Roompaln wall group objects apply texture

I am writing to seek assistance with a challenge I am facing while working on a 3D model rendering project. I believe your expertise in this area could be immensely helpful in resolving the issue.

The problem I am encountering involves difficulties in displaying textures on both parent and child nodes within the 3D model. Here are the key details of the problem:

1. This model contents wall_grp(doors, windows and wall) objects. We are using roomplan data in SCNView.
2. This code dependent on scene kit and room plan apis
3. When we are comment childnode code its working but in this case we don’t have windows and door on wall.

func updateWallObjects() {
        if arch_grp.count > 0 {
            if !arch_grp.isEmpty {
                for obj in arch_grp[0].childNodes {
                    let color = UIColor.init(red: 255/255, green: 229/255, blue: 204/255, alpha: 1.0)
                    let parentNode = obj.flattenedClone()
                    for childObj in obj.childNodes {
                        let childNode = childObj.flattenedClone()
                        let childMaterial = SCNMaterial()
                        childNode.geometry?.materials = [childMaterial]
                        if let name = childObj.name {
                            if (removeNumbers(from: name) != "Wall") {
                                childNode.geometry?.firstMaterial?.diffuse.contents =   UIColor.white
                            } else {
                                childNode.geometry?.firstMaterial?.diffuse.contents =   color
                            }
                        }
                        childObj.removeFromParentNode()
                        parentNode.addChildNode(childObj)
                    }
                    let material = SCNMaterial()
                    parentNode.geometry?.materials = [material]
                    parentNode.geometry?.firstMaterial?.diffuse.contents = color
                    obj.removeFromParentNode()
                    arch_grp[0].addChildNode(parentNode)
                }
            }
        }
    }```
Please suggest us