5.Delete the audio and video tracks you created in step 1.

After synchronizing the events, you will have a paired stereoscopic subclip in the Project Media window. You can drag these clips to the timeline as stereoscopic 3D media.

Tip: 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 55.

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 percent 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 event level, track level, or video output level. For more information about applying video effects, see Adding video effects on page 47.

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.

 

 

Auto Correct

Click to analyze video and automatically calculate values for Vertical Offset, Zoom,

 

Keystone, and Rotation.

 

 

Flip Horizontal

Choose a setting from the drop-down list to flip the image for horizontally inverted

 

cameras.

 

 

Flip Vertical

Choose a setting from the drop-down list to flip the image for vertically inverted

 

cameras.

 

 

Automatic Crop

Select this check box if you want to automatically crop the left- and right-eye views

 

during adjustment to prevent black borders created by the plug-in’s adjustments.

 

 

Crop

When the Automatic Crop check box is cleared, you can drag this slider to adjust

 

image cropping.

 

 

Tip: 3D depth adjustment is a complex process and is out of the scope of this document. For more information, please review a

reference such as 3D Movie Making: Stereoscopic Digital Cinema from Script to Screen by Bernard Mendiburu.

STEREOSCOPIC 3D EDITING 55