AR core with glb/gltf model using Sceneform

Deepak Rawat

16 June 2023

The 3D model can in the form of GLB or GLTF format and these 3D models can be loaded at runtime without conversion. Which is an improvement in the flexibility of the models rendered in the application.

In this blog, we will be using the GLB format because the GLTF model is dependent on there .bin file which has to be saved with its corresponding file but a GLB file contains a 3D model saved in the GL Transmission Format (glTF). It stores information about a 3D model, such as node hierarchy, cameras, and materials, animations, and meshes in binary format. GLB files are the binary version of .gltf files.

Some important links for the AR model

1:Conversion from .gltf to .glb online :

Copy all the files from the model(.gltf and .bin file) and drag on this link: Click here

2: Conversion from .obj to .glb offline using node.js: Click here

3: To get the sample models: Click here

Let’s get it into code

1. In your project build.gradle dependencies:

1	classpath 'com.android.tools.build:gradle:3.6.3'

2. In your app build.gradle dependencies:

1 2	implementation 'com.google.ar.sceneform.ux:sceneform-ux:1.15.0' implementation 'com.google.ar.sceneform:assets:1.15.0'

3. In the Android Manifest.xml file:

<uses-feature

android:name="android.hardware.camera"

android:required="false" />

<uses-feature

android:name="android.hardware.camera.autofocus"

android:required="false" />

<uses-feature

android:name="android.hardware.camera.ar"

android:required="false" />

<application

android:icon="@mipmap/ic_launcher"

android:label="@string/app_name"

-------

<meta-data

android:name="com.google.ar.core"

android:value="optional" />

</application>

3. Adding ar code on the MainActivity.kt file:

class MainActivity : AppCompatActivity() {

private lateinit var mContentViewBinding: ActivityArBinding

private var arFragment: ArFragment? = null
    private var objectRenderable: ModelRenderable? = null
    private var arModel: String? = null
    private var mModelStateSnackBar: Snackbar? = null
    private lateinit var mModelCompletableFuture: CompletableFuture<Void>
    var anchorNode: AnchorNode? = null
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

arModel = "AR_MODEL_URL"
        if (checkIsSupportedDeviceOrFinish(this)) {
            mContentViewBinding = DataBindingUtil.setContentView(this, R.layout.activity_ar)
            startInitialization()
        } else {
            ToastHelper.showToast(this, getString(R.string.the_ar_feature_is_not_supported_by_your_device))
            this.finish()
        }
    }

private fun startInitialization() {
        try {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
                if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
                    try {

arFragment = supportFragmentManager.findFragmentById(R.id.ux_fragment) as ArFragment

Toast.makeText(this@ArActivity, getString(R.string.downloading_model), Toast.LENGTH_SHORT).show()

// Init renderable
                        loadModel()

// Set tap listener
                        arFragment!!.setOnTapArPlaneListener { hitResult: HitResult, plane: Plane?, motionEvent: MotionEvent? ->
                            val anchor = hitResult.createAnchor()
                            if (anchorNode == null) {
                                anchorNode = AnchorNode(anchor)
                                anchorNode?.setParent(arFragment!!.arSceneView.scene)
                                createModel()
                            }
                        }
                    } catch (e: Exception) {
                        e.printStackTrace()
                    }
                } else {
                    val permissions = arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE)
                    requestPermissions(permissions, RC_AR)
                }
            }
        } catch (e: java.lang.Exception) {
            Log.d("TAG", e.printStackTrace().toString() + e.message.toString())
        }
    }

private fun createModel() {
        try {
            if (anchorNode != null) {
                val node = TransformableNode(arFragment!!.transformationSystem)
                node.scaleController.maxScale = 0.02f
                node.scaleController.minScale = 0.01f
                node.setParent(anchorNode)
                node.renderable = objectRenderable

node.select()
                mModelStateSnackBar = Snackbar.make(mContentViewBinding.arLayout, getString(R.string.model_ready), Snackbar.LENGTH_INDEFINITE).setAction(getString(R.string.dismiss)) {
                    mModelStateSnackBar?.dismiss()
                }
            }
        } catch (e: Exception) {
            Toast.makeText(this@ArActivity, getString(R.string.something_went_wrong), Toast.LENGTH_SHORT).show()

}
    }

@RequiresApi(api = Build.VERSION_CODES.N)
    private fun loadModel() {
        try {
            ModelRenderable.builder()
                    .setSource(this,
                            RenderableSource.builder().setSource(
                                    this,
                                    Uri.parse(arModel),
                                    RenderableSource.SourceType.GLB)/*RenderableSource.SourceType.GLTF2)*/
                                    .setScale(0.75f)
                                    .setRecenterMode(RenderableSource.RecenterMode.ROOT)
                                    .build())
                    .setRegistryId(arModel)
                    .build()
                    .thenAccept { renderable: ModelRenderable ->
                        objectRenderable = renderable
                        Toast.makeText(this@ArActivity, getString(R.string.model_ready), Toast.LENGTH_SHORT).show()

}
                    .exceptionally { throwable: Throwable? ->
                        Log.i("Model", "cant load")
                        mModelStateSnackBar = Snackbar.make(mContentViewBinding.arLayout, getString(R.string.model_error), Snackbar.LENGTH_INDEFINITE).setAction(getString(R.string.try_again)) {
                            mModelStateSnackBar?.dismiss()
                        }
                        null
                    }
        } catch (e: Exception) {
            e.printStackTrace()
        }
    }

private fun checkIsSupportedDeviceOrFinish(activity: Activity): Boolean {
        if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
            Log.e("error", "Sceneform requires Android N or later")
            return false
        }
        val openGlVersionString = (activity.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager)
                .deviceConfigurationInfo
                .glEsVersion
        if (java.lang.Double.parseDouble(openGlVersionString) < MIN_OPENGL_VERSION) {
            Log.e("error", "Sceneform requires OpenGL ES 3.1 later")
            return false
        }
        return true
    }

}

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class MainActivity : AppCompatActivity() {

private lateinit var mContentViewBinding: ActivityArBinding

private var arFragment: ArFragment? = null

private var objectRenderable: ModelRenderable? = null

private var arModel: String? = null

private var mModelStateSnackBar: Snackbar? = null

private lateinit var mModelCompletableFuture: CompletableFuture<Void>

var anchorNode: AnchorNode? = null

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

arModel = "AR_MODEL_URL"

if (checkIsSupportedDeviceOrFinish(this)) {

mContentViewBinding = DataBindingUtil.setContentView(this, R.layout.activity_ar)

startInitialization()

} else {

ToastHelper.showToast(this, getString(R.string.the_ar_feature_is_not_supported_by_your_device))

this.finish()

}

private fun startInitialization() {

try {

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {

if (ContextCompat.checkSelfPermission(this, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(this, Manifest.permission.READ_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {

try {

arFragment = supportFragmentManager.findFragmentById(R.id.ux_fragment) as ArFragment

Toast.makeText(this@ArActivity, getString(R.string.downloading_model), Toast.LENGTH_SHORT).show()

// Init renderable

loadModel()

// Set tap listener

arFragment!!.setOnTapArPlaneListener { hitResult: HitResult, plane: Plane?, motionEvent: MotionEvent? ->

val anchor = hitResult.createAnchor()

if (anchorNode == null) {

anchorNode = AnchorNode(anchor)

anchorNode?.setParent(arFragment!!.arSceneView.scene)

createModel()

}

} catch (e: Exception) {

e.printStackTrace()

}

} else {

val permissions = arrayOf(Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE)

requestPermissions(permissions, RC_AR)

}

} catch (e: java.lang.Exception) {

Log.d("TAG", e.printStackTrace().toString() + e.message.toString())

}

private fun createModel() {

try {

if (anchorNode != null) {

val node = TransformableNode(arFragment!!.transformationSystem)

node.scaleController.maxScale = 0.02f

node.scaleController.minScale = 0.01f

node.setParent(anchorNode)

node.renderable = objectRenderable

node.select()

mModelStateSnackBar = Snackbar.make(mContentViewBinding.arLayout, getString(R.string.model_ready), Snackbar.LENGTH_INDEFINITE).setAction(getString(R.string.dismiss)) {

mModelStateSnackBar?.dismiss()

}

} catch (e: Exception) {

Toast.makeText(this@ArActivity, getString(R.string.something_went_wrong), Toast.LENGTH_SHORT).show()

}

@RequiresApi(api = Build.VERSION_CODES.N)

private fun loadModel() {

try {

ModelRenderable.builder()

.setSource(this,

RenderableSource.builder().setSource(

this,

Uri.parse(arModel),

RenderableSource.SourceType.GLB)/*RenderableSource.SourceType.GLTF2)*/

.setScale(0.75f)

.setRecenterMode(RenderableSource.RecenterMode.ROOT)

.build())

.setRegistryId(arModel)

.build()

.thenAccept { renderable: ModelRenderable ->

objectRenderable = renderable

Toast.makeText(this@ArActivity, getString(R.string.model_ready), Toast.LENGTH_SHORT).show()

}

.exceptionally { throwable: Throwable? ->

Log.i("Model", "cant load")

mModelStateSnackBar = Snackbar.make(mContentViewBinding.arLayout, getString(R.string.model_error), Snackbar.LENGTH_INDEFINITE).setAction(getString(R.string.try_again)) {

mModelStateSnackBar?.dismiss()

}

null

}

} catch (e: Exception) {

e.printStackTrace()

}

private fun checkIsSupportedDeviceOrFinish(activity: Activity): Boolean {

if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {

Log.e("error", "Sceneform requires Android N or later")

return false

}

val openGlVersionString = (activity.getSystemService(Context.ACTIVITY_SERVICE) as ActivityManager)

.deviceConfigurationInfo

.glEsVersion

if (java.lang.Double.parseDouble(openGlVersionString) < MIN_OPENGL_VERSION) {

Log.e("error", "Sceneform requires OpenGL ES 3.1 later")

return false

}

return true

}

4. Let’s add the scene form ArFragment on the layout code of activity_ar.xml code:

<layout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto">

<RelativeLayout

android:id="@+id/ar_layout"

android:layout_width="match_parent"

android:layout_height="match_parent">

<fragment

android:id="@+id/ux_fragment"

android:name="com.google.ar.sceneform.ux.ArFragment"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:layout_below="@id/toolbar"

android:tag="ar_fragment" />

</RelativeLayout>

</layout>

Now you just have to pass the .glb/.gltf model URL on the “arModel” string. Now just run your app.

. . . . . . . . . .

That’s it from my side for today, thanks for reading it until now.