模型I / O导入资产

Question

我正在尝试使用Model I / O作为为我的iOS应用渲染导入的3D模型的更快捷方式。我编写了一些代码导入并显示了我用.obj文件格式制作的3D模型。出于某种原因，当我运行我的应用程序时，只出现黑屏。这是我的代码：

import UIKit
import ModelIO
import SceneKit
import SceneKit.ModelIO

class ViewController: UIViewController {


var sceneView: SCNView {
    return self.view as! SCNView
}

override func viewDidLoad() {
     // Do any additional setup after loading the view, typically from                a nib.
    guard let url = Bundle.main.url(forResource: "Digestive_System",      withExtension: "obj") else {
        fatalError("Failed to find model")

    }

    //Load Object
    let asset = MDLAsset(url:url)
    guard let object = asset.object(at: 0) as? MDLMesh else {
        fatalError("failed to get mesh from asset")
    }

    // Wrap Model I/O object in SceneKit object
    let scene = SCNScene()
    let node = SCNNode(mdlObject: object)
    scene.rootNode.addChildNode(node)


    //Display Scene

    sceneView.autoenablesDefaultLighting = true
    sceneView.allowsCameraControl = true
    sceneView.scene = scene
    sceneView.backgroundColor = UIColor.black








     super.viewDidLoad()
     }

旁注：我的模型位于应用程序的主文件夹中。

谢谢你的帮助！诺亚

Answer 1

我使用Model I / O渲染.Obj模型：

1. 从bundle加载模型

   NSURL *url = [[NSBundle mainBundle] URLForResource:@"modelName" withExtension:@"obj"];
   MDLAsset *asset = [[MDLAsset alloc] initWithURL:url];
   MDLMesh *meshObject = (MDLMesh *)[asset objectAtIndex:0];

2. 将材料应用于模型

   MDLScatteringFunction *scattering = [MDLScatteringFunction new];
   MDLMaterial *mdMaterial = [[MDLMaterial alloc] initWithName:@"material" 
   scatteringFunction:scattering];
   
   NSURL *baseMaterialURL = [[NSBundle mainBundle] 
   URLForResource:@"Image_Base_Color" withExtension:@"png"];
   MDLMaterialProperty *baseColor = [MDLMaterialProperty new];
   [baseColor setType:MDLMaterialPropertyTypeTexture];
   [baseColor setSemantic:MDLMaterialSemanticBaseColor];
   [baseColour setURLValue:baseMaterialURL];
   [material setProperty:baseColor];
   
    for(MDLSubmesh *subMesh in meshObject.submeshes)
    {
       sub.material = material;
    }

3. 将模型添加到场景中

    SCNNode *baseModelNode = [SCNNode nodeWithMDLObject:object];
    [self.sceneView.scene rootNode] addChildNode:self.baseModelNode];

您可以根据需要设置比例和位置。