Same Direction for Tripod Shots

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‌Same Direction for Tripod Shots

While Distance mode addresses normal translating shots, it is clearly useless for Tripod (nodal) shots, where the camera(s) don't move. The Same Direction mode performs an analogous function for Tripod shots, trying to find a frame where the source camera is looking in the same direction as the viewing camera. This mode is intended mainly for split-take shots that must be matched to insert or remove an object. (With the same source and viewing shot, it is equivalent to Same frame mode.)

Important : You should align the two tripod shots to the same common coordinate system. That could be done by setting up a coordinate system the same way in both shots, using two trackers present in both; by using links and Tripod/Indirectly solving modes; or temporarily by some manual tweaking using the 3D panel's Whole mode.

Same direction mode initially finds the best source frame matching the first viewing frame. Subsequently it looks for the best-matching source frame to the each following viewing frame within a 30 frame window around the previous source frame. This strategy prevents it from jumping wildly around within the shot.

Same Direction considers the actual amount of overlap, not just the same direction: by considering overlap, the relative roll is accounted for as well. Note that there's nothing comparable to the Distance mode's distance in Same Direction.

After a shot is run using Same Direction mode, the utilized frame numbers are written to the Frame control track. You can examine those values to check the operation, and if necessary, edit them then switch to Absolute mode.

Reminder : if you use Distance mode for split takes, the timing of the source shot will not be constant, and may contain speed-ups, slow-downs, jumps, or drops, depending on the camera motions.

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