this function builds and loads the model from firebase and saves it into a variable

RenderObject.kt

  private fun renderObject() {

        ModelRenderable.builder()
                .setSource(
                        requireContext(), builder().setSource(
                        requireContext(),
                        Uri.parse(link),
                        SourceType.GLB
                )
                        .setRecenterMode(RecenterMode.ROOT)
                        .build()

                )
                .setRegistryId(link)
                .build()
                .thenAccept { modelRenderable: ModelRenderable ->


                    model= modelRenderable
                    onRenderableLoaded(model)
                }
                .exceptionally { throwable: Throwable? ->
                    val message: String = if (throwable is CompletionException) {

                        "Internet is not working"
                    } else {

                        "Can't load Model"
                    }
                    val mainHandler = Handler(Looper.getMainLooper())
                    val finalMessage: String = message
                    val myRunnable = Runnable {
                        AlertDialog.Builder(requireContext())
                                .setTitle("Error")
                                .setMessage(finalMessage + "")
                                .setPositiveButton("Retry") { dialogInterface: DialogInterface, _: Int ->
                                    renderObject()
                                    dialogInterface.dismiss()
                                }
                                .setNegativeButton("Cancel") { dialogInterface, _ -> dialogInterface.dismiss() }
                                .show()
                    }
                    mainHandler.post(myRunnable)
                    null
                }
    }