-BBTK_NAME("SphereList");
-BBTK_AUTHOR("InfoTeam CREATIS");
-BBTK_DESCRIPTION("Builds a sphere list actor given four vectors (X, Y, Z, radius).");
-BBTK_CATEGORY("");
-BBTK_INPUT(SphereList,Renderer,"Renderer",vtkRenderer*,"");
-BBTK_INPUT(SphereList,lstPointX,"List of X coordinates. Requirement: same size as vector Y and vector Z.",std::vector<double>,"");
-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 (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_NAME("SphereList");
+ BBTK_AUTHOR("InfoTeam CREATIS");
+ BBTK_DESCRIPTION("Builds a sphere list actor given four vectors (X, Y, Z, radius).");
+ BBTK_CATEGORY("");
+ BBTK_INPUT(SphereList,Renderer,"Renderer",vtkRenderer*,"");
+ BBTK_INPUT(SphereList,lstPointX,"List of X coordinates. Requirement: same size as vector Y and vector Z.",std::vector<double>,"");
+ 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 (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,Spacing,"(default [1 1 1]) Spacing vector [sx sy sz]",std::vector<double>,"");