如何获得glb模型中材料的位置？

如何解决如何获得glb模型中材料的位置？

我正在尝试获取模型中材料的位置，并且一直在使用一些代码进行探索：

    ModelRenderable.builder()
            .setSource(context,R.raw.andy)
            .build()
            .thenAccept { andyRenderable ->
                for (index in 0 until 9999) {
                    try {
                        val material = andyRenderable.getMaterial(index)
                        Log.d("tag","material " + material.filamentMaterialInstance.name + " at index " + index.toString())
                        Log.d("tag",material.filamentMaterialInstance.material.parameters.toString())

                    } catch (e: Exception) {
                        Log.d("tag","exception: " + e.toString())
                        break
                    }
                }
            }
            .exceptionally(
                    Function<Throwable,Void?> { throwable: Throwable? ->
                        val toast: Toast = Toast.makeText(this,"Unable to load andy renderable",Toast.LENGTH_LONG)
                        toast.setGravity(Gravity.CENTER,0)
                        toast.show()
                        null
                    })

但是，第一个索引 [0] 导致 java.lang.IllegalArgumentException: submeshIndex (0) is out of range. It must be less than the submeshCount (0).

是否有可能获得材料的位置？