sceneconverter: adapt tests to GltfImporter and SceneConverter changes.

src/Magnum/SceneTools/Test/CMakeLists.txt

@@ -138,6 +138,7 @@ if(CORRADE_TARGET_UNIX AND NOT CORRADE_PLUGINMANAGER_NO_DYNAMIC_PLUGIN_SUPPORT)
             SceneConverterTestFiles/two-quads.gltf
             SceneConverterTestFiles/two-triangles-transformed.bin
             SceneConverterTestFiles/two-triangles-transformed.gltf
+            SceneConverterTestFiles/two-triangles-transformed-no-default-scene.gltf
             SceneConverterTestFiles/two-triangles.obj)
     target_include_directories(SceneToolsSceneConverterTest PRIVATE ${CMAKE_CURRENT_BINARY_DIR}/$<CONFIG>)
     if(MAGNUM_WITH_SCENECONVERTER)

src/Magnum/SceneTools/Test/SceneConverterTest.cpp

@@ -176,6 +176,12 @@ const struct {
         "GltfImporter", nullptr, "StanfordSceneConverter", {}, nullptr,
         "quad-duplicates.ply", nullptr,
         {}},
+    {"concatenate meshes with a scene but no default scene", Containers::array<Containers::String>({
+        "--concatenate-meshes",
+        Utility::Path::join(SCENETOOLS_TEST_DIR, "SceneConverterTestFiles/two-triangles-transformed-no-default-scene.gltf"), Utility::Path::join(SCENETOOLS_TEST_OUTPUT_DIR, "SceneConverterTestFiles/quad-duplicates.ply")}),
+        "GltfImporter", nullptr, "StanfordSceneConverter", {}, nullptr,
+        "quad-duplicates.ply", nullptr,
+        {}},
     /** @todo drop --mesh once it's not needed anymore again, then add a
         multi-mesh variant */
     {"one mesh, filter mesh attributes", Containers::array<Containers::String>({

src/Magnum/SceneTools/Test/SceneConverterTestFiles/images-3d-1x1x1.gltf

@@ -26,8 +26,17 @@
       "byteLength": 255
     }
   ],
+  "samplers": [
+    {
+      "wrapS": 10497,
+      "wrapT": 10497,
+      "minFilter": 9987,
+      "magFilter": 9729
+    }
+  ],
   "textures": [
     {
+      "sampler": 0,
       "extensions": {
         "KHR_texture_ktx": {
           "source": 0,
@@ -36,6 +45,7 @@
       }
     },
     {
+      "sampler": 0,
       "extensions": {
         "KHR_texture_ktx": {
           "source": 1,

src/Magnum/SceneTools/Test/SceneConverterTestFiles/two-triangles-transformed-no-default-scene.gltf

@@ -0,0 +1,75 @@
+{
+  "asset": {
+    "version": "2.0"
+  },
+  "buffers": [
+    {
+      "uri": "two-triangles-transformed.bin",
+      "byteLength": 72
+    }
+  ],
+  "bufferViews": [
+    {
+      "buffer": 0,
+      "byteLength": 36
+    },
+    {
+      "buffer": 0,
+      "byteOffset": 36,
+      "byteLength": 36
+    }
+  ],
+  "accessors": [
+    {
+      "bufferView": 0,
+      "componentType": 5126,
+      "count": 3,
+      "type": "VEC3"
+    },
+    {
+      "bufferView": 1,
+      "componentType": 5126,
+      "count": 3,
+      "type": "VEC3"
+    }
+  ],
+  "meshes": [
+    {
+      "primitives": [
+        {
+          "attributes": {
+            "POSITION": 0
+          }
+        }
+      ]
+    },
+    {
+      "primitives": [
+        {
+          "attributes": {
+            "POSITION": 1
+          }
+        }
+      ]
+    }
+  ],
+  "nodes": [
+    {
+      "mesh": 0
+    },
+    {
+      "name": "Explicit intermediate node to test proper traversal",
+      "translation": [0, -5, 0],
+      "children": [2]
+    },
+    {
+      "mesh": 1,
+      "translation": [0, -5, 0]
+    }
+  ],
+  "scenes": [
+    {
+      "nodes": [0, 1]
+    }
+  ]
+}

src/Magnum/SceneTools/Test/SceneConverterTestFiles/two-triangles-transformed.gltf

@@ -71,5 +71,6 @@
     {
       "nodes": [0, 1]
     }
-  ]
+  ],
+  "scene": 0
 }

src/Magnum/SceneTools/sceneconverter.cpp

@@ -621,13 +621,16 @@ well, the IDs reference attributes of the first mesh.)")
 
             /* If there's a scene, use it to flatten mesh hierarchy. If not,
                assume all meshes are in the root. */
-            /** @todo make it possible to choose the scene */
-            if(importer->defaultScene() != -1) {
+            if(importer->defaultScene() != -1 || importer->sceneCount()) {
                 Containers::Optional<Trade::SceneData> scene;
                 {
+                    /** @todo make it possible to choose the scene, or possibly
+                        fail if there are multiple scenes but no default one
+                        and require the user to pick? */
+                    const UnsignedInt defaultScene = importer->defaultScene() == -1 ? 0 : importer->defaultScene();
                     Trade::Implementation::Duration d{importConversionTime};
-                    if(!(scene = importer->scene(importer->defaultScene()))) {
-                        Error{} << "Cannot import scene" << importer->defaultScene() << "for mesh concatenation";
+                    if(!(scene = importer->scene(defaultScene))) {
+                        Error{} << "Cannot import scene" << defaultScene << "for mesh concatenation";
                         return 1;
                     }
                 }