\image html occ_view_style_switch.png
-<b>Interaction style switch</b> - allows to switch between "Salome
-standard controls" and "Keyboard free" \ref viewer_navigation_modes "interaction styles".
-
+<b>Interaction style switch</b> - allows to switch between standard
+and "keyboard free" interaction styles. "Keyboard free" style allows
+to process all view transformations without using keyboard (only by
+mouse) and perform selection in view by pressing "S" key. By default,
+rotation in this mode is performed by left mouse button, panning - by
+middle mouse button, zooming - by left and middle mouse buttons
+pressed simultaneously.
<hr>
\image html occ_view_zooming_style_switch.png
<b>Clone view</b> - opens a new duplicate scene.
<hr>
+\anchor clipping_planes
\image html occ_view_clipping.png
<b>Clipping</b> - allows to create cross-section views (clipping
planes) of geometrical objects.
-\image html clipping.png
+To start, click on the \em New button.
+
+Now you must specify what mode of creating plane you want to choose:
+absolute or relative.
+
+<b>Absolute mode</b>
+
+\image html Clipping_Absolute.png
- <b>Base point</b> - allows to define the coordinates of the base
point for the clipping plane.
- <b>Invert</b> - allows to select which part of the object will be
removed and which will remain after clipping.
+
+<b>Relative mode</b>
+
+\image html Clipping_Relative.png
-- <b>Preview</b> - allows to see the results of clipping in the
- viewer.
+- \b Orientation ( ||X-Y, ||X-Z or ||Y-Z).
+- \b Distance between the opposite extremities of the boundary box of
+selected objects, if it is set to 0.5 the boundary box is split in two halves.
+- \b Rotation (in angle degrees) <b>around X</b> (Y to Z) and <b>around
+Y</b> (X to Z) (depending on the chosen Orientation)
+
+
+If the <b>Show preview</b> button is on, you can see the clipping plane
+in the viewer.
+
+If the <b>Auto Apply</b> button is on, you can preview the
+cross-section in the viewer.
<hr>
\image html occ_view_minimized.png
\image html occ_view_maximized.png
-<b>Create sub-views/Maximize</b> - these buttons allow switching the current
+<b>Minimize/Maximize</b> - these buttons allow switching the current
view area to the minimized / maximized state.
-
-<b>Create sub-views</b> - user can select the layout and types of child sub-views:
-
-\image html create_sub-views_dlg.png
-
-- <b>Sub-views Layout</b>
-
- - Three radio-buttons to specify numbers of the views to arrange (2, 3 or 4).
-
- - Buttons (depending on the chosen number of views) with images to specify
- view layout.
-
- - Buttons "Previous" and "Next" for possibility to change split schemas.
-
-- <b>Sub-views Properties</b>
-
- - Type of each sub-view: XZ, YZ, XY or XYZ.
-
-<b>Maximize</b> - the current view area will be converted to maximized state.
-
<hr>
\image html occ_view_sync.png
synchronization of the views is performed, i.e. any zoom, pan, rotate
or other view operation done in one view is automatically applied to
the other view.
+<hr>
+
+\anchor occ_background
+<h2>Background</h2>
+
+OCC Viewer background can be customized using the "Change background"
+popup menu command that opens the following dialog box:
+
+\image html change_background_dlg.png
+
+The following types of the background are supported:
+
+- Single color: the background is colored with the solid color
+ specified by the user in the dialog box.
+
+- Gradient background: the background is gradiently colored according
+ to two colors and the gradient type specified in the dialog box. The
+ following types of background are supported:
+
+ - Horizontal
+
+ - Vertical
+
+ - First diagonal
+
+ - Second diagonal
+
+ - First corner
+
+ - Second corner
+
+ - Third corner
+
+ - Fourth corner
+
+- Image: allows to set image as viewer background and define filling type:
+
+ - Center: the image is located at the center of the viewer backgound
+
+ - Tile: the image fills the entire viewer backgound one by one
+
+ - Stretch: the image is stretched to the entire viewer backgound.
+
+Default background for the viewer is specified via the
+\ref occ_preferences "application preferences".
+
+<h2>Polyline selection</h2>
+
+OCC Viewer features a special <b>Polyline Selection</b> mechanism,
+which allows selecting an arbitraty part of the graphic area using a
+polygon frame (rubber band), instead of the usual selection with a
+rectangular frame.
+
+To produce a Polyline Selection, lock the right mouse button and draw
+the first side of the polygon, then change the direction by clicking
+the left mouse button add draw another side, etc. The whole selection
+frame is drawn with the locked right mouse button.
+
+\image html polyselection1.png
+
+As a result, only the nodes within the frame are selected.
+
+\image html polyselection2.png
*/
