Output Shutter Fixture - PRG MBOX User Manual

Corner Controls
The Keystone Corner Control parameters adjust the X/Y position of each of the four corners in the image, and may be
used to square up an output image that has been distorted due to projection from an oblique angle. As the corners are
adjusted the geometry of the output image is also adjusted to correct for perspective skewing. These controls are 16-bit
for greater precision and allow the corners to be moved both inwards and outwards.
Linearity
The Linearity parameters move the center of the keystone surface to the left/right and up/down without moving the
corners, allowing the output image to have compensation for oblique projection angles where some pixels become larger
than others due to a greater distance from projector to projection surface.

Output Shutter Fixture

The Output Shutter Fixture may be used to apply 2D shuttering that can obscure portions of the output, but which does
not affect any other outputs from the server. The shutters can be thought of as sitting between the composited imagery
of the output and the virtual camera that provide the view of the imagery. Both Mbox Studio and Mini have reduced
shutter functionality when compared to Designer.
Shape
The Shutter Shape parameter enables the shutter controls and selects which shape (Moving Light/Leko/Iris/Blob) is
used. The Moving Light mode is recommended for most normal usage, where individual sides of the output image need
to be cropped.
Note: The default value for the Shutter Shape parameter is 0, which turns the shutters off. This parameter must be set to
one of the four shapes for the shutters to work.
Color
The Shutter Color parameters allow an additive RGB color to be applied to the shutter blades. All four shutter blades
share the same color.
Shutter Edge
The Shutter Edge parameter adds a blur to help soften the leading edge of the shutters so as to aid in creating a more
subtle shuttering result or to create a vignette effect. The softened edge of the shutter is centered on the line of the
original shutter edge.
Shutter Controls
When using the Moving Light shape, the Shutter Controls adjust the position of each end of each shutter blade. When
using the Leko shape, these controls are used to set shutter Insertion (the A control) and angle (the B control). The
shutter controls have no effect when using the Iris shutter shape. Finally, when using the Blob shutter shape, these
controls work in the same manner as with the Leko shape, but a Bezier curve is drawn between the center points of
adjacent shutter blades, allowing for non-linear shutter compositions.
Shutter Position
The Shutter Position parameter allows the shutter blades may be moved as a unit left/right and up/down without
affecting their position relative to each other.
MBOX® USER MANUAL
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