BBTK_OUTPUT(TransferFunctionView,OpacityFunction,"Transfer function for the opacity", vtkPiecewiseFunction*,"");
BBTK_OUTPUT(TransferFunctionView,ColorFunction,"Transfer function for the color", vtkColorTransferFunction*,"");
BBTK_OUTPUT(TransferFunctionView,WindowLevel,"WidowLevel for the current window", double,"");
BBTK_OUTPUT(TransferFunctionView,ColorLevel,"ColorLevel for the current window", double,"");
BBTK_OUTPUT(TransferFunctionView,OpacityFunction,"Transfer function for the opacity", vtkPiecewiseFunction*,"");
BBTK_OUTPUT(TransferFunctionView,ColorFunction,"Transfer function for the color", vtkColorTransferFunction*,"");
BBTK_OUTPUT(TransferFunctionView,WindowLevel,"WidowLevel for the current window", double,"");
BBTK_OUTPUT(TransferFunctionView,ColorLevel,"ColorLevel for the current window", double,"");