Function readFrame

Tools/MeshSkinning/main.cpp:570–637

}

bool readFrame(std::vector<Vector3r>& x, const unsigned int frame)
{
	std::string fileName = convertFileName(input, frame);

	x.clear();
	id.clear();

	// check if file exists
	if (!FileSystem::fileExists(fileName))
		return false;

	// read partio file
	Partio::ParticlesDataMutable* data = Partio::read(fileName.c_str());
	if (!data)
		return false;

	// find position and id attribute
	unsigned int posIndex = 0xffffffff;
	unsigned int idIndex = 0xffffffff;
	for (int i = 0; i < data->numAttributes(); i++)
	{
		Partio::ParticleAttribute attr;
		data->attributeInfo(i, attr);
		if (attr.name == "position")
			posIndex = i;
		if (attr.name == "id")
			idIndex = i;
	}

	// read IDs
	Partio::ParticleAttribute attr;
	if (idIndex != 0xffffffff)
	{
		id.resize(data->numParticles());
		data->attributeInfo(idIndex, attr);
		for (int i = 0; i < data->numParticles(); i++)
		{
			const int* id_ = data->data<int>(attr, i);
			id[i] = id_[0];
		}
	}

	// compute the first id since for multiple objects, the ids might not start at 0
	int firstId = INT_MAX;
	for (int i = 0; i < id.size(); i++)
		firstId = std::min(id[i], firstId);


	// read positions
	if (posIndex != 0xffffffff)
	{
		x.resize(data->numParticles());
		data->attributeInfo(posIndex, attr);
		for (int i = 0; i < data->numParticles(); i++)
		{
			const float* pos = data->data<float>(attr, i);

			// use id as index if possible to consider z-sorting in the particle data