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Glossary
Glossary of technical terms relating to JetStream Roamer.
Display Terminology
Average Frame Rate
This shows the current measured frame rate, averaged over the last
second.
Average Frame Time
This shows the time taken to render the last frame.
Average Triangle Rate
This shows the rate at which triangles are being rendered and is a
measure of how well your graphics card is working.
Culling
Culling is a process for determining items not to draw during the render
of a scene. JetStream does a level of prioritized culling with the drop-out
method of rendering interactive scenes, but you have a certain level of
control over other aspects of culling such as backface, near and far
planes.
Drop-Out
In order to maintain interactivity and guarantee a user-defined frame
rate, JetStream only renders what it can in the fraction of a second it has.
The remainder is "dropped out", or not rendered. However, JetStream
prioritizes what is rendered and what is dropped out based on size of the
item's bounding box, distance from viewer and size on screen, so only
the less significant items in the scene are dropped out. Once navigation
has ceased, the scene continues rendering until all items are visible.
Frame Rate
The frame rate is the number of frames per second (FPS) that are
rendered in the main navigation window. JetStream guarantees a
user-defined frame rate in order to maintain interactivity.
Export Terminology
These are terms specific to JetStream that are used in relation to exporting.
Codec
Codec stands for "COmpression-DECompression" and is a program that
compresses and decompresses animations when creating and playing
back .avi files. Codecs are installed independently of JetStream and are
available when installed on your Windows™ system and the same codec
that was used to create an .avi file is required to play it back.
File Terminology
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