irajsb
commented
1 year ago void UAIScene::EmptySceneTestExport()
{
// Creating a test scene
std::unique_ptr<aiScene> scene(new aiScene());
// TODO: Fill the scene with data (meshes, materials, etc.)
aiMesh *mesh = new aiMesh();
mesh->mNumVertices = 3;
mesh->mVertices = new aiVector3D [] {{0,0,0}, {0,1,0}, {1,0,0}};
mesh->mNumFaces = 1;
mesh->mFaces = new aiFace[1];
mesh->mFaces[0].mNumIndices = 3;
mesh->mFaces[0].mIndices = new unsigned[] { 0, 1, 2 };
mesh->mPrimitiveTypes = aiPrimitiveType_TRIANGLE; // workaround, issue #3778
scene->mNumMeshes = 1;
scene->mMeshes = new aiMesh * [] { mesh };
scene->mNumMaterials = 1;
scene->mMaterials = new aiMaterial * [] { new aiMaterial() };
scene->mRootNode = new aiNode();
scene->mRootNode->mNumMeshes = 1;
scene->mRootNode->mMeshes = new unsigned [] { 0 };
scene->mMetaData = new aiMetadata(); // workaround, issue #3781
// Creating an exporter
// Constructing the export path
FString ExportPath = FPaths::ProjectDir();
ExportPath=FPaths::Combine(ExportPath,"Export");
ExportPath=FPaths::ConvertRelativePathToFull(ExportPath);
if (!FPlatformFileManager::Get().GetPlatformFile().DirectoryExists(*ExportPath))
{
FPlatformFileManager::Get().GetPlatformFile().CreateDirectory(*ExportPath);
}
ExportPath =FPaths::Combine(ExportPath,"Test.obj");
Assimp::Exporter exporter;
// Exporting the scene
if (exporter.Export(scene.get(), "obj", TCHAR_TO_ANSI(*ExportPath)) != AI_SUCCESS)
{
UE_LOG(LogAssimp, Fatal, TEXT("Exporting scene to fbx failed: %s"), ANSI_TO_TCHAR(exporter.GetErrorString()));
}
}The bug is actually within the assimp library and only happens for fbx format at CreationTimeStamp.Dump(outstream, binary, indent);
I tried the code above to export a triangle for obj format and the output is
Zi1mann
Describe the bug Calling Exporter object to export AIScene to file crashes Unreal Engine
To Reproduce Exposing the function below to Blueprints and calling the function at runtime results in an access violation.