four items inherit from Item3D

GUI/Model/Sample/Item3D.h

+//  ************************************************************************************************
+//
+//  BornAgain: simulate and fit reflection and scattering
+//
+//! @file      GUI/Model/Sample/Item3D.h
+//! @brief     Defines class Item3D
+//!
+//! @homepage  http://www.bornagainproject.org
+//! @license   GNU General Public License v3 or higher (see COPYING)
+//! @copyright Forschungszentrum Jülich GmbH 2021
+//! @authors   Scientific Computing Group at MLZ (see CITATION, AUTHORS)
+//
+//  ************************************************************************************************
+
+#ifndef BORNAGAIN_GUI_MODEL_SAMPLE_ITEM3D_H
+#define BORNAGAIN_GUI_MODEL_SAMPLE_ITEM3D_H
+
+//! Base class of items that can be at the root of a realspace 3D representation
+class Item3D {
+};
+
+#endif // BORNAGAIN_GUI_MODEL_SAMPLE_ITEM3D_H

GUI/Model/Sample/ItemWithParticles.h

@@ -19,12 +19,13 @@
 #include "GUI/Model/Descriptor/SelectionProperty.h"
 #include "GUI/Model/Descriptor/VectorProperty.h"
 #include "GUI/Model/Sample/RotationItems.h"
+#include "GUI/Model/Sample/Item3D.h"
 #include <memory>
 
 class IRotation;
 class Streamer;
 
-class ItemWithParticles {
+class ItemWithParticles : public Item3D {
 public:
     virtual ~ItemWithParticles() = default;
     DoubleDescriptor abundance() const;

GUI/Model/Sample/LayerItem.h

@@ -20,6 +20,7 @@
 #include "GUI/Model/Descriptor/UIntProperty.h"
 #include "GUI/Model/Sample/ItemWithMaterial.h"
 #include "GUI/Model/Sample/LayerRoughnessItems.h"
+#include "GUI/Model/Sample/Item3D.h"
 #include <QColor>
 #include <QUuid>
 #include <QVector>
@@ -33,7 +34,7 @@ class QXmlStreamReader;
 class QXmlStreamWriter;
 class Streamer;
 
-class LayerItem : public ItemWithMaterial {
+class LayerItem : public ItemWithMaterial, Item3D {
 public:
     explicit LayerItem(const MaterialItems* materials);
 

GUI/Model/Sample/MultiLayerItem.h

@@ -18,6 +18,7 @@
 #include "GUI/Model/Descriptor/DoubleProperty.h"
 #include "GUI/Model/Descriptor/VectorProperty.h"
 #include "GUI/Model/Sample/MaterialItems.h"
+#include "GUI/Model/Sample/Item3D.h"
 #include <QString>
 #include <QUuid>
 #include <QVector>
@@ -28,7 +29,7 @@ class QXmlStreamReader;
 class QXmlStreamWriter;
 class Streamer;
 
-class MultiLayerItem {
+class MultiLayerItem : public Item3D {
 public:
     MultiLayerItem();
 

GUI/Model/Sample/ParticleLayoutItem.h

@@ -18,6 +18,7 @@
 #include "GUI/Model/Descriptor/DoubleProperty.h"
 #include "GUI/Model/Descriptor/SelectionProperty.h"
 #include "GUI/Model/Sample/InterferenceItems.h"
+#include "GUI/Model/Sample/Item3D.h"
 #include <QUuid>
 #include <memory>
 
@@ -25,7 +26,7 @@ class ItemWithParticles;
 class Streamer;
 class MaterialItems;
 
-class ParticleLayoutItem {
+class ParticleLayoutItem : public Item3D {
 public:
     ParticleLayoutItem(const MaterialItems* materials);