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= Analysis =

== Overview ==

The user can change the opacity of the whole frame. 

== Task requirements ==

 * The frame opacity should be kept in the model. 

 * The default frame opacity is 1. 

 * The frame opacity could be changed by the opacity slider bar in the frame appearance hud.  
 
 * The whole frame should be drawn according to the common level of transparency determined by the opacity. 

== Task result ==
The result of this task is source code.  

== Implementation idea ==

Add a slider bar to the frame appearance hud which values could change from 0 to 1 and a label showing what is the chosen opacity. 
When creating the scene elements in the frame view multiply all elements color opacity with the frame common opacity. 

== Related ==
 [wiki:FRAME_APPEARANE_HALO_AND_HUD_R0] [[BR]]

== How to demo ==

 * Demonstrate how a frame becomes lighter when the opacity is closer to 0.  

= Design =


= Implementation =
^(Implementation results should be described and linked here (from the wiki or the repository))^

= Testing =

= Comments =
^(Write comments for this or later revisions here.)