Pin 4. NUKE 7.0 - 2D Tracker - Getting Started from Foundry on Vimeo. Auto-Tracking vs. Keyframe Tracking. For example, the hair is no longer occluding the ear, as it was in the previous example. Use the Reconcile3D node to pick a point in 3D space (ideally where you want your volumerays centre to start) and then pipe your Camera (exported from the Camera Tracker) into it. I can see my track has gone wrong, so what can I do about it? If we zoom in on this track, we can see three important things: the first is the track position, the second is the pattern window, and the third is this outer search window. If I try and track this with this Tracker, it is an instant failure. Also if we select multiple tracks, we get to see the average, the stabilized average of both of these tracks. This starts the keyframe tracking between the current pair of keyframes. The error value measures the image difference between the pattern window at the current frame 165, and the trackâs pattern window at the original frame 149. NUKE 7.0 - 2D Tracker Tutorial from Foundry on Vimeo. What we can do now is, again, pull the track into place and allow it to re-track. Click the Add User Track animation button, then Link to > Track 4. More Resources for Tracking Moving Objects in Nuke. Before going to keyframe tracking, I would just like to approach this the normal way. Essentially, we are trying to get a lock on that point, so we know we can put an object there later on. An error does not necessarily mean a bad track. I will turn off this middle icon here which creates keyframes. True enough we can see that the two patches are fairly different. I will select all four of them and hit Z to track backwards. I am just going to expand the search window at this point, and it has kicked off a re-track between those keyframes. If we go back a few frames and move the Tracker to create a new keyframe, you can see a new window appears. We have a nasty shot here - there is a lot of movement and it also looks like thereâs some rolling shutter and there are two bars that wipe all the way through the whole of the shot. Now, we have a nice smooth track. Using a larger pattern window size might give you a more stable result, the track might appear smoother and less jittery, however, it might not localize the point that you actually want to track well enough. You will probably want to edit this if you wish to add the plugin to your toolbar. You can see we now have a pair of keyframes. This places a track in the center of the Viewer. It has completely drifted. So let's now delete this track and try something more difficult. This is an extreme example to show that high motion needs large search areas. As this boat comes towards us, the pattern it is trying to track has changed, so we will just nudge it along to find the next pattern. Even though this is red, it does not necessarily mean the track has failed or thereâs a problem, it just means this is the highest error value we have seen so far for this track. Now the problem frames in the middle would throw the tracker off normally, so we would track with an offset at this point. Now the shot is stabilized, we can see how bad the rolling shutter is, so itâs possible we could have sent this shot through correction before working on it. You can see now that those points of the roto have been linked. Now, just to make sure both these image patches are the same, I will click on the keyframe patches. It is useful for fast camera movement. If we scrub on one frame, you can see the toe is now completely outside the search window. So, what we could do, is go back to our last good frame, click track forwards and hope that it works this time. Letâs move on to our next peak. The second interesting thing is this keyframe window up here. We are also no longer tracking the center of the ear as we were - we are now tracking slightly to the left. For example, if we go back to frame 200, and look at this red point here, the image patches are quite different as we saw earlier. The really useful thing is now, because we have already made a key track, if we created a new keyframe or nudged the Tracker so it creates a new keyframe, the Tracker will then re-track the affected areas in using the new keyframe. If we scrub along, you can see instantly how the track is doing. Focus on Nuke's camera tracker and learn other relevant tasks for a good track, i.e. Again, do the same for the second guy. For example, when we created this track, we created a key at frame 196. And sure enough, as the bar comes through the shot, the track bombs out completely. We have a nice, smooth change between the colors of red and green. The versatility of this node makes it possible to import tracking data from other software, for further use and manipulation in Nuke. Lastly I deal with the third guy, remember this is more of a problematic track and itâs less accurate. A high error either means the object changes appearance a lot or the track has gone wrong somewhere. I will select all four of them and hit Z to track backwards. One of the advantages of this Tracker is that it lets us have as many tracks as we like. If you remember from the previous tutorial, we can turn on the traffic light system (show error on track) to see exactly where the track went wrong. We can do this by either scrubbing along the timeline, or a handy shortcut is actually clicking on the keyframe window up here. So I go back to tracking and if I select one track, you will see we have a zoom window that shows us in detail the size of the track. I am just going to start off and introduce you to it. Hi, my nameâs Dan Ring and in this tutorial Iâm going to be introducing the new keyframe-based tracking workflow. I will use keyframe tracking to get a rough track of their positions. So I go back into the Tracker, and select track 1 and 2, right-click, and set Interpolation > Before/Linear and now those points carry on based on the extrapolation of the curve, and as you see, my Roto has continued onwards. Hi i have an doubt, it might be silly, i don't know to use scripts in nuke. If we look at the zoom window, we can see the track does not exactly follow the tip of the nose properly. grain/noise, lens distortion and 2d tracking. I will also make the search window larger, so it captures the motion of the arm. So, I will go full screen and we will work in this mode. That concludes this tutorial on the basics of the new Tracker in Nuke, and also an introduction into how pattern tracking works. To create a tracking point, I can click this icon here, and while itâs active, wherever I click we get a new tracker. So I am expecting this track to jump a bit. This updates and nudges the other keyframes further down. 2) Allows you to invert the move from Stabilize to Matchmove with a single checkbox, allowing you to check your track easily before employing it as a Matchmove. Apprendre NUKE 6. If we now go back and look at track 1, and go to the regions where the track has turned red, the image patches are still quite similar. From spill suppression to alpha math and formulas, these concepts are solidified through experience and practice. This Esc key is going to become very important when you start looking at more advanced tracking shots. You will see that when track 1 and 2 hit the bottom of the screen, they will no longer continue tracking, but tracks 3 and 4 will. Everyone I have sent it to seems to be thrilled with it, so I thought it would be best to upload it here even though I couldn't figure out the best way to distribute it through a site such as this. After the search window, the pattern window size is the next most important thing to set for tracking. Now you can see tracks within my CameraTracker, but these donât always remain, so Iâm going to use a User Track to isolate this point. Cette vidéo fait partie de la formation. Instead, I will use the Viewer to see if they are any good or not. What I like to do is use the zoom window and scroll through and see how itâs gone. Now, with the old Tracker I would have been able to adjust the search window and that would have worked for the whole shot, but because this is keyframe tracking, the search area is also keyframed and it only adjusts it on the frame I am on. To delete all of these tracks, we need to first select them. It is important to note the height of the Error Curve has now been chopped in half. To get a better look at our track, I am going to enlarge the zoom window. 3D Camera Tracker. Letâs now go back to our start frame, and adjust our pattern window size to fit just those of the nose, and then track forwards and, again, I will press Esc to cancel. Check out the Nuke in Production Series, Using the 2D Tracker here. We also have a new stop tracking button in the middle (Esc). Now we have this new traffic light system (show error on track), which would normally let us see where the tracks have any problems or not, but when they overlap like this they are not much use. We can see at the right at frame 149 that part of the ear is occluded, and then uncovered here at frame 165. Geometry Tracking and Compositing in Nuke Taught by Kirill Pleshakov . Now I have my first keyframe on frame one. A very good technique when you have noisy footage is to put lots of tracks into the same area, and average them all together. The CornerPin thus offers 2 major benefits over using a regular CornerPin for this purpose: 1) Allows you to set a reference frame for the Matchmove whilst only having to copy/link four tracks into the node, as opposed to writing out expressions for each of the other 8 From/To x/y fields. Frame 22 still has an offset, and I have keyframed the offset. Each of these allows us to say what frames we would like to track. Itâs closer, but itâs still not correct. This is a great technique when you have noisy shots like this, but also when there is heat haze or any other disturbance that will get in the way of the pattern you are trying to track. There are various 3D tracking software such as PFTrack, boujou, Syntheyes, 3DEqualizer and After Effects own built-in camera tracking, I personally prefer Camera Tracker as it integrates well in NukeX for seamless compositing (which Nuke supports … The first thing I can do is figure out why it has gone wrong. I accidentally put him in the wrong group, so move him back to Root and create new layer, again go to Link to > Track 2, go back to its own positioning, and put the roto back. As the name suggests, this centers the viewer around all of the selected tracks. But we want a better and more deterministic way of solving this problem. I have created four keyframes around the occlusion: my last good frame, my first next clean frame, and then two that are problem frames in the middle. Using keyframe tracking in Nuke 7+ can be useful in this circumstance. Then to delete them, we can either go to the Viewer and click the Delete or Backspace key, or we can use the delete tracks button here. The Tracker records the error values for all tracked frames. Description Programme Avis. Now, for this trickier example I am going to try and track the tattoo on the girlâs arm. Now that we have set up two keyframes around the selected area, from frame 101 to frame 128, I am going to click the key track current (Shift+C) button to track over that difficult region. So I am back in Nuke 6.3 for the moment, and I have a very old piece of footage that I would like to stabilize. Apprendre NUKE 6. Cette vidéo fait partie de la formation. To start the keyframe tracking, we go to the top and click the key track current button (Shift+C). The tracks selected are the ones that will be tracked when I click on track forward or track backward. Where the other two trackers stopped, you can see at the bottom of the screen, these two parts of the Roto have also stopped. Now, in this shot the bottom of the greenscreen goes out of frame. Another way to get the same stabilize effect is to use this center viewer button here. I can create new links, and what that has done is in the Tracker itself itâs created four track points, one for each of the points in the roto shape I created and selected. You can choose from blobs or corners. If we hold Shift and drag, we can magnify this zoom window even further and really get a much finer position. Things really start to get interesting when we start trying to figure out what these high error value peaks correspond to in our image. The first is by using this add track button. Author: Puru Srivastava. On top of that, it will help you get the hang of the new keyframe-based tracking workflow that we will present in the next tutorial. Instead of using the normal tracking button, I will use this new button, key track all (Shift+V). A python script that creates a CornerPin node with added parameters to behave more like a tracker. 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