PRG Mbox Designer Manual 3.8 - Manual (Page 212)

204 MBOX ® MEDIA SERVER USER MANUAL
CAUTION! Models created by external 3D modelling applications may not be appropriate for use as shutters or as
keystone rendering surfaces. Great care must be taken in UV mapping such objects when they are created. This
functionality is best matched with the simpler Topography (topo) objects created by the Mbox system.
If you are using model files on individual playback layers within Mbox as a tool for projection mapping, it is not
recommended that you also try to use a keystone model. As a general rule of thumb you will probably never
have the Objects and Keystone checkboxes checked at the same time.
Projection > Camera Setup
The Camera Setup tab allows you to add and configure a camera whose perspective will be used to render the 3D
entities selected on the Drawing Setup tab. This camera uses a true, accurate coordinate space for its position, the
point that it is looking at, and other adjustable parameters.
The camera's Eye Position and Look At coordinate are entered in generic real-world units (e.g. inches, feet,
millimeters, or meters) that must be matched to the measurement scale used when creating objects within your 3D
modeling application. For example, if your show requires projection upon a cube that is 1 meter on each edge, you
could create that cube as one unit on each edge within your 3D modeling application. In which case you would use
meters as your unit of scale when entering values on the Camera Setup tab. If you made your cube 1000 units on
each edge (as if using millimeters), then you would need to use millimeters as your unit of measure on the Camera
Setup tab.
When setting up a projection mapping system and the objects used, you must also consider the 3D coordinate origin
for your system. This should be a real-world reference point that you can mark and measure from when you are
physically setting up the objects and projector in the performance venue. Objects created for use in this system must
also be created with this origin in mind; without additional manipulation they will appear in space.
Note: Measurements use decimal notation with an accuracy of three decimal places. It is recommended that you use
a measurement scale appropriate to realistic numbers. Therefore, large projection mapping setups should not be
scaled in small units of measure like millimeters or inches.