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Is it possible to do maths in unity interface, after hitting the Alt key ?

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In HUD , you can't , it is Global MENU of your Active Application. – atenz Jul 14 '12 at 8:53
up vote 7 down vote accepted

I don't know if you can do it in the HUD (Alt-button), but you can do it in the Dash (super-button) with a scope.

Use these commands to install the Calculator Scope for Unity via terminal:

sudo add-apt-repository ppa:scopes-packagers/ppa
sudo apt-get update
sudo apt-get install unity-scope-calculator

Here the OMGUbuntu article on unity-scope-calculator.

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