I'm trying to read data from scene.bin files using Microsoft::glTF SDK. TinyGLTF is not an option. When I try to read MeshPrimitive attribute called TEXCOORD_0 i get a situation where BufferView byteOffset is greater than byteLength. Therefore, I don't know how to properly read given data and my program crashes.
I tried reading data using IStreamReader which is a part of SDK, and is a must when reading bin files using this SDK. I calculate data offset by adding accessor.byteOffset + bufferView.byteOffset which is > byteLength.
struct BuffersAccessors {
Microsoft::glTF::Accessor accessor;
Microsoft::glTF::BufferView view;
Microsoft::glTF::Buffer buffer;
void operator=(BuffersAccessors accessors);
};
template struct BufferInfo {
BuffersAccessors buffersAccessors;
std::vector bufferData;
BufferInfo();
BufferInfo(BuffersAccessors buffersAccessors, std::vector bufferData);
const void operator=(const BufferInfo &info) {
buffersAccessors = info.buffersAccessors;
bufferData = info.bufferData;
};
};
template
std::vector readBufferData(Microsoft::glTF::Document document, BufferInfo bufferInfo, std::filesystem::path path) {
std::vector stream;
if (bufferInfo.buffersAccessors.buffer.uri.length() > 0 || bufferInfo.buffersAccessors.buffer.byteLength > 0) {
Microsoft::glTF::Buffer buffer = bufferInfo.buffersAccessors.buffer;
path += bufferInfo.buffersAccessors.buffer.uri;
path = std::filesystem::absolute(path);
buffer.uri = path.string();
std::shared_ptr streamReader = std::make_shared(path);
Microsoft::glTF::GLTFResourceReader reader(streamReader);
stream = reader.ReadBinaryData(buffer, bufferInfo.buffersAccessors.view);
}
return stream;
}
template
BufferInfo getFullBufferData(Microsoft::glTF::Document document, std::string accessorKey, std::filesystem::path path) {
BufferInfo bufferInfo{};
BuffersAccessors mainPart = getBufferAccessorFromDocument(document, accessorKey);
bufferInfo.buffersAccessors = mainPart;
std::vector bufferData = vkglTF::readBufferData(document, bufferInfo, path);
const size_t bufferDataOffset = mainPart.accessor.byteOffset + mainPart.view.byteOffset; //How to properly calculate offset?
bufferData.erase(bufferData.begin(), bufferData.begin() + bufferDataOffset);
bufferInfo.bufferData = bufferData;
return bufferInfo;
}
I expect data in formats like uint8 and uint16 but my program crashes when trying to do bufferData.erase(..).
Edit: This happens while reading WEIGHTS_0 too.
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