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Tracking awkward surfaces

From: mocha 2.6 Essential Training

Video: Tracking awkward surfaces

There are a couple of more tracking cases here I wanted to show you and I am again using the Motion Demo clip from the Lesson_2_Media folder. This surface down here, when I play the clip, it's rotating kind of like a turntable. This is the kind of tracking target you would get if you had a camera orbiting something. So let's see how we might track this. I am going to go back to frame 1, draw an X spline around the perimeter and I am going to pull the corners nice and sharp, oops! Let's turn off the Planer Surface, we don't need that and tuck it in kind of tight.

Tracking awkward surfaces

There are a couple of more tracking cases here I wanted to show you and I am again using the Motion Demo clip from the Lesson_2_Media folder. This surface down here, when I play the clip, it's rotating kind of like a turntable. This is the kind of tracking target you would get if you had a camera orbiting something. So let's see how we might track this. I am going to go back to frame 1, draw an X spline around the perimeter and I am going to pull the corners nice and sharp, oops! Let's turn off the Planer Surface, we don't need that and tuck it in kind of tight.

Okay, I am going to turn off the Shear, so we're only tracking the Motion for Translate, Scale and Rotation. Let's see how that works, tracking forward. Yikes! I am getting divergence almost immediately. All right, that's not working. We'll push that back. Now I'll turn on the Shear and the Perspective and try it again, see if that's better. Okay, that's looking better, but I'm still getting some divergence over here and over there. What's happening is the planer tracker is becoming confused by the background mixed with the edges of my target.

So let's try that again back to the beginning. Now I am going to move all of the control points to set the spline just inside the surface, so the tracker will no longer see any of the edges out here. Okay, let's try tracking it now. The tracking spline no longer incorporates pieces of the background into the edges of the target.

So the planer tracker has a much better time of it. Well that actually looks pretty good. We'll scrub though the shot, and say that's seems to be sticking, but the proof of the pudding is the Planar Surface. So let's turn our Spline off and the Planer Surface on. Remember, you can be on any frame when you line up the Planer Surface. So watching our zoom windows in the upper-left hand corner, we'll line this up real tight with our target. There! Okay, now let's see how well it sticks.

Well, that's looking pretty darn good. We'll stop that. Okay! For these rotating surfaces kind of shots, you can see that moving the tracking spline to the interior helps quite a bit. We're done with that, so we'll delete that spline and take a look at another case, the globe. The globe of course is a spherical object. it's not a planer surface. The problem is-- let me zoom in on that -- we have a lot of surfaces we would like to track that are like this, most notably the human head.

The human head is more like a globe than a plane and people are always rotating there heads. So this is a real common tracking problem and it's not a planar surface. It's a round surface. So let's see what we can do. I'll select the X spline. draw a nice shape around here. Oops! Let's turn off the Planer Surface again, relax the tension, so we get a nice smooth curve all the way around, to adjust my points.

Okay, now let's track it forward using the default motions and of course the planer tracker seized this surface as a single flat plane and attempts to keep the tracking spline locked on to it. Of course, that's wrong because it's a curved surface. But it did a very nice job and locking onto it even then. Okay so what are we going to do? Well, we go back to frame 1 and try a new tag. What we are going to do is keyframe the shape on the globe. This way the rotation of the globe will not throw the shape off, but before we do that we have to get rid of all the tracking data.

Of course, we have tracking data, this movie and this spline, so to get rid of it I'll select Manual Track. We'll click in the Viewer and now we can see the keyframes for all the tracking data. So we'll select Delete all keyframes and we will get this confirmation because when you click Yes, you are going to delete all your tracking data. So I'll click Yes. The tracking data is gone. Make sure you select the Large Motion when you're done. Now to prove the tracking data is gone, I scrub the clip and the spline no longer moves.

All right! So, let's keyframe the spline, I'll slide down here and click on the Keyframe button to establish a keyframe there, come down here, add another keyframe here, another keyframe and at the end one more keyframe. Okay, we'll go back to the beginning and track it again with the exact same motion settings we have before, track forward. Now the tracker is trying to move the spline, but the spline has keyframes.

So you're seeing the spline kind of like torn between the tracker and its keyframes. However, once it finishes, the tracker is now locked onto our target. This is what we saw earlier when we did the keyframe on that brown wall. All right, we will stop that, jump back to the beginning of the shot, rehome the viewer and we'll delete this layer. So the moral of the story is this even when the planer tracker is asked to track on a non-planar surface, it can still collect useful tracking data that will speed up your rotoscoping work.

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This video is part of

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mocha 2.6 Essential Training

49 video lessons · 7732 viewers

Steve Wright
Author

 
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  1. 5m 23s
    1. Welcome
      1m 40s
    2. Getting to know the user interface
      3m 43s
  2. 1h 7m
    1. Drawing X-splines
      8m 2s
    2. Drawing B-splines
      5m 4s
    3. Editing splines
      3m 52s
    4. Keyframing splines
      6m 33s
    5. Discovering the timeline controls
      5m 52s
    6. Walking through the New Project window
      4m 23s
    7. Working with interlaced clips
      8m 19s
    8. Setting the color space
      4m 46s
    9. Defining mocha preferences
      3m 46s
    10. Walking through the Layer Control panel
      3m 22s
    11. Walking through the Layer Properties panel
      3m 29s
    12. Viewing mattes
      3m 41s
    13. Walking through the Edge Properties panel
      6m 24s
  3. 1h 8m
    1. A planar tracking demo
      6m 36s
    2. Setting motion options
      13m 12s
    3. Adjusting the tracking spline
      8m 51s
    4. Tracking awkward surfaces
      6m 3s
    5. Understanding the planar grid
      6m 50s
    6. Dealing with lens distortion
      7m 43s
    7. An AdjustTrack demo
      5m 49s
    8. Keyframing the AdjustTrack
      7m 48s
    9. Offsetting reference points
      5m 49s
  4. 1h 8m
    1. Strategizing shape distribution
      11m 21s
    2. Working with large areas
      2m 44s
    3. Selecting a start frame
      10m 38s
    4. Replacing a shape
      2m 54s
    5. Keyframing: Bifurcation
      4m 38s
    6. Keyframing: Straight ahead
      5m 17s
    7. Keyframing: Extremes
      9m 22s
    8. Keyframing: Maximum digression
      6m 45s
    9. Converting to stereo
      2m 54s
    10. Inspecting your rotos
      4m 43s
    11. Rendering mattes
      4m 45s
    12. Exporting shapes
      2m 54s
  5. 1h 30m
    1. Moving the camera with parallax
      5m 30s
    2. Moving the camera without parallax
      3m 58s
    3. Using multiple splines in a layer
      7m 23s
    4. Subtracting shapes
      7m 6s
    5. Stabilizing the viewer
      5m 46s
    6. Keyframing during tracking
      7m 24s
    7. Unlinking the tracker
      5m 8s
    8. Tracking manually
      12m 35s
    9. Defining corner pinning
      5m 4s
    10. Going further into the Track tab
      6m 53s
    11. Utilizing the more advanced AdjustTrack features
      8m 40s
    12. Working with the Stabilize tab
      6m 11s
    13. Exporting track data
      8m 53s

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