System information
Tips:
n You can also select tracks to pair stereoscopic subclips. Select both tracks, right-click one of the
tracks, and choose Pair as Stereoscopic 3D Subclips. Overlapping events on the tracks are
paired as stereoscopic subclips. If there is an empty track remaining, it is deleted.
n If your camera rig used mirrors or inverted cameras and produced flipped or rotated images
that were not corrected in camera, you can correct the clip with the Stereoscopic 3D Adjust
plug-in. For more information, see "Aligning left- and right-eye views and adjusting depth" on
page 210.
Aligning left- and right-eye views and adjusting depth
It is very important that stereoscopic 3D video have differences between the views only in horizontal
displacement. Any vertical or rotational misalignment will detract from the viewing experience and may
even cause viewer discomfort. Also, it is important to limit the amount and direction of horizontal offset to
create comfortable depth.
For example, when shooting with parallel-axis cameras, all of the action is usually in front of the screen,
and you need to use horizontal image translation to push most of it behind the screen.
Use the 3D glasses in combination with viewing the output without the glasses to create good alignment
and depth settings. You usually want all of the action behind the screen plane, only crossing the screen
plane for dramatic or special effect. However, make sure never to create divergence, where the left-eye
picture would appear more than 2.5 inches to the left of the right-eye picture on the largest screen where
your movie will be shown.
For example, if the largest screen to be used is 16:9 with a 106-inch diagonal, the width is 87% of the
diagonal, or about 92 inches. With 1920x1080 content, 2.5 inches is only 52 pixels, so make sure your
distant objects are never more than 52 pixels apart.
You can use the Stereoscopic 3D Adjust plug-in to adjust horizontal offset, vertical offset, keystoning, and
rotation. This plug-in can be applied at the media level, event level, track level, or video output. For more
information, see "Applying video effects" on page 315.
You can use the plug-in's controls as follows:
Item Description
Horizontal Offset Drag the slider to adjust the horizontal alignment of the left- and
right-eye views to set the perceived position of the video relative to
screen depth.
Vertical Offset If left- and right-eye views are not aligned vertically, drag the slider to
correct the offset.
Zoom If left- and right-eye views are not zoomed identically, drag the slider
to correct the offset.
Keystone Drag the slider to correct for image keystoning. Image keystoning
occurs when the left- and right-eye cameras are not parallel.
Rotation Drag the slider to correct for camera tilt in the left- and right-eye
views.
210CHAPTER 8