Jinx Niseru

I've been working on a mesh gas mask and i've run into a problem. Obviously it won't fit everyone perfectly. Right now I can get it to sit right on one person, but have clipping issues on another person. Would rigging the mesh help with sizing? If so, how would I go about that in blender?

Hmm yeah, there's a negative number in the z scale. But I can't seem to make it positive without making another axis negative. Any ideas? Edit: Nevermind simply making that one scale positive did the trick. Not sure how you're supposed to determine what "should" and "shouldn't" be negative, but i'm just glad I can finally continue my project again. Thank you very much Catwise

Blender will bake the sculpt map just fine, but simply refuses to bake an ambient occlusion map correctly. It's the only object in my project that has this problem. The baked texture appears mainly black with some barely noticeable artifacts sprinkled here and there. I also noticed that the object's lighting (highlight/shadows) looks almost inverted when draw is set to "shaded, but looks normal when draw is set to solid. I tried the steps listed for resetting the normals on machinimatrix.org to no avail.