#include <Graphic3d_Structure.hxx>
#include <Standard_Boolean.hxx>
-#include <Quantity_Length.hxx>
+
class Prs3d_Root;
class Graphic3d_StructureManager;
class Graphic3d_Structure;
class Geom_Transformation;
class Graphic3d_Group;
-
class Prs3d_Presentation;
DEFINE_STANDARD_HANDLE(Prs3d_Presentation, Graphic3d_Structure)