BBTK_CATEGORY("empty");
BBTK_INPUT(ConcatTransform,In1,"vtkLinearTransform input",vtkLinearTransform*,"");
BBTK_INPUT(ConcatTransform,In2,"vtkLinearTransform input",vtkLinearTransform*,"");
BBTK_CATEGORY("empty");
BBTK_INPUT(ConcatTransform,In1,"vtkLinearTransform input",vtkLinearTransform*,"");
BBTK_INPUT(ConcatTransform,In2,"vtkLinearTransform input",vtkLinearTransform*,"");