BBTK_INPUT(SphereList,lstPointY,"List of Y coordinates. Requirement: same size as vector X and vector Z.",std::vector<double>,"");
BBTK_INPUT(SphereList,lstPointZ,"List of Z coordinates. Requirement: same size as vector X and vector Y.",std::vector<double>,"");
BBTK_INPUT(SphereList,lstRadio,"List of Radio values",std::vector<double>,"");
-BBTK_INPUT(SphereList,Colour,"Colour RGB values for the spheres",std::vector<double>,"");
+BBTK_INPUT(SphereList,Colour,"Colour RGB values for the spheres (3 first values of the vector for the first sphere, following values for the second sphere, etc.)",std::vector<double>,"");
BBTK_INPUT(SphereList,Opacity,"Opacity of the spheres",double,"");
BBTK_INPUT(SphereList,Transform,"vtkTransform",vtkLinearTransform*,"");