Update doc for Material

doc/salome/gui/GEOM/input/material.doc

@@ -9,40 +9,41 @@
 
 in the following dialog box.
 
-\image html material_front.png
-<center><em><b>Set Material Properties</b> dialog: <b>Front material</b> tab</em></center>
+<center><em><b>Set Material Properties</b> dialog: 
+\image html material.png
 
-\image html material_back.png
-<center><em><b>Set Material Properties</b> dialog: <b>Back material</b> tab</em></center>
+\n With help of <b>Set Material Properties</b> dialog it is possible to set 
+materials of the selected shape(s). 
 
-This functionality is available in both OCC and VTK viewers.
+This functionality is available in OCC and VTK viewers.
 
 User can changed the following material properties
 
 - ambient color and coefficient
 - diffuse color and coefficient
 - specular color and coefficient
-- emission color and coefficient (available only in OCC viewer)
+- emission color and coefficient (available only in OCC viewer), which simulate light originating from an object.
 - shininess
+- type of material: <b>Physical</b> these materials will not allow modification of color attributes (gold, aluminium, bronze, etc.)
+                    <b>Artificial</b> these materials will allow modification of color attributes (plastic, satin, metall, etc.)
 
-With help of <b>Front material</b> and <b>Back material</b> tabs of
-<b>Set Material Properties</b> dialog it is possible to set front and
-back materials of the selected shape(s). To make <b>Back material</b>
-tab visible it is needed to check <b>Enable back material</b> check
-box. If back material is not defined, front material specified for the
-selected shape(s) is used as both front and back materials.
-
-All currently available materials are shown in the left-side list box
+\n All currently available materials are shown in the left-side list box
 of the <b>Set Material Properties</b> dialog.
 
-- <b>[Current]</b> item in the list corresponds to
-  the front/back (depending on what tab is currently active) material
+- <b>[Current]</b> item in the list corresponds to the material
   currently used for the selected shape(s)
 - <b>[Default]</b> item in the list corresponds to the front/back material
   specified in Geometry module preferences
 - <b>Global</b> materials are shown in blue color in the list
 - <b>User</b> materials are shown in black color in the list 
 
+\n If user tries to change global material, in in the left-side list box
+creates a new user material basing on selected one.
+User materials allow changes without creating a new one.
+Hot keys for the User materials:
+- "Delete" key delete the selected material from list box
+- "F2" key allow to rename selected material
+
 
 <b>Examples:</b>