如何为 .glb 文件 Sceneform ARCore 的可渲染实例提供材质

如何解决如何为 .glb 文件 Sceneform ARCore 的可渲染实例提供材质

在生成 .glb 文件的 ModelRenderable 实例后，我曾尝试为材质赋予颜色，但它抛出错误 "java.util.concurrent.CompletionException: java.lang.IllegalArgumentException: submeshIndex ( 0) 超出范围。它必须小于 submeshCount (0)" 但同样适用于 .sfb 的 ModelRenderable 实例，请参阅下面的代码，我不知道如何处理这种情况。

ModelRenderable.builder()
                    .setSource(context,Uri.parse("redMarker.glb"))
                    .setIsFilamentGltf(true)
                    .build()
                    .thenAccept { renderable ->
                        pointy4Cursor = renderable
                    }
                    .exceptionally {
                        Log.e(TAG,"unable to load renderable pointy4Cursor  - " + it.toString())
                        val toast = Toast.makeText(context,"Unable to load renderable new model 6",Toast.LENGTH_LONG)
                        toast.setGravity(Gravity.CENTER,0)
                        toast.show()
                        null
                    },MaterialFactory.makeOpaqueWithColor(context,Color(context.getColor(R.color.colorSecondary)))
                    .thenAccept {
                        navaPink = it
                    }
                    .exceptionally {
                        Log.e(TAG,"unable to load material navaPink")
                        val toast = Toast.makeText(context,"Unable to load material",pointy4Cursor.material = navaPink // It's throwing exception as define above. 

请帮忙

解决方法

我假设您使用的是 Sceneform 1.16 版，因为可以加载 GLB 模型？

您的问题是已知问题，如您所见here、here 或 here。

这里可能的解决方法是使用您可以在 Sceneform 1.16 中获得的 filamentAsset。 你可以这样得到：

private void addModel (Anchor anchor,ModelRenderable modelRenderable){
            // Creating a AnchorNode with a specific anchor
            AnchorNode anchorNode = new AnchorNode(anchor);

            // attaching the anchorNode with the ArFragment
            anchorNode.setParent(arCam.getArSceneView().getScene());

            // attaching the anchorNode with the TransformableNode
            TransformableNode model = new TransformableNode(arCam.getTransformationSystem());
            model.setParent(anchorNode);

            // attaching the 3d model with the TransformableNode
            // that is already attached with the node
            model.setRenderable(modelRenderable);
            model.select();

            // Saving the object as filament asset
            // -> Possibility to run animations and change textures
            filamentAsset = model.getRenderableInstance().getFilamentAsset();
        }

该函数可以在 ModelRenderable.builder() 内部调用，例如：

ModelRenderable.builder()
                            .setSource(this,R.raw.avocado)
                            .setIsFilamentGltf(true)
                            .build()
                            .thenAccept(modelRenderable -> addModel(anchor,modelRenderable))
                            .exceptionally(throwable -> {
                                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                                builder.setMessage("Somthing is not right" + throwable.getMessage()).show();
                                return null;
                            });

当您将 filamentAsset 保存到变量时，您可以访问 MaterialInstances 并设置参数：

public void changeMaterials () {
            MaterialInstance[] materialInstances = filamentAsset.getMaterialInstances();

            TextureSampler textureSampler = new TextureSampler();

            for (MaterialInstance materialInstance : materialInstances) {
                if (materialInstance.getName() == "example_name") {
                    materialInstance.setParameter("baseColorFactor",0.3f,0.5f,0.7f); // Values for Red,Green and Blue
                }
            }
        }

您可以设置哪些值，您可以看到 here。

希望这能解决您的问题！