“ProjectorControl.gui” is an application that allows you to easily switch your
projectors ON or OFF at the click of a button. This application is typically
set up on your SOS computer by the SOS Team during installation.
If this application is not already running on your SOS computer’s Desktop,
double click the “Projector Control” icon located on the Desktop. Then, click
the “Turn Projectors ON” button.
If this application was not installed at your site, turn on each projector by
using the projector’s remote control.
At high altitudes, a projector can overheat due to low air density. If your
site is located at a high altitude, set this mode to ON. This will allow the
projector to operate with a faster fan speed to prevent damage.
If a room is reasonably dark, use the projector’s lower lamp mode setting (if
this feature is available). If the room is bright, set the projector to a
higher lamp mode setting for greater light output. In general, all projectors
should have the same lamp mode setting so that one projector is not brighter or
darker than the others.
If your projector has the option for vertical lens shift, shift the lens down
to its lowest point. This is typically the standard point at which a projected
image shoots straight out of the projector without any vertical shift. If your
projector has horizontal and/or diagonal shift, keep these shifts at their
If your projector is mounted such that it is tilting up or down instead of
mostly straight, you may have to use the projector’s keystone correction
feature to make the projected image more rectangular. For most sites, however,
the use of keystone correction is avoided.
The projector’s resolution should be set to its native resolution. Many
projectors offer a higher resolution option that is greater than the native
resolution. Regardless, you still need to use the projector’s native
After the lens shift has been adjusted, adjust the projector’s zoom (either
manually from the projector’s lens or via the projector’s remote if this option
is available). To figure out how far to zoom in or out, first open the Red Ball
onto the sphere (see the Red Ball Alignment section). The Red Ball should be
fairly centered on the sphere due to physical projector placement. Then, adjust
the zoom so that the Red Ball overshoots onto the wall behind the sphere only
slightly. Finally, focus the image by looking at the center of the sphere near
the equator and using the focus adjustment on the projector or projector’s
Measure the height (in inches) from the ground to the sphere’s equator.
Write this value down
For each projector, measure the height (in inches) from the ground to the
center of the projector’s lens. Write each value down
For each projector, measure the distance (in inches) from the center of the
projector’s lens to the center of the sphere. Write each value down.
Write down the native resolution of the projectors, the number of projectors
in the display, and the total degrees used by the display (for example, 4
projectors covers 360 degrees longitude, while 3 projectors covers 270
Log on to the main SOS computer as the user “sos”. The sos account is set up
with administrative privileges and is necessary for editing alignment files.
The sos account password will be what was provided to you during
Open the SOS Configuration
by selecting the “Edit SOS Settings” option in the SOS Utilities application
on your Desktop. (If you are using SOS version 5.4 or below, you will have
to directly edit and save changes to the
called “sos_stream_control.config”, which is located in the directory
/home/sos/. Go ahead and open this file)
Modify the appropriate values in the config manager to match what you wrote
Save the configuration and then close the manager
Step 4: Start the SOS Application on the SOS Computer
In order to perform projector alignment, the main SOS application, called “SOS
Stream GUI”, must be open and running on your SOS computer. If it is not
running, double click on the “Start SOS” icon located on the SOS computer’s
Desktop to launch the application.
Step 5: Open the Alignment Interface in the SOS Remote App
To reset the projectors to their default alignment settings, tap on the
“Factory Reset” button located on the Alignment page. A warning message will
pop up. Select “Yes” to proceed with the Factory Reset.