](#8)

<h4 id='1'>1. ARKit点击屏幕增加文字</h4>

![1.点击屏幕增加文字.gif](https://upload-images.jianshu.io/upload_images/1679203-104748b6456ce8d7.gif?imageMogr2/auto-orient/strip%7CimageView2/2/w/200)

* command+shift+n新建一个项目，然后选择`Augmented Reality App`

* 在Content Technology中选择`SpriteKit`即可

* 控制文字距离相机的距离(改变这个Z感受一下变化)
```objectivec
matrix_float4x4 translation = matrix_identity_float4x4;
translation.columns[3].z = -1;
```
<h4 id='2'>2. ARKit点击屏幕增加3D模型</h4>

![2.点击屏幕增加3D模型.gif](https://upload-images.jianshu.io/upload_images/1679203-5a944e1459d2d6bc.gif?imageMogr2/auto-orient/strip%7CimageView2/2/w/200)

主要就是三个类：
* `ARSCNView`: 画面显示
* `ARConfiguration`: 捕捉画面
	* `ARWorldTrackingConfiguration`:后置摄像头
	* `ARFaceTrackingConfiguration`：前置摄像头,会实时监测面部表情特征
* `ARSession`:数据中转

在`viewDidLoad`的时候初始化资源

```objectivec
self.arSCNView = [[ARSCNView alloc] initWithFrame:self.view.bounds options:nil];
    self.arSCNView.session = [[ARSession alloc] init];
    // 1. 创建世界追踪配置，需要支持A9芯片也就是iPhone6S以上
    self.arWordTrackingConfiguration = [[ARWorldTrackingConfiguration alloc] init];
    // 2. 设置追踪方向,追踪平面
    self.arWordTrackingConfiguration.planeDetection = ARPlaneDetectionHorizontal;
    self.arWordTrackingConfiguration.lightEstimationEnabled = YES;
```

在`viewDidAppear`时让session开始工作
```objectivec
[self.arSession runWithConfiguration:self.arWordTrackingConfiguration]
```
##### 2.2 点击增加3D图像
当点击屏幕的时候加载一个scn文件并且作为childNode添加到self.arSCNView.scene.rootNode

```objectivec
- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    // 1. 使用场景加载scn文件
    SCNScene *scene = [SCNScene sceneNamed:@"art.scnassets/ship.scn"];
    
    SCNNode *shipNode = scene.rootNode.childNodes.firstObject;
    shipNode.position = SCNVector3Make(0, -1, -1);
    
    [self.arSCNView.scene.rootNode addChildNode:shipNode];
}
```

<h4 id='3'>3. ARKit检测到平面自动增加3D模型</h4>

![3.检测到平面增加3D模型.gif](https://upload-images.jianshu.io/upload_images/1679203-e68ce9a09254f8e9.gif?imageMogr2/auto-orient/strip%7CimageView2/2/w/200)

前期准备工作和[2.1](#2.1)一样，只是增加了`self.arSCNView.delegate = self`
然后在代理方法`renderer:didAddNode:forAnchor:`中实现以下代码：

```objectivec
#pragma mark - ARSCNViewDelegate
// 添加节点的时候调用(当开启平地捕捉模式之后，如果捕捉到平地，ARKit会自动添加一个平地节点)
- (void)renderer:(id<SCNSceneRenderer>)renderer didAddNode:(SCNNode *)node forAnchor:(ARAnchor *)anchor {
    
    if (![anchor isMemberOfClass:[ARPlaneAnchor class]]) return;
    
    // 添加一个3D平面模型，ARKit只有捕捉能力，锚点只是一个空间位置，想更加清楚看到这个空间，我们需要给控件添加一个平地的3D模型来渲染它
    // 1. 获取捕捉到的平地锚点
    ARPlaneAnchor *planeAnchor = (ARPlaneAnchor *)anchor;
    // 2. 创建一个3D模型(系统捕捉到的平地是一个不规则的大小长方形，这里笔者q将其变成一个长方形，并且对平地做了一个缩放效果)
    // 参数分别是长、宽、高、圆角
    SCNBox *planeBox = [SCNBox boxWithWidth:planeAnchor.extent.x * 0.3 height:0 length:planeAnchor.extent.x * 0.3 chamferRadius:0];
    // 3. 使用Material渲染3D模型(默认模型是白色的)
    planeBox.firstMaterial.diffuse.contents = [UIColor clearColor];
    // 4. 创建一个基于3D物体模型的节点
    SCNNode *planeNode = [SCNNode nodeWithGeometry:planeBox];
    // 5. 设置节点的位置为捕捉到的平地的锚点的中心位置
    // SceneKit中节点的位置position是一个基于3D坐标系的矢量坐标SCNVector3Make
    planeNode.position = SCNVector3Make(planeAnchor.center.x, 0, planeAnchor.center.z);
    
    [node addChildNode:planeNode];
    
    // 6. 创建一个花瓶场景
    SCNScene *scene = [SCNScene sceneNamed:@"art.scnassets/vase/vase.scn"];
    // 7. 获取花瓶节点
    // 一个场景有多个节点，所有场景有且只有一个根节点，其它所有节点都是根节点的子节点
    SCNNode *vaseNode = scene.rootNode.childNodes.firstObject;
    // 8. 设置花瓶节点的位置为捕捉到的平地的位置，如果不设置，则默认为原点位置也就是相机位置
    vaseNode.position = SCNVector3Make(planeAnchor.center.x, 0, planeAnchor.center.z);
    // 9. 将花瓶节点添加到屏幕中
    // !!!!FBI WARNING: 花瓶节点是添加到代理捕捉到的节点中，而不是AR视图的根接节点。
    // 因为捕捉到的平地锚点是一个本地坐标系，而不是世界坐标系
    [node addChildNode:vaseNode];
}
```
<h4 id='4'>4. QuickLook的最简单使用</h4>

![4.QuickLook简单使用.gif](https://upload-images.jianshu.io/upload_images/1679203-1b5460945c31e271.gif?imageMogr2/auto-orient/strip%7CimageView2/2/w/200)

这个没什么好说的，直接上代码

```objectivec
#import "ViewController.h"
#import <QuickLook/QuickLook.h>

@interface ViewController ()<QLPreviewControllerDataSource, QLPreviewControllerDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    QLPreviewController *preVC = [[QLPreviewController alloc] init];
    preVC.dataSource = self;
    preVC.delegate = self;
    
    [self presentViewController:preVC animated:YES completion:nil];
}

#pragma mark - QLPreviewControllerDataSource && QLPreviewControllerDelegate
- (NSInteger)numberOfPreviewItemsInPreviewController:(QLPreviewController *)controller {
    return 1;
}

- (id<QLPreviewItem>)previewController:(QLPreviewController *)controller previewItemAtIndex:(NSInteger)index {
    
    return [[NSBundle mainBundle] URLForResource:@"plantpot.usdz" withExtension:nil];
}

- (UIImage *)previewController:(QLPreviewController *)controller transitionImageForPreviewItem:(id<QLPreviewItem>)item contentRect:(CGRect *)contentRect {
    
    CGRect rect = CGRectMake(100, 200, 300, 300);
    contentRect = &rect;
    
    return [UIImage imageNamed:@"wy.jpeg"];
}
```
<h4 id='5'>5. ARKit人脸贴图</h4>

![5.人脸贴图.gif](https://upload-images.jianshu.io/upload_images/1679203-65ac818e1cfa8df5.gif?imageMogr2/auto-orient/strip%7CimageView2/2/w/200)

设置session的configuration为`ARFaceTrackingConfiguration`,然后在ARSCNView的代理`renderer:willUpdateNode:forAnchor`中增加一个`SCNNode`核心代码如下：
* 创建`SCNNode`
	* 试试看设置fillMesh为YES会怎么样
	* 试试看设置masterial.diffuse.contents为一个颜色会怎么样

```
- (SCNNode *)textureMaskNode {
    if (!_textureMaskNode) {
        
        id<MTLDevice> device = self.arSCNView.device;
        ARSCNFaceGeometry *geometry = [ARSCNFaceGeometry faceGeometryWithDevice:device fillMesh:NO];
        SCNMaterial *material = geometry.firstMaterial;
        material.fillMode = SCNFillModeFill;
        material.diffuse.contents = [UIImage imageNamed:@"wy.jpg"];
        _textureMaskNode = [SCNNode nodeWithGeometry:geometry];
    }
    _textureMaskNode.name = @"textureMask";
    return _textureMaskNode;
}
```
* 添加`SCNNode`并更新人脸特征

```objectivec
- (void)renderer:(id<SCNSceneRenderer>)renderer willUpdateNode:(SCNNode *)node forAnchor:(ARAnchor *)anchor {
    
    if (!anchor || ![anchor isKindOfClass:[ARFaceAnchor class]]) return;
    ARFaceAnchor *faceAnchor = (ARFaceAnchor *)anchor;
    
    if (!_textureMaskNode) {
        [node addChildNode:self.textureMaskNode];
    }
    
    ARSCNFaceGeometry *faceGeometry = (ARSCNFaceGeometry *)self.textureMaskNode.geometry;
    if (faceGeometry && [faceGeometry isKindOfClass:[ARSCNFaceGeometry class]]) {
        [faceGeometry updateFromFaceGeometry:faceAnchor.geometry];
    }
}
```
<h4 id='6'>6. ARKit微笑检测</h4>

![6.微笑检测.gif](https://upload-images.jianshu.io/upload_images/1679203-1a9e833e222dce7e.gif?imageMogr2/auto-orient/strip%7CimageView2/2/w/200)

主要用到了`ARBlendShapeLocationMouthSmileLeft`和`ARBlendShapeLocationMouthSmileRight`表示微笑的键值
我提供的demo是用于调试微笑阀值的
核心代码：

```
- (void)renderer:(id<SCNSceneRenderer>)renderer didUpdateNode:(SCNNode *)node forAnchor:(ARAnchor *)anchor {
    
    if (!anchor || ![anchor isKindOfClass:[ARFaceAnchor class]]) return;
    
    ARFaceAnchor *faceAnchor = (ARFaceAnchor *)anchor;
    
    NSDictionary *blendShips = faceAnchor.blendShapes;
    CGFloat leftSmile = [blendShips[ARBlendShapeLocationMouthSmileLeft] floatValue];
    CGFloat rightSmile = [blendShips[ARBlendShapeLocationMouthSmileRight] floatValue];
    
    NSLog(@"leftSmile = %f, rightSmile = %f", leftSmile, rightSmile);
    if (leftSmile > self.smileValue && rightSmile > self.smileValue) {
        NSLog(@"检测到笑容");
        [self.arSession pause];
        dispatch_async(dispatch_get_main_queue(), ^{
            self.resultLabel.hidden = NO;
        });
    }
}
```

<h4 id='7'>7. ARKit皱眉检测</h4>

![7.皱眉检测.gif](https://upload-images.jianshu.io/upload_images/1679203-1c18bd6d24767258.gif?imageMogr2/auto-orient/strip%7CimageView2/2/w/200)

我这里用的是眉毛向上的键值`ARBlendShapeLocationBrowInnerUp`
核心代码：

```
- (void)renderer:(id<SCNSceneRenderer>)renderer didUpdateNode:(SCNNode *)node forAnchor:(ARAnchor *)anchor {
    
    if (!anchor && ![anchor isKindOfClass:[ARFaceAnchor class]]) return;
    
    ARFaceAnchor *faceAnchor = (ARFaceAnchor *)anchor;
    NSDictionary *blendShapes = faceAnchor.blendShapes;
    NSNumber *browInnerUp = blendShapes[ARBlendShapeLocationBrowInnerUp];
    
    if ([browInnerUp floatValue] > self.browValue) {
        [self.arSession pause];
        dispatch_async(dispatch_get_main_queue(), ^{
            self.resultLabel.hidden = NO;
        });
    }
    
    NSLog(@"browInnerUp = %@", browInnerUp);
}
```
<h4 id='8'>8. BlendShapes</h4>

* 仅在iOS11及以上可用，每个参数的详细介绍和图片对比可以打开Xcode->Window->Developer Documentation,然后搜索对应的键值即可
* 每个建对应的值都是0~1的值
* 共51个表示人脸特征的参数

<div id='mouth'>1. ARBlendShapeLocationMouthClose</div>
<img src="https://upload-images.jianshu.io/upload_images/1679203-da94882a82af11f8.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240" width=375 />

ARKitDemo

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