导入 USDZ 并在运行时单独处理每个表面的材质

huangapple
go评论93阅读模式
英文:

Import USDZ and manipulate materials for each surface separately at runtime

问题

基本上，我的需求是导入一个 usdz，例如一辆汽车。然后为每个车身部分应用不同的材质。例如，将材质 A 应用于车身，将材质 B 应用于侧镜，将材质 C 应用于轮毂等。

我可以遍历 ModelEntity 的 ModelComponent 中的材质，并按如下方式分配材质。

  1. func updateUIView(_ uiView: ARView, context: Context) {
  3.     let entity = try! Entity.loadModel(named: "CarScene")
  4.     
  5.     var material = PhysicallyBasedMaterial()
  6.     material.baseColor = PhysicallyBasedMaterial.BaseColor(tint:.red)
  7.     material.roughness = PhysicallyBasedMaterial.Roughness(floatLiteral: 0.0)
  8.     material.metallic = PhysicallyBasedMaterial.Metallic(floatLiteral: 1.0)
  9.   
  10.     for i in 0...(entity.model?.materials.count ?? 1) - 1 {
  11.         entity.model?.materials[i] = material
  12.     }
  13.     
  14.     let anchor = AnchorEntity(plane: .horizontal)
  15.     anchor.addChild(entity)
  17.     uiView.scene.addAnchor(carAnchor)
  18. }

但是，我不知道哪个材质对应哪个部分。如果我有多个 usdz 文件，我希望能够准确地为每个车身部分分配材质。这是否可行？

我是否需要在导入到我的 Xcode 项目之前分解 usdz 模型并分配标识符？任何帮助将不胜感激。

英文:

Basically, my requirement is to import a usdz, for an example, a car. Then apply different materials for each body part. Eg: material A to body, material B to side mirrors, material C to wheels etc.

I could iterate through the materials in the ModelEntity's ModelComponent and assign material as below.

  1. func updateUIView(_ uiView: ARView, context: Context) {
  3.     let entity = try! Entity.loadModel(named: "CarScene")
  4.     
  5.     var material = PhysicallyBasedMaterial()
  6.     material.baseColor = PhysicallyBasedMaterial.BaseColor(tint:.red)
  7.     material.roughness = PhysicallyBasedMaterial.Roughness(floatLiteral: 0.0)
  8.     material.metallic = PhysicallyBasedMaterial.Metallic(floatLiteral: 1.0)
  9.   
  10.     for i in 0...(entity.model?.materials.count ?? 1) - 1 {
  11.         entity.model?.materials[i] = material
  12.     }
  13.     
  14.     let anchor = AnchorEntity(plane: .horizontal)
  15.     anchor.addChild(entity)
  17.     uiView.scene.addAnchor(carAnchor)
  18. }

But, I don't know which material is which. If I have multiple usdz files, I want to be able to accurately assign materials for each body part. Is that doable?

Do I need to break the usdz model and assign identifiers before importing to my Xcode project? Any help would be really appreciated.

答案1

得分: 1

以下是代码的翻译部分：

  1. 使用以下示例代码，它展示了如何在运行时修改材料：
  3. import SwiftUI
  4. import RealityKit
  6. struct ARViewContainer: UIViewRepresentable {
  7.     
  8.     let arView = ARView(frame: .zero)
  9.     let fiat = try! Entity.load(named: "Fiat_Uno")
  10.     
  11.     func makeUIView(context: Context) -> ARView {
  12.         print(fiat)
  13.         fiat.scale /= 5
  14.         fiat.orientation = .init(angle: .pi/1.5, axis: [0,1,0])
  15.         let anchor = AnchorEntity()
  16.         anchor.addChild(fiat)
  17.         arView.scene.anchors.append(anchor)
  18.         return arView
  19.     }
  20.     func updateUIView(_ view: ARView, context: Context) {
  22.         DispatchQueue.main.asyncAfter(deadline: .now() + 0.75) {
  23.             let wheels = fiat.findEntity(named: "Rodas_Material_001_0")?
  24.                                               .children[0] as? ModelEntity
  25.             wheels?.model?.materials[0] = UnlitMaterial(color: .green)
  26.             
  27.             DispatchQueue.main.asyncAfter(deadline: .now() + 0.75) {
  28.                 let body = fiat.findEntity(named: "Fiat_UNO_Material_001_0")?
  29.                                             .children[0] as? ModelEntity
  30.                 body?.model?.materials[0] = UnlitMaterial(color: .blue)
  31.                 
  32.             }
  33.         }
  34.     }
  35. }
  37. struct ContentView : View {
  38.     var body: some View {
  39.         ARViewContainer().ignoresSafeArea()
  40.     }
  41. }

希望这些翻译对你有所帮助。如果你有任何其他问题，请随时提出。

英文:

Use the following sample code which shows you how to modify materials at runtime:

  1. import SwiftUI
  2. import RealityKit
  4. struct ARViewContainer: UIViewRepresentable {
  5.     
  6.     let arView = ARView(frame: .zero)
  7.     let fiat = try! Entity.load(named: "Fiat_Uno")
  8.     
  9.     func makeUIView(context: Context) -> ARView {
  10.         print(fiat)
  11.         fiat.scale /= 5
  12.         fiat.orientation = .init(angle: .pi/1.5, axis: [0,1,0])
  13.         let anchor = AnchorEntity()
  14.         anchor.addChild(fiat)
  15.         arView.scene.anchors.append(anchor)
  16.         return arView
  17.     }
  18.     func updateUIView(_ view: ARView, context: Context) {
  20.         DispatchQueue.main.asyncAfter(deadline: .now() + 0.75) {
  21.             let wheels = fiat.findEntity(named: "Rodas_Material_001_0")?
  22.                                               .children[0] as? ModelEntity
  23.             wheels?.model?.materials[0] = UnlitMaterial(color: .green)
  24.             
  25.             DispatchQueue.main.asyncAfter(deadline: .now() + 0.75) {
  26.                 let body = fiat.findEntity(named: "Fiat_UNO_Material_001_0")?
  27.                                                 .children[0] as? ModelEntity
  28.                 body?.model?.materials[0] = UnlitMaterial(color: .blue)
  29.                 
  30.             }
  31.         }
  32.     }
  33. }
  1. struct ContentView : View {
  2.     var body: some View {
  3.         ARViewContainer().ignoresSafeArea()
  4.     }
  5. }

huangapple
  • 本文由 发表于 2023年2月19日 20:27:25
  • 转载请务必保留本文链接：https://go.coder-hub.com/75500138.html
  • realitykit
  • swift
  • swiftui
  • usdz
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