Merge pull request #2550 from merwaaan/fix-obj-line-continuation

Fix line continuations in OBJ files

code/Obj/ObjFileParser.cpp

@@ -118,7 +118,7 @@ void ObjFileParser::parseFile( IOStreamBuffer<char> &streamBuffer ) {
     size_t lastFilePos( 0 );
 
     std::vector<char> buffer;
-    while ( streamBuffer.getNextDataLine( buffer, '\0' ) ) {
+    while ( streamBuffer.getNextDataLine( buffer, '\\' ) ) {
         m_DataIt = buffer.begin();
         m_DataItEnd = buffer.end();
 

test/unit/utObjImportExport.cpp

@@ -448,3 +448,37 @@ TEST_F(utObjImportExport, import_without_linend) {
     const aiScene *scene = myImporter.ReadFile(ASSIMP_TEST_MODELS_DIR "/OBJ/box_without_lineending.obj", 0);
     ASSERT_NE(nullptr, scene);
 }
+
+TEST_F(utObjImportExport, import_with_line_continuations) {
+    static const char *ObjModel =
+        "v -0.5 -0.5 0.5\n"
+        "v -0.5 \\\n"
+        "  -0.5 -0.5\n"
+        "v -0.5 \\\n"
+        "   0.5 \\\n"
+        "   -0.5\n"
+        "f 1 2 3\n";
+
+    Assimp::Importer myImporter;
+    const aiScene *scene = myImporter.ReadFileFromMemory(ObjModel, strlen(ObjModel), 0);
+    EXPECT_NE(nullptr, scene);
+
+    EXPECT_EQ(scene->mNumMeshes, 1U);
+    EXPECT_EQ(scene->mMeshes[0]->mNumVertices, 3U);
+    EXPECT_EQ(scene->mMeshes[0]->mNumFaces, 1U);
+
+    auto vertices = scene->mMeshes[0]->mVertices;
+    const float threshold = 0.0001f;
+
+    EXPECT_NEAR(vertices[0].x, -0.5f, threshold);
+    EXPECT_NEAR(vertices[0].y, -0.5f, threshold);
+    EXPECT_NEAR(vertices[0].z, 0.5f, threshold);
+
+    EXPECT_NEAR(vertices[1].x, -0.5f, threshold);
+    EXPECT_NEAR(vertices[1].y, -0.5f, threshold);
+    EXPECT_NEAR(vertices[1].z, -0.5f, threshold);
+
+    EXPECT_NEAR(vertices[2].x, -0.5f, threshold);
+    EXPECT_NEAR(vertices[2].y, 0.5f, threshold);
+    EXPECT_NEAR(vertices[2].z, -0.5f, threshold);
+}