Apply proper finishes on obj model in scenekit?

Question

I am trying to apply metalness map on .obj Model using scenekit (ARIkit iOS). Unfortunately, It's displaying vertical lines.

Please refer below code and also, I have attached screenshot for proper understanding.

Model is UV unwrapped to resolve tiling issue in the model, and all materials are attached for review purpose.

Obj URL : https://s3.ap-south-1.amazonaws.com/p9-platform/product/4f800e4c-52cd-4167-a7c3-6ba5703df7e7.obj

func loadTexture(forMaterial material: SCNMaterial, withFinish finish:FinishModel, forDispatchGroup disPatchGroup:DispatchGroup) {

    concurrentQueue.async {
        if material.lightingModel != .physicallyBased {
            material.lightingModel = .physicallyBased
        }
    }
    if let finishMap = finish.finishMap {
      if let diffuseTexturePath = finishMap.diffuseMapUrl {
            disPatchGroup.enter()
            self.dataProvider.fetchTextureFile(forpath: diffuseTexturePath, successBlock: { (success, imageObject) in
                //self.viewController?.report_memory()
                material.diffuse.contents = nil
                material.diffuse.contents = imageObject
                disPatchGroup.leave()
            }, failureBlock: { (error) in
                disPatchGroup.leave()
            })
        }

       if let metalTexturePath = finishMap.metalnessMapUrl {
            disPatchGroup.enter()
            self.dataProvider.fetchTextureFile(forpath: metalTexturePath, successBlock: { (success, imageObject) in
               // self.viewController?.report_memory()
               material.metalness.contents = nil
                material.metalness.contents = imageObject
                disPatchGroup.leave()
            }, failureBlock: { (error) in
                disPatchGroup.leave()
            })
        }

        if let roughnessTexturePath = finishMap.roughnessMapUrl {
            disPatchGroup.enter()
            self.dataProvider.fetchTextureFile(forpath: roughnessTexturePath, successBlock: { (success, imageObject) in
               // self.viewController?.report_memory()
                material.roughness.contents = nil
                material.roughness.contents = imageObject
                disPatchGroup.leave()
            }, failureBlock: { (error) in
                disPatchGroup.leave()
            })
        }

        if let normalTexturePath = finishMap.normalMapUrl {
            disPatchGroup.enter()
            self.dataProvider.fetchTextureFile(forpath: normalTexturePath, successBlock: { (success, imageObject) in
                material.normal.contents = nil
               // self.viewController?.report_memory()
                material.normal.contents = imageObject
                disPatchGroup.leave()
            }, failureBlock: { (error) in
                disPatchGroup.leave()
            })
        }

    }
}

DiffuseMapUrl

NormalMapUrl

metalnessMapUrl

roughnessMapUrl

Answer 1

You should make sure the different material properties ( diffuse , metalness , roughness and normal ) use the same wrap mode for wrapS and wrapT . Here SCNWrapModeRepeat is likely what you are looking for.

Note The code in the question sets the specular material property, but SCNLightingModelPhysicallyBased does not take it into account.