@Max

Do you say that I must select something before run the plugins?

Edit ok that was that! :) Excellent!

So you must put an alert message "Select something before run this plugin"! ;)

About the spray: Why lines are not perpendicular to the surfaces ?
If i take a cube only top & bottom surface have the lines on the good direction :)
And if I select a lateral face and the vertical lines result vOrient don't work!