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Tracking the scene

From: Nuke 6.3 New Features

Video: Tracking the scene

I have restarted Nuke and reloaded the Camera Track training clip so we can take a closer look at the first step in the process, setting the track features. So we will add a Tracker node, select the Read node, go to 3D tab and select CameraTracker. The first thing we want to do, before setting the tracking, is to set the Analysis Range. By default, it's going to track the entire length of the source clip and it really means it. If you have a 500 frame clip with a 100 frame timeline, it's going to track all 500 frames.

Tracking the scene

I have restarted Nuke and reloaded the Camera Track training clip so we can take a closer look at the first step in the process, setting the track features. So we will add a Tracker node, select the Read node, go to 3D tab and select CameraTracker. The first thing we want to do, before setting the tracking, is to set the Analysis Range. By default, it's going to track the entire length of the source clip and it really means it. If you have a 500 frame clip with a 100 frame timeline, it's going to track all 500 frames.

So if you don't want to track the entire clip, select Analysis Range, and then enter the start frame and the end frame which you want to analyze. We'll put that back to default. Now, let's take a look at the Tracking tab. The Tracking tab contains two parts; the Features and the Tracking. The Features control how many trackers are placed on the screen and their distribution. The Tracking section controls the mathematics used to analyze the tracks themselves.

So let's start with the number of features. In order to see what we're doing, we'll turn on the Preview Features. To see these better, I will turn the Viewer Gain down. This allows you to see where the Feature Selections are going to place Trackers. As we adjust the Features values, you will see these trackers changing. Starting with the number of features, 150. When you finish, you want to have about 100 good tracks, and a lot of tracks get rejected over the process. So if you're going to lose a lot of tracks, you might want to increase the number of features to, let's say, 300. And now you see we have a lot more trackers on the screen.

I will put that back to default. The Detection Threshold set the distribution of features over the input image. If you enter a low Detection Threshold value, features will be tracked evenly of all parts of the image; a higher number, they will clump. Next, the Feature Separation. This forces the features to spread out, and cover the screen more uniformly. For example, I'll put in a low value here, 3, and you see how they tend to clump up over tracking features in the picture. I will set a high value like 24 and it forces them to spread out and cover more of the picture.

But, I am going to put it back to the default of 12. To show you the refined feature locations here, we will need to zoom into the picture. When you turn that on, it causes the trackers to snap to the nearest corner. If you have a lot of corners in your picture like mine, you might want to leave that on. I am going to turn that off and re-home the viewer. Sometimes you want to place trackers in particular locations. You can do that by planting what they call a seed track. With the cursor over the part of the picture you want to track, right mouse pop-up, select seed track.

We don't see anything, because Preview Features are on. So if we turn that off, then and only then can you see your seed tracks. So I will come over here, right mouse pop-up, add a seed track, over here, right mouse pop-up, add a seed track. Then I come back and turn on Preview Features, my seed tracks disappear. So don't forget, when you want to plant your seed tracks, turn off Preview Features first. Next, we'll take a look at the Tracking settings here. The Minimum Length rejects all tracks that are shorter than this value.

So if you have tracking data that have lots of real short tracks, raise the Minimum Length. The Track Threshold controls how similar features look over a number of frames. If the features are changing their appearance, you might have to lower this Threshold, so you can keep more tracks. This parameter rejects tracks that jitter too much. So if you have a lot of jitter in your tracking data, and you want to keep them, you would raise this value, so it retains more of the jittery tracks. Track Consistency will reject tracks that do not have local consistency.

If you raise this value up, you're making sure that your tracks are locally consistent. And last is Track Validation. This pertains the kind of camera move in your scene. By default, it's a Free Camera, but if the camera was mounted on a fixed tripod, and not moving, it might be panning left and right or tilting up and down, then you would choose the Rotating Camera option. If the camera is moving through the scene like this one, it's on a dolly, or a boom or maybe it's handheld, then you want to choose the Free Camera option. Okay.

Once the Tracking Tab settings are done, we go back to the Camera Tracker Tab, and select Track Features to track the shot. Next, we'll see how to refine the tracking data when doing the camera solve.

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This video is part of

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Nuke 6.3 New Features

52 video lessons · 2276 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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