Function convertLegacyVariables

src/IECoreScene/Primitive.cpp:220–351

}

void convertLegacyVariables( PrimitiveVariableMap &variables )
{
	std::set<Data *> processed;
	std::vector<PrimitiveVariableMap::const_iterator> variablesToErase;

	for( auto it = variables.begin(); it != variables.end(); ++it )
	{
		// We changed from s & t (FloatVectorData) to UVs (V2fVectorData)
		// in version 2, so we collect our UV sets and combine them.

		// We have 2 legacy conventions for storing UVs:
		//  (a) PrimitiveVariables named "s" and "t" represent
		//      the components of the primary UV set.
		//  (b) PrimitiveVariables named "<var>_s" and "<var>_t"
		//      represent the components of an extra UV set
		//      named "<var>".

		// We also changed from storing separate indices
		// as side-car PrimitiveVariables to storing them
		// directly on the primary PrimitiveVariable.

		// We have 3 legacy conventions for storing indices:
		//  (a) For the primary UV set, as in (a) above, the
		//      indices were named "stIndices".
		//  (b) For the extra UV sets, as in (b) above, the
		//      indices were named "<var>Indices".
		//  (c) For non-UV PrimitiveVariables named "<var>"
		//      the indices were also named "<var>Indices".

		// the name of the uvSet if there is one
		std::string uvSet;
		// the u values if we find any
		PrimitiveVariableMap::const_iterator uIt = variables.end();
		// the v values if we find any
		PrimitiveVariableMap::const_iterator vIt = variables.end();
		// the indices if we find any
		PrimitiveVariableMap::const_iterator indicesIt = variables.end();

		if( it->first == "s" )
		{
			uvSet = "uv";
			uIt = it;
			vIt = variables.find( "t" );
			indicesIt = variables.find( "stIndices" );
		}
		else if( it->first == "t" )
		{
			uvSet = "uv";
			uIt = variables.find( "s" );
			vIt = it;
			indicesIt = variables.find( "stIndices" );
		}
		else if( boost::ends_with( it->first, "_s" ) )
		{
			uvSet = it->first.substr( 0, it->first.length() - 2 );

			uIt = it;
			vIt = variables.find( uvSet + "_t" );