RealityKit –以编程方式将材料添加到ModelEntity [英] RealityKit – Adding a Material to a ModelEntity programmatically

问题描述

RealityKit的文档包括以下结构:OcclusionMaterial，SimpleMaterial和UnlitMaterial用于向ModelEntity添加材料.

The docs for RealityKit include the structs: OcclusionMaterial, SimpleMaterial, and UnlitMaterial for adding materials to a ModelEntity.

或者，您可以在模型中加载带有附加材料的模型.

Alternatively you can load in a model with a material attached to it.

我想以编程方式向ModelEntity添加自定义材料/纹理.如何在不向Reality Composer或其他3D软件的模型中添加材料的情况下即时实现这一目标?

I want to add a custom material/texture to a ModelEntity programmatically. How can I achieve this on the fly without adding the material to a model in Reality Composer or some other 3D software?

推荐答案

更新时间:2020年6月23日.

目前RealityKit 2.0中有4种类型的材料:

• SimpleMaterial
• UnlitMaterial
• 遮挡材料
• 视频资料(请查看
  • SimpleMaterial
  • UnlitMaterial
  • OcclusionMaterial
  • VideoMaterial (look at this post to find out how to setup it)

  因此，您可以将以下代码与SimpleMaterial()类一起使用:

  So you can use the following code with a SimpleMaterial() class:

  @IBOutlet var arView: ARView!
  
  let sceneObjects = try! Experience.loadAllMyObjects()
  
  var simpleMaterial = SimpleMaterial()
      
  simpleMaterial.baseColor = try! MaterialColorParameter.texture(
                                            TextureResource.load(named: "img.jpg"))
  
  simpleMaterial.metallic = MaterialScalarParameter(floatLiteral: 0.9)
  simpleMaterial.roughness = MaterialScalarParameter(floatLiteral: 0.1)
  simpleMaterial.tintColor = UIColor.yellow
  
  /*
  
  simpleMaterial.baseColor = MaterialColorParameter.color(UIColor(red: 0.7,
                                                                green: 0.5,
                                                                 blue: 0.2,
                                                                alpha: 1.0))
  */
  

  目前，RealityKit中只有4种方法可以创建简单的3D图元:

  And at the moment there are only 4 methods in RealityKit to create simple 3D primitives:

  • generateBox()
  • generateSphere()
  • generatePlane()
  • generateText()
  • generateBox()
  • generateSphere()
  • generatePlane()
  • generateText()

  所以我们使用其中之一:

  So let's use one of them:

  let mesh: MeshResource = .generateBox(size: 2.5)
  
  let component = ModelComponent(mesh: mesh, 
                            materials: [simpleMaterial])
  
  sceneObjects.components.set(component)
  arView.scene.anchors.append(sceneObjects)
  

  
  

  我们知道在SceneKit中有5种不同的着色模型，因此我们可以使用RealityKit的SimpleMaterial和UnlitMaterial生成我们习惯的所有这五个着色器.

  We know that in SceneKit there are 5 different shading models, so we can use RealityKit's SimpleMaterial and UnlitMaterial to generate all these five shaders that we've been accustomed to.

  让我们看看它的样子:

  SCNMaterial.LightingModel.blinn            –  SimpleMaterial(color: . gray,
                                                           roughness: .float(0.5),
                                                          isMetallic: false)
  
  SCNMaterial.LightingModel.lambert          –  SimpleMaterial(color: . gray,
                                                           roughness: .float(1.0),
                                                          isMetallic: false)
    
  SCNMaterial.LightingModel.phong            –  SimpleMaterial(color: . gray,
                                                           roughness: .float(0.0),
                                                          isMetallic: false)
  
  SCNMaterial.LightingModel.physicallyBased  –  SimpleMaterial(color: . gray,
                                                           roughness: .float(0.0),
                                                          isMetallic: true)
  
  SCNMaterial.LightingModel.constant         –  UnlitMaterial(color: .gray)
  

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