I can't even deselect vertices with rectangular selection tool. Dunno if it is originally like that
Yes, that is standard behavior. AFAIK there is no modifier key (shift, alt, whatever) that will make it subtract from, instead of adding to, the selection. What does work, however, is to invert the selection (so that all vertices that were not selected are now selected, and vice versa), select the vertices you want to deselect, and invert the selection again.
You have to go to File->User Preferences. Then Click the AddOns Tab, and in the search box in the top left corner type 'rig'. Then you should see 'Import-Export: Sims 3 RIG Editor. Click the check box next to it to enable the rig editor.
hi, i'm search the box but it i didn't see Import-Export: Sims 3 RIG Editor, what's the problem?
i did install io_TS3_geom.zip
sorry i'm just a beginner.