How to add a simple node in earth using compose?

[renatojobal]

I have a simple composable and am trying to add a 3D model to an anchor by creating an anchor node using earth.createAnchor. Apparently, the model is added and attached, but I can't see it. Since I am using DepthMode.Disable, I assume I should be able to see the model regardless of any physical objects in front of the camera. But I can't see it 😢

@Composable
fun Sample() {
    Box(
        modifier = Modifier
            .fillMaxSize()
            .safeDrawingPadding()
    ) {

        val currentScope = rememberCoroutineScope()

        // Core Filament/SceneView objects.
        val engine: Engine = rememberEngine()
        val modelLoader: ModelLoader = rememberModelLoader(engine = engine)
        val childNodes: MutableList<Node> = rememberNodes()

        // State variables for AR configuration and tracking.
        val earth = remember { mutableStateOf<Earth?>(null) }
        val latitude = remember { mutableStateOf<Double?>(null) }
        val longitude = remember { mutableStateOf<Double?>(null) }
        val altitude = remember { mutableStateOf<Double?>(null) }

        // Store the ARCore Session for later use.
        val arSession = remember { mutableStateOf<Session?>(null) }

        // Asset info.
        val modelAsset = "models/simple_satellite.glb"
        val modelScale = 10f


        ARScene(
            modifier = Modifier.fillMaxSize(),
            engine = engine,
            modelLoader = modelLoader,
            sessionFeatures = setOf(),
            sessionCameraConfig = null,
            sessionConfiguration = { session, config ->
                config.depthMode = Config.DepthMode.DISABLED
                config.instantPlacementMode = Config.InstantPlacementMode.LOCAL_Y_UP
                config.lightEstimationMode = Config.LightEstimationMode.ENVIRONMENTAL_HDR
                config.geospatialMode = Config.GeospatialMode.ENABLED
                config.semanticMode = Config.SemanticMode.ENABLED

            },
            planeRenderer = true,
            childNodes = childNodes,
            onSessionCreated = { session ->


            },

            )


        Button(onClick = {
            currentScope.launch {
                // Wait until tracking is active.
                while (earth.value?.trackingState != TrackingState.TRACKING) {
                    delay(1000)
                }
                val session = arSession.value
                if (session == null) {
                    Log.e("Sample", "AR Session is not available.")
                    return@launch
                }

                // Create an anchor using the Pose.
                try {
                    val anchor = earth.value?.createAnchor(
                        latitude.value!!, longitude.value!!, altitude.value!!, 0f, 0f, 0f, 1f
                    )

                    anchor?.let {

                        // Create an AnchorNode with the created anchor.
                        val anchorNode = AnchorNode(engine = engine, anchor = anchor)

                        // Create the ModelNode for the satellite model.
                        val satelliteNode = ModelNode(
                            modelInstance = modelLoader.createModelInstance(
                                assetFileLocation = modelAsset
                            ), scaleToUnits = modelScale, centerOrigin = Position(0f, 0f, 0f)
                        )

                        // Attach the ModelNode as a child of the AnchorNode
                        anchorNode.addChildNode(satelliteNode)

                        // Add the AnchorNode to debug value
                        childNodes.add(anchorNode)

                    }
                } catch (e: NotTrackingException) {
                    Log.e("Sample", "Error creating anchor: ${e.message}")
                } catch (e: NullPointerException) {
                    Log.e("Sample", "Error creating anchor: ${e.message}")
                }
            }
        }) {
            Text("Add Satellite Model")
        }

    }
}

can some one help me with this please? It works when instead of using earth.createAnchor I use scene.createAnchor? Is there is step I am missing?

[GVAMDaniel]

Hi, I just wanted to ask you, did you manage to visualize the model in the earth anchor?
I'm having the same problem

[renatojobal]

Yeah, finally I were able to visualize the object, the problem I had was that the scale of the model was to much, when I reduced the scale I were able to see the model