feat(node): view a device's 3D model, and place it in AR on the google flavor

androidApp/build.gradle.kts

@@ -270,6 +270,10 @@ dependencies {
 
     googleImplementation(libs.location.services)
     googleImplementation(libs.play.services.maps)
+    // ARCore for the device model viewer; proprietary, so google only. Same exclusions as feature/node's sceneview.
+    googleImplementation("io.github.sceneview:arsceneview:${libs.versions.sceneview.get()}") {
+        exclude(group = "org.jetbrains.kotlin", module = "kotlin-android-extensions-runtime")
+    }
     googleImplementation(libs.maps.compose)
     googleImplementation(libs.maps.compose.utils)
     googleImplementation(libs.maps.compose.widgets)

androidApp/src/fdroid/kotlin/org/meshtastic/app/node/DeviceModelArViewer.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2026 Meshtastic LLC
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.meshtastic.app.node
+
+import org.meshtastic.core.ui.util.DeviceModelArViewer
+
+/** ARCore is proprietary, so the fdroid flavor has no AR viewer and the action never shows. */
+val deviceModelArViewer: DeviceModelArViewer? = null

androidApp/src/google/kotlin/org/meshtastic/app/node/ArCapture.kt

@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2026 Meshtastic LLC
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+package org.meshtastic.app.node
+
+import android.content.ContentValues
+import android.content.Context
+import android.graphics.Bitmap
+import android.net.Uri
+import android.os.Build
+import android.os.Handler
+import android.os.Looper
+import android.provider.MediaStore
+import android.view.PixelCopy
+import android.view.SurfaceView
+import android.view.View
+import android.view.ViewGroup
+import androidx.annotation.RequiresApi
+import androidx.core.view.children
+import kotlinx.coroutines.CoroutineDispatcher
+import kotlinx.coroutines.suspendCancellableCoroutine
+import kotlinx.coroutines.withContext
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
+import kotlin.coroutines.resume
+
+private const val PICTURES_RELATIVE_PATH = "Pictures/Meshtastic"
+private const val JPEG_QUALITY = 92
+
+/**
+ * Copies the AR view's GL surface into Pictures/Meshtastic: the camera feed and the model, none of the Compose controls
+ * drawn over it. The scene renders every camera frame, so the surface is never stale. Null when nothing was saved.
+ */
+@RequiresApi(Build.VERSION_CODES.Q)
+internal suspend fun captureArScene(root: View, title: String, io: CoroutineDispatcher): Uri? {
+    val surface = root.findSurfaceView()?.takeIf { it.width > 0 && it.height > 0 } ?: return null
+    val bitmap = Bitmap.createBitmap(surface.width, surface.height, Bitmap.Config.ARGB_8888)
+    val copied = suspendCancellableCoroutine { continuation ->
+        PixelCopy.request(
+            surface,
+            bitmap,
+            { result -> continuation.resume(result == PixelCopy.SUCCESS) },
+            Handler(Looper.getMainLooper()),
+        )
+    }
+    return if (copied) withContext(io) { saveToPictures(root.context, bitmap, title) } else null
+}
+
+private fun View.findSurfaceView(): SurfaceView? = when (this) {
+    is SurfaceView -> this
+    is ViewGroup -> children.firstNotNullOfOrNull { it.findSurfaceView() }
+    else -> null
+}
+
+@RequiresApi(Build.VERSION_CODES.Q)
+private fun saveToPictures(context: Context, bitmap: Bitmap, title: String): Uri? {
+    val resolver = context.contentResolver
+    val stamp = SimpleDateFormat("yyyyMMdd-HHmmss", Locale.US).format(Date())
+    val name = "${title.replace(Regex("[^A-Za-z0-9]+"), "-").trim('-')}-$stamp.jpg"
+    val pending =
+        ContentValues().apply {
+            put(MediaStore.Images.Media.DISPLAY_NAME, name)
+            put(MediaStore.Images.Media.MIME_TYPE, "image/jpeg")
+            put(MediaStore.Images.Media.RELATIVE_PATH, PICTURES_RELATIVE_PATH)
+            put(MediaStore.Images.Media.IS_PENDING, 1)
+        }
+    val uri = resolver.insert(MediaStore.Images.Media.getContentUri(MediaStore.VOLUME_EXTERNAL_PRIMARY), pending)
+    val written =
+        uri != null &&
+            runCatching {
+                resolver.openOutputStream(uri)?.use { bitmap.compress(Bitmap.CompressFormat.JPEG, JPEG_QUALITY, it) }
+            }
+                .getOrNull() == true
+    // A row left pending would sit hidden in the gallery, so a failed write removes it.
+    if (written) {
+        resolver.update(uri, ContentValues().apply { put(MediaStore.Images.Media.IS_PENDING, 0) }, null, null)
+    } else if (uri != null) {
+        resolver.delete(uri, null, null)
+    }
+    return uri.takeIf { written }
+}