9, LightWave compensates and the image
looks correct. An NTSC television pixel aspect ratio might not always be exactly .9, but it
won??™t be 1.0.
Field Rendering
Beneath the Resolution and Multiplier options in the Camera Properties panel you??™ll see
the Field Rendering option. Like the Aspect setting, this setting is used when preparing
animation for output to analog videotape. Activating field rendering tells LightWave to
mimic the process analog video devices use to ???draw??? images on television screens: Each
frame of video is divided into two fields, one consisting of the even-numbered horizontal
rows of pixels and the other consisting of the odd-numbered rows. First, one field is
drawn and then the other, completing the frame via a process called interlacing. (NTSC
video draws screen images at a frequency of 30 frames per second, or 60 fields per second.)
Standard 3D renderings are not interlaced, which generally means higher quality, but
playing them back on interlaced devices can make motion look choppy, especially when
objects are moving swiftly and close to the camera. Field rendering lets your animations
synchronize better with an interlaced display, so motion looks crisp and clean.
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