Nikon S3100 has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Expeed C2 processor. On the other hand, Fujifilm Real 3D W1 has a
10.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features RP (Real Photo) 3D processor.
Below you can see the S3100 and Real 3D W1 sensor size comparison.
Sensor Size and Resolution Comparison image of Nikon S3100 and Fujifilm Real 3D W1 Cameras
Nikon S3100 and Fujifilm Real 3D W1 have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture.
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Nikon S3100
or the
Fujifilm Real 3D W1 ,
including hyperfocal distance.