occt/dox/user_guides/inspector/inspector.md

Inspector

@tableofcontents

@section occt_inspector_1 Introduction

This manual explains how to use the Inspector.

@subsection occt_inspector_1_1 Overview Inspector is a Qt-based library that provides functionality to interactively inspect low-level content of the OCAF data model, OCCT viewer and Modeling Data. This component is aimed to assist the developers of OCCT-based applications to debug the problematic situations that occur in their applications.

Inspector has a plugin-oriented architecture. The current release contains the following plugins:

Plugin	OCCT component	Root class of OCCT investigated component
@ref occt_inspector_2_2 "DFBrowser"	OCAF	TDocStd_Application
@ref occt_inspector_2_3 "VInspector"	Visualization	AIS_InteractiveContext
@ref occt_inspector_2_4 "ShapeView"	Modeling Data	TopoDS_Shape
@ref occt_inspector_2_5 "MessageView"	Modeling Data	Message_Report

Each plugin implements logic of a corresponding OCCT component.

Each of the listed plugins is embedded in the common framework, thus it is possible to manage, which plugins should be loaded by the Inspector, and to extend their number by implementing a new plugin.

@subsection occt_inspector_1_3 Getting started

There are two launch modes:

1. Launch TInspectorEXE executable sample. For more details see @ref occt_inspector_4_1 "TInspectorEXE" section;
2. Launch DRAW, load plugin INSPECTOR, and use tinspector command. For more details, see @ref occt_inspector_4_2 "Launch in DRAW Test Harness" section.

Note. If you have no Inspector library in your build directory, make sure that OCCT is compiled with BUILD_Inspector option ON. For more details see @ref occt_inspector_5 "Build procedure".

@section occt_inspector_2 Inspector Plugins

@subsection occt_inspector_2_1 Overview

Inspector consists of the following components:

• buttons to activate the corresponding plugin;
• view area to visualize the plugin content.

@figure{tinspector_elements.svg,"Plugins placement in Inspector",360}

@subsection occt_inspector_2_2 DFBrowser Plugin

@subsubsection occt_inspector_2_2_1 Overview

@figure{dfbrowser.png, "DFBrowser"}

This plugin visualizes the content of TDocStd_Application in a tree view. It shows application documents, the hierarchy of TDF_Labels, the content of TDF_Attributes and interconnection between attributes (e.g. references). Additionally there is a 3D view to visualize TopoDS_Shape elements stored in the document.

@subsubsection occt_inspector_2_2_2 Elements

@figure{dfbrowser_elements.svg, "DFBrowser Elements",360}

OCAF tree view

Each OCAF element has own tree view item:

Type	Tree item	Text	Description
TDocStd_Application	Application	TDocStd_Application	The root of tree view. Its children are documents.
TDocStd_Document	Document	entry : name	A child of Application item. Its children are Label and Attribute items. Text view is an entry of the root label and the value of TDataStd_Name attribute for the label if it exists.
TDF_Label	Label	entry : name	A child of a Document or another Label item. Its children and text view are the same as for Document item.
TDF_Attribute	Attribute	attribute type [additional information]	A child of a Label. It has no children. Text view is the attribute type (DynamicType()->Name() of TDF_Attribute) and additional information (a combination of attribute values).

Additional information about TDF_Attributes:

Type	Text
TDocStd_Owner	[storage format]
TDataStd_AsciiString, TDataStd_Name, TDataStd_Real, other Simple type attributes	[value]
TDataStd_BooleanList, TDataStd_ExtStringList, other List attributes	[value_1 ... value_n]
TDataStd_BooleanArray, TDataStd_ByteArray, other Array type attributes	[value_1 ... value_n]
TDataStd_TreeNode	[tree node ID ==> Father()->Label()] (if it has a father) or [tree node ID <== First()->Label()] (if it has NO father)
TDataStd_TreeNode(XDE)	[XDE tree node ID ==> Father()->Label()] (if it has a father), [XDE tree Node ID <== label_1, ..., label_n] (if it has NO father)
TNaming_NamedShape	[shape type : evolution]
TNaming_UsedShapes	[map extent]

Custom color of items:

OCAF element Type	Color
TDF_Label	dark green, if the label has TDataStd_Name attribute, light grey if the label is empty (has no attributes on all levels of hierarchy), black otherwise.
TNaming_NamedShape	dark gray for TopAbs_FORWARD orientation of TopoDS_Shape, gray for TopAbs_REVERSED orientation of TopoDS_Shape, black for other orientation.

Context pop-up menu:

Action	Functionality
Expand	Expands the next two levels under the selected item.
Expand All	Expands the whole tree of the selected item.
Collapse All	Collapses the whole tree of the selected item.

Property Panel

Property panel is used to display the result of TDF_Attribute::Dump() or TDF_Label::Dump() of the selected tree view item. The information is shown in one table.

@figure{property_panel.png,"PropertyPanel",360}

Property Panel (custom)

Property panel (custom) is used to display the content of Label or Attribute tree view items or Search result view. The information is usually shown in one or several tables.

TDF_Attribute has the following content in the Property Panel:

Type	Description	Content
TDF_Label	a table of [entry or attribute name, value]	@figure{property_panel_custom_label.png, "",140}
TDocStd_Owner, Simple type attributes, List type attributes	a table of [method name, value]	@figure{property_panel_custom_simple_type.png, "",140}
TDataStd_BooleanArray, TDataStd_ByteArray, other Array type attributes	2 controls: - a table of [array bound, value], - a table of [method name, value]	@figure{property_panel_custom_array.png, "",140}
TDataStd_TreeNode	2 controls: - a table of [Tree ID, value] (visible only if Tree ID() != ID() ), - a tree view of tree nodes starting from *Root()* of the tree node. The current tree node has dark blue text.	@figure{property_panel_custom_tree_node.png, "",140}
TDataStd_NamedData	tab bar of attribute elements, each tab has a table of [name, value]	@figure{property_panel_custom_named_data.png, "",140}
TNaming_UsedShapes	a table of all shapes handled by the framework	@figure{property_panel_custom_tnaming_used_shapes.png, "",140}
TNaming_NamedShape	2 controls: - a table of [method name, value] including CurrentShape/OriginalShape methods result of TNaming_Tools, - an evolution table. Tables contain buttons for @ref occt_shape_export "TopoDS_Shape export".	@figure{property_panel_custom_tnaming_named_shape.png, "",140}
TNaming_Naming	2 controls: - a table of TNaming_Name values, - a table of [method name, value]	@figure{property_panel_custom_tnaming_naming.png, "",140}

Dump view

@figure{dump_attribute.png, "Dump of TDF_Attribute",200}

Dump view shows the result of TDF_Attribute::Dump() or TDF_Label::Dump() of the selected tree view item.

3D view

3D View visualizes TopoDS_Shape elements of OCAF attribute via AIS facilities.

DFBrowser creates two kinds of presentations depending on the selection place:

Kind	Source object	Visualization properties	View
Main presentation	Tree view item: *TPrsStd_AISPresentation*, *TNaming_NamedShape*, *TNaming_Naming*	Color: a default color for shape type of the current *TopoDS_Shape*.	@figure{display_main_presentation.png, "",100}
Additional presentation	References in Property panel	Color: white	@figure{display_additional_presentation.png, "",100}

Tree Navigation

Tree Navigation shows a path to the item selected in the tree view. The path is a sequence of label entries and attribute type names. Each element in the path is selectable - simply click on it to select the corresponding tree view item.

Navigation control has buttons to go to the previous and the next selected tree view items.

Update Button

Update button synchronizes content of tree view to the current content of OCAF document that could be modified outside.

Search

The user can search OCAF element by typing:

• TDF_Label entry,
• TDF_Attribute name,
• TDataStd_Name and TDataStd_Comment attributes value.

@figure{search.png,"Search",360}

As soon as the user confirms the typed criteria, the Property panel is filled by all satisfied values. The user can click a value to highlight the corresponding tree view item. By double click the item will be selected.

@subsubsection occt_inspector_2_2_3 Elements cooperation

Tree item selection

Selection of tree view item updates content of the following controls:

• Navigation line;
• Property Panel;
• 3D View (if it is possible to create an interactive presentation);
• Dump View.

@figure{dfbrowser_selection_in_tree_view.svg,"",360}

Property Panel (custom) item selection

If the property panel (custom) shows content of TDF_Label:

• selection of the table row highlights the corresponding item in the tree view,
• double click on the table row selects this item in the tree view.

If the property panel (custom) shows content of TDF_Attribute that has reference to another attribute, selection of this reference:

• highlights the referenced item in the tree view,
• displays additional presentation in the 3D view if it can be created.

@figure{property_panel_custom_item_selection.svg,"",360}

Attributes having references:

Type	Reference	Additional presentation
TDF_Reference	TDF_Label
TDataStd_ReferenceArray, TDataStd_ReferenceList, TNaming_Naming	One or several TDF_Label in a container.
TDataStd_TreeNode	TDF_Label
TNaming_NamedShape	TDF_Label in Evolution table	TopoDS_Shapes selected in the property panel tables.
TNaming_UsedShapes	one or several TNaming_NamedShape	TopoDS_Shapes of the selected TNaming_NamedShape.

@subsubsection occt_shape_export TopoDS_Shape export

Property panel of TNaming_NamedShape attribute has controls to export TopoDS_Shape to:

• BREP. Save file dialog is open to enter the result file name,
• @ref occt_inspector_2_4 "ShapeView" plugin. The dialog for exporting element to ShapeView allows activating this plugin immediately.

@subsection occt_inspector_2_3 VInspector Plugin

@subsubsection occt_inspector_2_3_1 Overview

@figure{vinspector.png, "VInspector",360}

This plugin visualizes interactive objects displayed in AIS_InteractiveContext in a tree view with computed selection components for each presentation. It shows the selected elements in the context and allows selecting these elements.

@subsubsection occt_inspector_2_3_2 Elements

@figure{vinspector_elements.svg,"VInspector Elements",360}

Presentations tree view

This view shows presentations and selection computed on them. Also, the view has columns with information about the state of visualization elements.

VInspector tree items.

Type	Description
AIS_InteractiveContext	The root of tree view. Its children are interactive objects obtained by DisplayedObjects and ErasedObjects methods.
AIS_InteractiveObject	A child of AIS_InteractiveContext item. Its children are SelectMgr_Selection obtained by iteration on CurrentSelection.
SelectMgr_Selection	A child of AIS_InteractiveObject. Its children are SelectMgr_SensitiveEntity obtaining by iteration on Sensitive.
SelectMgr_SensitiveEntity	A child of SelectMgr_Selection. Its children are SelectMgr_SensitiveEntity obtaining by iteration on OwnerId.
SelectBasics_EntityOwner	A child of SelectMgr_SensitiveEntity. It has no children.

Custom color of tree view items:

OCAF element Type	Column	What	Color
AIS_InteractiveObject	0	Text	dark gray in ErasedObjects list of AIS_InteractiveContext, black otherwise
AIS_InteractiveObject, SelectMgr_SensitiveEntity, SelectBasics_EntityOwner	1	Background	dark blue, if there is a selected owner under the item, black otherwise
SelectMgr_Selection, SelectMgr_SensitiveEntity, electBasics_EntityOwner	all	Text	dark gray, if SelectionState of SelectMgr_Selection is not SelectMgr_SOS_Activated, black otherwise

Context popup menu in tree view:

Action	Item	Functionality
Export to ShapeView	AIS_InteractiveObject	Exports TopoDS_Shape of the AIS_Interactive presentation to ShapeView plugin. It should be AIS_Shape presentation and ShapeView plugin should be registered in Inspector Dialog about exporting element to ShapeView is shown with a possibility to activate this plugin immediately.
Show	AIS_InteractiveObject	Displays presentation in AIS_InteractiveContext.
Hide	AIS_InteractiveObject	Erases presentation from AIS_InteractiveContext.

Update

This button synchronizes the plugin content with the current state of AIS_InteractiveContext and updates the presence of items and their current selection.

@subsubsection occt_inspector_2_3_3 Elements cooperation

VInspector marks the presentations currently selected in AIS_InteractiveContext with a blue background in tree items. Use Update button to synchronize VInspector selected items state to the context.

It is also possible to perform selection in the context using "Selection controls" VInspector feature. However, this operation should be performed carefully as it clears the current selection in AIS_InteractiveContext.

Selection change:

From	To	Action	Result
AIS_InteractiveContext	VInspector	Performs selection in AIS_InteractiveContext.	Click Update button in VInspector and check Selection column: AIS_InteractiveContext item contains some selected objects, the value of some AIS_InteractiveObject is filled if they are selected for this presentation or its entity owner.
VInspector	AIS_InteractiveContext	Activates one of Selection controls and selects one or several elements in the tree view.	The objects become selected in AIS_InteractiveContext.

@subsubsection occt_inspector_2_3_4 VInspector tree view columns

Use context pop-up menu on the tree view header to select, which columns should be displayed. @figure{vinspector_tree_columns.png, "Vinspector tree header context menu",360}

Use the setting Lights (position, color) in the view. @figure{vinspector_light_setting.png, "Vinspector light setting",360}

@subsubsection occt_inspector_2_3_5 VInspector property panel

Property panel shows the result of AIS_InteractiveContext::Dump() or AIS_InteractiveObject::Dump(). @figure{vinspector_property_panel.png, "Vinspector property panel",360}

@subsection occt_inspector_2_4 ShapeView Plugin

@subsubsection occt_inspector_2_4_1 Overview

@figure{shapeview.png, "ShapeView",360}

This plugin visualizes content of TopoDS_Shape in a tree view.

@subsubsection occt_inspector_2_4_2 Property panel

Property panel shows properties for TopoDS_Shape based on DumpJson.

@figure{shapeview_property_panel.png, "ShapeView Property panel",360}

@subsubsection occt_inspector_2_4_3 Elements

@figure{shapeview_elements.svg,"ShapeView Elements",360}

TopoDS_Shape View

The view elements are TopoDS_Shape objects. The shape is exploded into sub-shapes using TopoDS_Iterator of the TopoDS_Shape. Children sub-shapes are presented in the view as children of the initial shape. By iterating recursively through all shapes we obtain a tree view of items shown in the ShapeView.

The columns of the View show some information about TopoDS_Shape of the item. The first column allows changing the visibility of the item shape in the 3D view.

Context pop-up menu in tree view:

Action	Functionality
Load BREP file	Opens the selected file and appends the resulting TopoDS_Shape into the tree view.
Remove all shape items	Clears tree view.
BREP view	Shows the text view with BREP content of the selected item. Creates the BREP file in a temporary directory of the plugin.
Close All BREP views	Closes all opened text views.
BREP directory	Displays the folder, where temporary BREP files have been stored.

@subsubsection occt_inspector_2_4_4 Elements cooperation

Selection of one or several items in TopoDS_Shape View creates its AIS_Shape presentation and displays it in the 3D View.

@subsubsection occt_inspector_2_4_5 ShapeView tree view columns

Use context pop-up menu on the tree view header to select, which columns should be displayed. @figure{shapeview_tree_columns.png, "ShapeView tree header context menu",360}

@subsection occt_inspector_2_5 MessageView Plugin

MessageView plugin is used to display content of Message_Report.

@subsubsection occt_inspector_2_5_1 Message report tree view

Message report tree view shows the content of the Message_Report.

Context pop-up menu in message report tree view:

Action	Functionality
Export Report	Exports the report as json file.
WallClock Metric statistic	Creates the table that sums the number of calls and the time spent on the functionality inside the value and shows it in Property panel (custom). It's necessary to activate "WallClock metric".
Preview children presentations	Displays presentations of children items of selected items if found.
Deactivate	Deactivates all types of metrics for the current report.
Activate	Appends items to activate report metrics.
Clear	Clears message report.
Activate metric	Switches active state in report for clicked type of metric.
Test metric	Sends several alerts to check metric of message-alert-tool mechanism.
Test Message_Messenger	Sends several alerts to check property panel/presentations of messenger-alert-tool mechanism.
Test Tree of messages	Sends several alerts to check tree of alerts.

@figure{messageview_pop_up_menu.png, "MessageView pop-up menu",360}

@subsubsection occt_inspector_2_5_2 3D View

3D View shows the selected item (TopoDS_Shape) in message report tree view. @figure{messageview_view.png, "MessageView 3D View",360}

@subsubsection occt_inspector_2_5_3 Dump panel

Shows Dump() information of the selected item if the item has Dump(). @figure{messageview_dump_panel.png, "MessageView 3D View",360}

@subsubsection occt_inspector_2_5_4 Property panel (custom)

Shows the table for WallClock Metric statistic option. @figure{messageview_property_panel_custom.png, "MessageView 3D View",360}

@subsubsection occt_inspector_2_5_5 Elements @figure{messageview_elements.svg, "MessageView elements",360}

@section occt_inspector_3 Common controls

@subsection occt_inspector_3_1 Tree View

This control shows presentation hierarchy of the investigated OCCT element, e.g. TDocStd_Application for DFBrowser, see @ref occt_inspector_1_1 "Overview". The first column contains the name, other columns are informative.

The tree view has a context menu with plugin-specific actions.

@subsubsection occt_inspector_3_1_1 Tree View preferences

It is possible to define visibility and width of columns. This option is available in a view that contains more than one column, e.g. @ref occt_inspector_2_3_4 "VInspector tree view columns" and @ref occt_inspector_2_4_4 "ShapeView tree view columns".

@figure{treeview_preferences.svg, "Preferences schema",360}

@subsection occt_inspector_3_2 3D View

@subsubsection occt_inspector_3_2_1 Overview

@figure{3DView.png, "3D View",360}

This control for OCCT 3D viewer creates visualization view components and allows performing some user actions in the view.

@subsubsection occt_inspector_3_2_2 Elements

@figure{3DView_elements.svg,"3DView Elements",360}

3D View contains the following elements:

Element	Functionality
3D view	V3d viewer with mouse events processing.
Context	Allows choosing another context that should be used in the plugin. The following contexts are available: Own - the context of this view, External - the context of the @ref occt_inspector_4_3 "external application", which initializes the plugin, None - the visualization is not performed at all (useful if the presentation is too complex).
Multi/Single	The buttons define what to do with the previously displayed objects: Multi displays new presentations together with already displayed ones, Single removes all previously displayed presentations.
Clean	Removes all displayed presentations.
Trihedron display	Shows the trihedron.
View cube display	Shows the view cube.
Fit All	Scene manipulation actions (Fit All is checkable. If checked(by double click), display/hide of new objects will perform Fit All of the scene.)
Display Mode	Sets AIS_Shading or AIS_WireFrame display mode for all presentations.

Context popup menu:

Action	Functionality
Set View Orientation	Shows the list of available V3d_View projections. Selection of an item with change the view.

@figure{3DView_set_orientation.png,"Set view orientation",360}

@subsubsection occt_inspector_3_2_3 3D View preferences. View preferences store the current view orientation.

@subsection occt_inspector_3_3 Preferences context menu

@figure{preferences.png,"Plugin preferences",360}

Context menu contains:

Element	Functionality
Tree Level Line, PropertyPanel, PropertyPanel (custom), Dump, View	Names of dock widgets in the active plugin. If the button is checked, dock widget is visible.
Store Preferences	Creates ".tinspector.xml" preferences file with the current settings for each plugin. This file is created in TEMP/TMP directory (by default) or in a user-defined directory.
Remove Preferences	Removes preferences file. After the Inspector is restarted, default values will be applied.

The following controls have store/restore preferences:

Element	Preferences
Geometry	Inspector window size and position. State of dockable widgets : visibility, position, size.
@ref occt_inspector_3_1_1 "Tree View preferences"	Columns visible in the tree view and their width.
@ref occt_inspector_3_2_3 "3D View preferences"	3D view camera direction.

@section occt_inspector_4 Getting Started

@subsection occt_inspector_4_1 TInspectorEXE sample

This sample allows trying Inspector functionality.

Use inspector.bat script file placed in a binary directory of OCCT to launch it.

This script accepts the names of plugin's DLL that should be loaded. By default it loads all plugins described above.

@figure{TStandaloneEXE.png, "TStandaloneEXE",360}

Click on the Open button shows the dialog to select a file. @figure{TStandaloneEXE_open.png, "",360}

Depending on the active plugin, it is possible to select the following files in the dialog:

• DFBRowser: OCAF document or STEP files;
• VInspector: BREP files;
• ShapeView: BREP files.

Click the file name in the proposed directory and enter it manually or using Browse button.

By default, TInspectorEXE opens the following files for plugins:

Plugin DLL library name	Files
TKDFBrowser	step/screw.step
TKVInspector	occ/hammer.brep
TKShapeView	occ/face1.brep, occ/face2.brep

These files are found relatively to CSF_OCCTDataPath.

@subsubsection occt_inspector_4_1_1 TInspectorEXE preferences The application stores recently loaded files. On the application start, the last file is activated. Open file dialog contains recently loaded files. Selection of a new file updates the container of recently loaded files and rewrites preferences.

Source code of TIspectorEXE is a good sample for @ref occt_inspector_4_3 "using the Inspector in a custom application".

@subsection occt_inspector_4_2 How to launch the Inspector in DRAW Test Harness

TKToolsDraw plugin provides DRAW commands for Qt tools. Use INSPECTOR parameter of @ref occt_draw_1_3_3 "pload" command to download the commands of this library. It contains tinspector command to start Inspector under DRAW. See more detailed description of the @ref occt_draw_13_1 "tinspector" command.

The simple code to start Inspector with all plugins loaded:

pload INSPECTOR
tinspector

@figure{drawexe_tinspector.png,"tinspector",360}

This command does the following:

• all available Plugins are presented in the Inspector. These are @ref occt_inspector_2_2 "DFBrowser", @ref occt_inspector_2_3 "VInspector", @ref occt_inspector_2_4 "ShapeView" and @ref occt_inspector_2_5 "MessageView";
• DFBrowser is the active plugin;
• OCAF tree is empty.

After this, we should create objects in DRAW and update tinspector. The examples of using Inspector in DRAW can be found in OCCT source directory /tests/tools.

@subsection occt_inspector_4_3 How to use the Inspector in a custom application

The example of using the Inspector in a custom application is presented in OCCT qt sample - FuncDemo. For building qt samples, switch on BUILD_SAMPLES_QT variable in @ref build_cmake_conf "Configuration process".

In general, the following steps should be taken:

• Set dependencies to OCCT and Qt in the application (Header and Link);
• Create an instance of TInspector_Communicator;
• Register the plugins of interest in the communicator by DLL library name;
• Initialize the communicator with objects that will be investigated;
• Set visible true for the communicator.

Here is an example of C++ implementation:

#include <inspector/TInspector_Communicator.hxx>

static TInspector_Communicator* MyTCommunicator;

void CreateInspector()
{
  NCollection_List<Handle(Standard_Transient)> aParameters;
  //... append parameters in the list

  if (!MyTCommunicator)
  {
    MyTCommunicator = new TInspector_Communicator();

    MyTCommunicator->RegisterPlugin ("TKDFBrowser");
    MyTCommunicator->RegisterPlugin ("TKVInspector");
    MyTCommunicator->RegisterPlugin ("TKShapeView");
    MyTCommunicator->RegisterPlugin ("TKMessageView");

    MyTCommunicator->Init (aParameters);
    MyTCommunicator->Activate ("TKDFBrowser");
  }
  MyTCommunicator->SetVisible (true);
}

Give one the following objects for a plugin using a container of parameters:

Plugin	to be initialized by
TKDFBrowser	TDocStd_Application
TKVInspector	AIS_InteractiveContext
TKShapeView	TopoDS_TShape
TKMessageView	Message_Report

@section occt_inspector_5 Build procedure

@subsection occt_inspector_5_1 Building with CMake within OCCT

By default the Inspector compilation is off. To compile it, set the BUILD_Inspector flag to "ON". See @ref build_cmake_conf "Configuration process".

When this option is switched ON, MS Visual Studio project has an additional tree of folders:

@figure{VStudio_projects.png,"Inspector packages in MS Visual Studio",160}

@section occt_inspector_6 Sources and packaging

OCCT sources are extended by the /tools directory.

Distribution of plugin packages :

Source packages	Plugin
DFBrowser, DFBrowserPane, DFBrowserPaneXDE, TKDFBrowser	DFBrowser
VInspector, TKVInspector	VInspector
ShapeView, TKShapeView	ShapeView
MessageView, TKMessageView	MessageView

Other packages:

Source packages	Used in
TInspectorAPI, TKInspectorAPI	Interface for connection to plugin.
ViewControl, TKTreeModel	Classes for property view, table, table model.
TreeModel, TKTreeView	Items-oriented model to simplify work with GUI tree control.
View, TKView	3D View component.
TInspector, TKTInspector	Inspector window, where plugins are placed.
ToolsDraw, TKToolsDraw	Plugin for DRAW to start Inspector.

In MSVC studio, a separate folder contains Inspector projects.

@section occt_inspector_7 Glossary

• Component -- a part of OCCT , e.g. OCAF, VISUALIZATION, MODELING and others.
• Plugin -- a library that is loaded in some executable/library. Here, the plugins are:
  • DFBrowser,
  • ShapeView,
  • VInspector.