my 3d models wont proyect properly

hi i made a simple 3d model in blender and it looks like this:

[36761-captura+de+pantalla+2014-12-09+a+la(s)+07.16.13+p.m…png|36761]

but instead, it shows up like this: (the side the camera is facing wont proyect)

[36762-captura+de+pantalla+2014-12-09+a+la(s)+07.15.55+p.m…png|36762]

any idea how to fix it?

This is the normals of your faces being inverted. Look at my answer to this question for how to fix this :

That looks like blender if I am not wrong, you can just select the whole mesh (A) and then click Ctrl+N