Question

我尝试使用模型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。

感谢您的帮助！ NOA

Answer 1

我已经使用Model I / O渲染了.Obj模型：

从捆绑包加载模型

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

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;
 }

将模型添加到场景

 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。

模型I / O导入资产

1 个答案: