Toshiba Satellite P850 - Manual (Page 90)

Do not cover the Web Camera when watching 3D videos.
Do not dim the lights in room when using the Glasses-Free 3D Function.
The Glasses-Free 3D Function will not be working when moving beyond
the range of the Face Tracking.
Glasses-free 3D function will work with only one of the applications that
support this function at the same time (e.g. when running the applications
including TOSHIBA Blu-ray Disc™ Player, Game and GeForce 3D Photo
Viewer at the same time, the glasses-free 3D function can be enabled with
only one of these applications).
When the glasses-free 3D function is enabled, changes in your facial
expressions (e.g. making faces, frequently blinking or squinting eyes) or
head position may cause flickers on the 3D photo/video you are watching.
This is a normal behavior of the Face-Tracking function.
Viewing Range Limitations
The sitting distance and viewing angle for Glasses-Free 3D Function are
described below.
Distance 0.6 m (recommended) away from the center of
the LCD.
Viewing Angle Perpendicular to the LCD.
Figure 4-9 Viewing Range
0.6M
Using the X-Tune Utility
The X-Tune utility provides an easy way to enhance the 3D stereo effects.
You are recommended to use this utility to optimize the 3D stereo effects
when using the Glasses-Free 3D function for the first time or being
unsatisfied with the 3D effects.
User's Manual 4-26