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Correcting tracking drift

From: Nuke 6.3 New Features

Video: Correcting tracking drift

Now that the target has been tracked, the Stabilize view has revealed some drift in the tracking data. Fortunately, the Planar Tracker node has some elegant tools for correcting the drift. Watching this right-hand corner here, you see how it's drifting out at end of the shot, whereas at the beginning of the shot, it's right on target, so let's fix that. We'll stop the playhead, we'll go to the last frame, making sure we have our Planar Surface on, our Planar Surface adjusting tools, and our grid. Come down here, and we'll grab that point, and pull it over to line it back up where it belongs.

Correcting tracking drift

Now that the target has been tracked, the Stabilize view has revealed some drift in the tracking data. Fortunately, the Planar Tracker node has some elegant tools for correcting the drift. Watching this right-hand corner here, you see how it's drifting out at end of the shot, whereas at the beginning of the shot, it's right on target, so let's fix that. We'll stop the playhead, we'll go to the last frame, making sure we have our Planar Surface on, our Planar Surface adjusting tools, and our grid. Come down here, and we'll grab that point, and pull it over to line it back up where it belongs.

Notice, it turned cyan. So we now have three colors for the Planar Surface: cyan for a keyframe, blue for a track frame, and jumping to the first frame, yellow for the reference frame. Now when I scrub through the playhead, you can see the drift is gone. Okay, back to Frame 1. Now that we have some tracking data we believe in, let's use it to track an element onto the face of the cube. Let's get our screen space back where it belongs. I'm going to home the viewer with the H key. I'll turn off the Viewer Center mode, I'll turn off the Planar Grid, and turn off the Planar Surface adjustment tools.

What I'm going to do is export a four corner pin tracking data to a graphic element, which will lock it to the four corners of the Planar Surface; not the tracking shape. Okay, let's go get an element. So from our Read node, we'll select the Project Media folder, our Lesson_06_Media, and our Nuke logo. We'll open that; okay. With the Read node selected, we come up to the planar tracker controls, the output pop-up menu, and select CornerPin (absolute). That means I want to corner pin that graphic absolute inside my yellow planar surface.

We'll select that, and it hooks it up to the logo. And if I use Alt+E, you can see that it's linked to the Planar Tracker node. All we have to do now is attach a Merge node by typing M on the keyboard, hook that up to our original clip, and there is a composite. Now I can turn off my Planar Surface, and then I can type O in the Viewer to just eliminate all of the overlays, and now we can play our track element on the background.

Now that we have an idea of the overall planar tracker workflow, we can back up, and take a closer look at some more of the controls and options, as well as how to handle special cases.

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This video is part of

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Nuke 6.3 New Features

52 video lessons · 2277 viewers

Steve Wright
Author

 
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  1. 2m 10s
    1. Welcome
      1m 50s
    2. Using the exercise files
      20s
  2. 9m 0s
    1. Building the mesh
      4m 12s
    2. Projecting images on the mesh
      4m 48s
  3. 26m 6s
    1. Exploring basic setup
      6m 21s
    2. Using camera track points
      10m 5s
    3. Understanding how to do a corner pin
      9m 40s
  4. 7m 22s
    1. Demoing the PointsTo3D node
      45s
    2. Using the PointsTo3D node
      6m 37s
  5. 15m 28s
    1. Setting the locators
      5m 4s
    2. Keyframing the locators
      2m 30s
    3. Doing the camera solve
      5m 34s
    4. Creating 3D cards
      2m 20s
  6. 5m 27s
    1. Working with the GeoSelect node
      5m 27s
  7. 8m 58s
    1. Understanding the Displacement node
      5m 19s
    2. Working with the ScanLineRender settings
      3m 39s
  8. 8m 49s
    1. Using the AudioRead node
      8m 49s
  9. 7m 44s
    1. Deep compositing briefing
      7m 44s
  10. 32m 55s
    1. CameraTracker overview
      7m 3s
    2. Tracking the scene
      4m 48s
    3. Solving the camera
      5m 28s
    4. Building the 3D scene
      6m 48s
    5. Adding 3D geometry
      8m 48s
  11. 9m 18s
    1. Tracking the scene
      4m 52s
    2. Filtering the point cloud
      4m 26s
  12. 19m 59s
    1. Analyzing the image
      8m 5s
    2. Exploring three workflows
      7m 18s
    3. Using the STMap node
      4m 36s
  13. 19m 41s
    1. Modeling new 3D geometry
      6m 46s
    2. Lining up 3D objects
      3m 16s
    3. Building the whole set
      7m 4s
    4. Exporting Modeler geometry
      2m 35s
  14. 1h 0m
    1. Exploring the PlanarTracker workflow
      6m 47s
    2. Correcting tracking drift
      2m 40s
    3. Coping with tracking occlusions
      6m 30s
    4. Tracking with multiple shapes
      6m 34s
    5. Tracking out-of-frame targets
      5m 32s
    6. Placing the planar surface out of frame
      4m 35s
    7. Exporting: corner pin (relative)
      4m 24s
    8. Exporting: Tracker node
      4m 24s
    9. Exporting: corner pin (stabilize)
      5m 15s
    10. Adding a roto shape to a track layer
      3m 42s
    11. Adding multiple roto shapes to a track layer
      3m 24s
    12. Using the mask input
      6m 40s
  15. 46m 20s
    1. Using the ParticleEmitter node
      4m 26s
    2. Creating particles
      4m 42s
    3. Adding emitters
      5m 59s
    4. Adding forces
      8m 18s
    5. Bouncing particles
      5m 28s
    6. Changing particle appearance
      7m 21s
    7. Adding streaks
      5m 42s
    8. Setting streak attributes
      4m 24s

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