Check for a Smooth Camera Path

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‌Check for a Smooth Camera Path

You should also check that the camera or object path is satisfactorily smooth, using the camera nodes in the graph editor. We’ve closed the Active Trackers node, and exposed the Camera & Objects node and the Camera01 node within it. We’re looking at subset of the velocities of the camera: the X, Y, and Z translation velocities.

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There’s a spike around frame 215-220, to find it, expose the Active Trackers, select them all (control/command-A), and use Isolate mode around that range of frames. The result:

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We’ve found the tracker that causes the spike, and can use the deglitch tool

, or switch back to the tracker control panel and camera viewport, unlock the tracker, correct it, then re-lock it.

Tip : In the capture above, the selected tracker is not visible in the hierarchy view. You can see where it is in the scroll bar, though—it is located at the white spot inside the hierarchy view’s scroll bar. Clicking at that spot on the scroll bar will pan the hierarchy view to show that selected tracker.

If that is the last glitch to be fixed, switch to the Solve control panel, and re-solve the scene using Refine mode.

You can also use the Finalize tool on the tracker control panel to smooth one or more trackers, though significant smoothing can cause sliding. If your trackers are

very noisy, check whether film grain or compression artifacts are at fault, which can be addressed by image-preprocessor blur, verify that the interlace setting is correct, or see if you should fine-tune the trackers.

Alternatively, you can fix glitches in the object path by using the deglitch tool directly on the camera or moving object’s curves , because it works on any changeable channel. You can also move the object using the 3-D viewports and the tools on the 3-D panel, by repositioning the object on the offending frame.

Warning : If you fix the camera path, instead of the tracker data, then later re- solve the scene, corrections made to the camera path will be lost, and have to be repeated. It is always better to fix the cause of a problem, not the result.

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