Method InternReadFile

code/AssetLib/FBX/FBXImporter.cpp:126–189

------------------------------------------------------------------------------------------------ Imports the given file into the given scene structure.

// ------------------------------------------------------------------------------------------------
// Imports the given file into the given scene structure.
void FBXImporter::InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler) {
	auto streamCloser = [&](IOStream *pStream) {
		pIOHandler->Close(pStream);
	};
	std::unique_ptr<IOStream, decltype(streamCloser)> stream(pIOHandler->Open(pFile, "rb"), streamCloser);
	if (!stream) {
		ThrowException("Could not open file for reading");
	}

    ASSIMP_LOG_DEBUG("Reading FBX file");

	// read entire file into memory - no streaming for this, fbx
	// files can grow large, but the assimp output data structure
	// then becomes very large, too. Assimp doesn't support
	// streaming for its output data structures so the net win with
	// streaming input data would be very low.
	std::vector<char> contents;
	contents.resize(stream->FileSize() + 1);
	stream->Read(&*contents.begin(), 1, contents.size() - 1);
	contents[contents.size() - 1] = 0;
	const char *const begin = &*contents.begin();

	// broad-phase tokenized pass in which we identify the core
	// syntax elements of FBX (brackets, commas, key:value mappings)
	TokenList tokens;
    Assimp::StackAllocator tempAllocator;
    try {
		bool is_binary = false;
		if (!strncmp(begin, "Kaydara FBX Binary", 18)) {
			is_binary = true;
            TokenizeBinary(tokens, begin, contents.size(), tempAllocator);
		} else {
            Tokenize(tokens, begin, tempAllocator);
		}

		// use this information to construct a very rudimentary
		// parse-tree representing the FBX scope structure
        Parser parser(tokens, tempAllocator, is_binary);

		// take the raw parse-tree and convert it to a FBX DOM
		Document doc(parser, mSettings);

		// convert the FBX DOM to aiScene
		ConvertToAssimpScene(pScene, doc, mSettings.removeEmptyBones);

		// size relative to cm
		float size_relative_to_cm = doc.GlobalSettings().UnitScaleFactor();
        if (size_relative_to_cm == 0.0) {
			// BaseImporter later asserts that fileScale is non-zero.
			ThrowException("The UnitScaleFactor must be non-zero");
        }

		// Set FBX file scale is relative to CM must be converted to M for
		// assimp universal format (M)
		SetFileScale(size_relative_to_cm * 0.01f);

		// This collection does not own the memory for the tokens, but we need to call their d'tor
        std::for_each(tokens.begin(), tokens.end(), Util::destructor_fun<Token>());