How to select faces inside model? Here the author selects only faces inside of the model. In my case, I can't select only inside. I am using border select.

 

Is there any way to select faces inside without selecting faces on the surface?

Here is my file:

http s://drive.google.com/open?id=0B_-tV3odolwlaTM1bjZLRDF6U1Evv
There are several ways to do that, but first, change triangles to quads by selecting all faces and pressing ALT+J in edit mode.Here is what you can do to select only inside faces:


Hide the rim, select one inside face, CTRL+L to select linked.
Mark seam around the rim, select one inside face and CTRL (it doesn't work with vertices, must be with faces)