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Marquee ACON Ultra Installation/Operation Guide

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2.3.4.3

The Screen Geometry test point set

The Screen Geometry test point set is arranged at regular intervals
around the outside edges of the screen.  The geometries that are
controlled during this pass affect the entire screen, so the density of the
test points should be sufficient to observe any shifts in these
geometries.  Each test point includes a horizontal and a vertical
measurement of the intersection location.  This section will first detail
the long method of creating a valid Screen Geometry test point set and
then will give details on how to perform the same setup steps using software routines introduced with
the software version 2.0.

2.3.4.3.1

Using a build pattern (the long method)

To initially obtain the locations of the Screen Geometry test point set, first pick a screen vertex, or
other identifiable edge feature, then trace a regular pattern – the build pattern – around the edge of
the screen.  The choice of initial feature needs to allow the user to readily position the camera field of
view.  The exact pattern may change as long as sufficient points are obtained to observe all screen
based geometry changes.  All test points should be located close to the edge of the facet.  A build
pattern chosen could be “every other horizontal line gets a new test point”; or “every third vertical line
gets a new test point”.  The adjacent drawing indicates a counter-clockwise pattern direction;
however, the direction chosen is irrelevant to the test point set.

A build pattern typically used for initially establishing Screen Geometry test points is to select the
intersection nearest the center top of the facet as the first test point; then, in a clockwise or counter
clockwise direction outline the edges of the facet by placing a test point on every other horizontal line.
When tracing a horizontal facet edge, place a point on every other vertical line.  Always position the
test points near to the edge of the screen.  If either line of a desired intersection is less than ½ the
length of a complete grid box from the edge of the screen, the intersection is too close to the edge of
the screen and should be repositioned further from the perimeter.

While following the build pattern a collection of controls from the

Screen Geometry Maintenance

Window

are provided to facilitate creating the test points. This window allows the user to view and

modify a single test point at a time. One of three selection controls allow different test points to be
viewed – the test point being viewed is considered the active test point. When the control advances
the active test point, the camera is indexed to that test point’s location and that test point’s visibility
settings are sent to the projector.

From within the

Screen

Geometry Maintenance Window

start at a recognizable feature of the facet

and set the first point based on this feature. Choose an intersection close to the feature and store the
motor coordinates into the first test point in the set. Using the

Motor Control Tab,

index the camera to

the intersection indicated by the build pattern to be next (e.g. move the field of view two horizontal
lines down, and one line left). Press the

Advance and Set button

to store the current motor

coordinates into the next active test point. If the current test point is the last in the set, this button will
create a new test point (up to a total of 50 points), set that point as the active point, and then store the
current motor coordinates. Once the entire screen has been traced, any additional test points in the
set (that have not been used), should be removed from the set with the

Delete

button.

Facet edge