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After a Stabilize from Camera Path operation (see below), the orientation of the VR sphere is fixed in space: the viewer will always perceive "north"(and every other direction) to correspond to a particular fixed direction in their viewing environment. That world-oriented view makes it easy for the viewer to understand and follow particular items in their environment.
Alternatively, if the camera is mounted on a moving vehicle, you may wish to portray a "front looking" (cockpit), "side looking" (bus), or downwards (satellite) view. You can achieve that using the Align Camera to Path script.
You run this script late in your processing and effects process, upon a world- oriented scene. (The camera path should be filtered already, if it will be.) The script re- keys the camera orientation relative to the camera path. You can set up a fixed pan/tilt offset to the path, for example 0,0 is straight ahead; 90,0 is off to the left; 180,0 is backwards; 0,-45 is forwards but down a bit.
You have the option to have the path create only the heading(pan), or both heading and tilt. By default only the heading is created, and the horizon stays level. But if you wish to better portray a plane diving towards the ground, say, you can have the tilt follow the path as well.
To minimize disruptive jitter, path keys are generated only so often, with interpolation between them. And the path's direction is determined over the course of several frames (typically +/-3), rather than just the adjacent frame.
This script can also be run on renders of meshes that are to be inserted, once they have been world-stabilized, so that they can match the path-alignment of the main footage.
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