Model I/O importing assets - swift3

Question

I'm trying to use Model I/O as a quicker way to render imported 3d models for my iOS app. I have written a little bit of code importing and displaying a 3d model I have made with a .obj file format. For some reason, when I run my app only a black screen appears.Here is my code:
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()
}
side note: my model is located in the main folder of the app.
Thanks for your help guys!
Noa

Answer 1

I have rendered .Obj model using Model I/O as:
Load model from bundle
NSURL *url = [[NSBundle mainBundle] URLForResource:#"modelName" withExtension:#"obj"];
MDLAsset *asset = [[MDLAsset alloc] initWithURL:url];
MDLMesh *meshObject = (MDLMesh *)[asset objectAtIndex:0];
Apply material to model
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;
}
Add model to scene
SCNNode *baseModelNode = [SCNNode nodeWithMDLObject:object];
[self.sceneView.scene rootNode] addChildNode:self.baseModelNode];
You can set scale and position as per your requirement.