如何使用Arkit Scenekit创建类似qlone 3d扫描仪应用程序的AR圆顶

如何解决如何使用Arkit Scenekit创建类似qlone 3d扫描仪应用程序的AR圆顶

我正在寻找在Scenekit中创建AR穹顶形状几何体的方法，就像它是在qlone 3D扫描仪应用程序中创建的一样。 请参考以下链接以获取视觉效果。

https://www.youtube.com/watch?v=0JQZmTT3KO0

https://3dscanexpert.com/qlone-3d-scanning-ios-app/

enter image description here

解决方法

模型 IO api MDLMesh.newEllipsoid 创建圆顶，现在我们需要在圆顶的每个部分上放置瓷砖。

1. 创建圆顶并获取顶点，并使用顶点创建图块并将它们作为单独的 SCNNode 放置。

导入 UIKit 导入场景套件 导入 ARKit 导入模型IO

ARDome 类：SCNNode {

private var sceneView: ARSCNView!
private var radius: Float = 0.0
private var radialSegments: Int = 0
private var verticalSegments: Int = 0
private var maxDistanceToFocusPoint: Float = 0.05
private var minSize = SIMD3<Float>(0.01,0.01,0.01)
var tilesContinuousHitCount = [SCNNode:Int]()

private var extent = SIMD3<Float>(0.01,0.01) {
    didSet {
        extent = max(extent,minSize)
    }
}

init(sceneView: ARSCNView,radius: Float,radialSegments: Int,verticalSegments: Int) {
    super.init()
    self.sceneView = sceneView
    self.radius = radius
    self.radialSegments = radialSegments
    self.verticalSegments = verticalSegments
    //self.categoryBitMask = 0x0
}

required init?(coder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

func domeSkeleton() {
    let mesh = MDLMesh.newEllipsoid(withRadii: vector_float3(radius,radius,radius),radialSegments: radialSegments,verticalSegments: verticalSegments,geometryType: MDLGeometryType.lines,inwardNormals: true,hemisphere: true,allocator: nil)
    
    self.geometry = SCNGeometry(mdlMesh: mesh)
    self.geometry?.firstMaterial?.diffuse.contents = UIColor.appYellow
    self.geometry?.firstMaterial?.isDoubleSided = true
}

func placeTiles() {
    guard let geometry = self.geometry else { return }
    let vertices = helper.testim(geo: geometry)
    let rings = vertices.chunked(into: radialSegments + 1)
    for base in 0..<(verticalSegments/2) {
        let bottom = base + 1
        let top = base
        for i in 0..<(radialSegments) {
            let rectNode = helper.getNode(lb: rings[bottom][i],lt: rings[top][i],rt: rings[top][i+1],rb: rings[bottom][i+1])
            self.addChildNode(rectNode)
        }
    }
}

}

助手类

导入 UIKit 导入场景套件 导入 ARKit 导入模型IO

类助手{ public static func getNode(lb: SCNVector3,lt: SCNVector3,rt: SCNVector3,rb: SCNVector3) -> DomeTile{ 让顶点：[SCNVector3] = [lb,lt,rt,rb,] 让源 = SCNGeometrySource（顶点：顶点） 让索引：[UInt16] = [0,1,2,3,] 让元素 = SCNGeometryElement（索引：索引，primitiveType：.triangles） 让几何 = SCNGeometry（来源：[来源]，元素：[元素]） geometry.firstMaterial?.isDoubleSided = true geometry.firstMaterial?.diffuse.contents = UIColor.spectrumBlue.withAlphaComponent(0.7) 让节点 = DomeTile（几何：几何） 返回节点 }

public static func testim(geo: SCNGeometry) -> [SCNVector3] {
    //let rect = SCNBox(width: 40.0,height: 40.0,length: 5.0,chamferRadius: 0.0)
    let srcs = geo.sources(for: .vertex)
    guard let src = srcs.first else { exit(1)}
    
    let bperC = src.bytesPerComponent
    let stride = src.dataStride / bperC
    let offset = src.dataOffset / bperC
    let vectorCount = src.vectorCount
    
    let vertices = src.data.withUnsafeBytes { (buffer : UnsafePointer<Float>) -> [SCNVector3] in
        var result = Array<SCNVector3>()
        for i in 0...vectorCount - 1 {
            let start = i * stride + offset
            let x = buffer[start]
            let y = buffer[start + 1]
            let z = buffer[start + 2]
            result.append(SCNVector3(x,y,z))
        }
        return result
    }
    return vertices
}

}

扩展数组{ func chunked(into size: Int) -> [[Element]] { return stride(from: 0,to: count,by: size).map 数组(self[$0 ..