MainActivity.kt

/**
     * Used to laod models from 'raw' with a callback when loading is complete
     */
    fun loadModel(@RawRes model: Int, callback: (ModelRenderable) -> Unit) {
        ModelRenderable
            .builder()
            .setSource(this, model)
            .build()
            .thenAccept { modelRenderable ->
                callback(modelRenderable)
            }
    }