Xcode:如何通过编程使模型上的金属部分看起来真实

Question

我是Scenekit的新手。现在我正在尝试显示一个带有一些金属零件的3D模型

myNode?.geometry?.firstMaterial?.diffuse.contents = UIImage(named: "albedo.jpg")
//... same with metallic map, normal map, roughness map ...

金属部件呈现纯白色。我应该如何解决这个问题？

Answer 1

感谢Warren的回复。

看来

myView.scene?.lightingEnvironment.contents = ...

就是我想要的。

诀窍是设置适当的背景，这样我们就可以在金属零件上看到逼真的反射。我使用的方式不对

scene.background.contents = ...

Answer 2

scene.background.contents = UIImage(named: "background.jpg")
scene.lightingEnvironment.contents = UIImage(named: "env.hdr")
scene.lightingEnvironment.intensity = 3
let material = SCNMaterial()
material.lightingModel = .physicallyBased
material.diffuse.contents = UIImage(named: "albedo.jpg")
material.metalness.contents = UIImage(named: "metalness.jpg")
material.roughness.contents = UIImage(named: "roughness.jpg")
material.metalness.intensity = 0.5
material.roughness.intensity = 1.0
// YOU CAN ASSIGN ALL THE MATERIALS AT ONCE
node.geometry?.materials = [material]