Fixing normals without getting in edit mode I'm modeling a complex object,i did the high and low poly versions of this object and now i'm going to bake the normal maps ,but i've got a problem. I Split this object in a couple pieces,then i joined them together. I did for the lowpoly version, some normals got inverted, so i went to Edit mode>Control+N and it got fixed. The high poly version got those inverted normals aswell when i joined the pieces, however when i try to Edit mode>Control+N it crashes the whole PC because it has to many quads. I have a quite good PC for modelling (Core I5 3470/ GTX 760 / 12GB RAM)

I was wondering if there any way to fix the normals without getting into edit mode. Can you guys please help me? Thank you in advance
As far as I think that @bertmoog could be right I will try to answer your question and propose Add-on called Flippist from Alexey Khlystov.




Download Add-on from link above and install/enable it as usual.
Select one (or multiple) object.
Hit Spacebar, then type Flippist.
You can change settings by pressing F6 or in Tool Shelf.