Tagged nuke. It is useful for fast camera movement. Bring up the Tracker in the same way as we did before, and as you can see already, there are a number of differences. After the search window, the pattern window size is the next most important thing to set for tracking. What we can do now is, again, pull the track into place and allow it to re-track. While that’s a mouthful, what it in essence means is that you can track a mesh of points inside a defined spline. We expect this behaviour as most interesting objects change appearance over time, and this error value measures the change in appearance from our grab frame and our current frame. As expected, the two image patches are very different, even more so than the last time. Apologies for this. I now have one super track, in this case based on six tracks, but in the past I used sixteen or more trackers to get a good track. I will just go back to full-screen mode and create a new track. Hello and welcome to this tutorial on the new Tracker in Nuke 7.0. We would start off in exactly the same way as we would with normal tracking. So let’s see how Nuke 7.0 gets on. This starts the keyframe tracking between the current pair of keyframes. I have included in the script the paragraph whereby i added it to my toolbar, even though I can't seem to include the icons it refers to. You can see a couple of high peaks for our track. 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. We are also no longer tracking the center of the ear as we were - we are now tracking slightly to the left. Set this to tell Nuke when throws out the track point. I will create a keyframe so the second pattern is clear, go forward a frame, and create one more keyframe. Looking at the traffic lights, we can see the issues caused by motion blur, and actually even though it has gone red it’s a good track. I can see my track has gone wrong, so what can I do about it? You are imparting new information into the system, which gives you a better overall track. Hello! As I scroll across the timeline, you can see the bar will come and wipe through, so we know from experience that will not track. In The Foundry’s Nuke, several top of the line keying packages are right there from your first launch, but their application is far more complicated than a simple drag, drop, and adjustment.To key well in Nuke you need an expert understanding of several concepts. I will use the Shift key to start a track. Tracking camera movement in a 2D footage enables you to add virtual 3D objects to your 2D footage. To clear the track animation path, we can then use this clear all button up here. I will put a second keyframe here, and now I have two keyframes. To do this, let’s go back to our original starting frame and clear all of this track data. The second way to create a track is to use the add track button up here, which when toggled on, allows us to quickly create tracks anywhere we click the mouse. You can see the keyframe track proceeding forwards in the shot, and although it looks like it’s doing the same thing as the auto-track we showed earlier, it is actually trying to match the current pattern window against both search windows of the keyframes, but also keeping the track position of the two keyframes locked. Now I have my first keyframe on frame one. I could also hold the Shift key down and click anywhere at any time to add a new tracker. We will start by loading up the Tracker node. -The usual way to do a 4-point track in nuke is to use the Tracker node and then copy the tracks into the "to" fields of a CornerPin node. One thing to remember here is that there is no objective way to say if a given error value is good or bad. The tracks selected are the ones that will be tracked when I click on track forward or track backward. The Foundry Visionmongers Limited is registered in England and Wales. 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. The Point Cloud Generator is a NukeX Only node that creates a dense point cloud…using a solved camera and the original clip.…This dense point cloud can then be used both to help line up 3D geometry in a…scene or in conjunction with the PoissonMesh node to create 3D Mesh Geometry.…Let's go get a clip, so we'll get a Read node, select our Project Media go … To show you what I mean, I am going to start a track and pause it halfway through. Nuke's tracking functionality overall just isn't that great. Now, because I have this function on, re-track when keyframe is moved, this means if I make any adjustments to the Tracker between track keyframes, it will automatically fire off a re-track. Hi i have an doubt, it might be silly, i don't know to use scripts in nuke. Hope you enjoyed this, thanks for watching. The object you are tracking in would then be matchmoved from its original four corners to wherever the four tracks are on any given frame. We head down to a bit further down this shot, create another keyframe, again to help the Tracker. In this video tutorial David Scandlyn shows you how to create a track matte inside of The Foundry's Nuke. Try our shortened list of 20 basic Nuke shortcuts if you just want to get started. You can see we chopped that mountain of error in half. So lets go back into the CameraTracker and create a Camera, bring up a Scene, and through this we will be able to check the integrity of this track. I have only keyed 60 frames, not the whole lot this time, but I will key track them anyway and just track those 60 frames. The error is now shown on the animation path of the track in terms of traffic light colors, where red means high error, and green means low error. This is the Error Curve for our track. This finds each pair of keyframes and tracks them sequentially, for example, these three pairs. 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. 2h52 49 leçons. Let’s create a new track. 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. To see this, we can toggle this new switch called the show error on track button. Once you've collected this track data from the selected point, you then apply it to another element or object. Tracking is easy Whether you want to create keyframes from real life footage with 1 or 4 point track, Nuke's 2D tracker has a variety of options and menus to make the tracking easier for you. You can see now that the toe has been correctly found in the next frame. You can do this in a couple of ways. Viewing Solve Data. You can see around the orange and red dots, the track has really drifted. It will give us the best result, as it basically locks the filter to keys. When I am happy, I can select all of the tracks, and the new average tracks button will combine all of the tracks into one keyframed track. The versatility of this node makes it possible to import tracking data from other software, for further use and manipulation in Nuke. Description Programme Avis. Now click Track Features. We can look at it in the zoom window, and as you can see, it has already drifted. 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. This is probably the quickest and easiest way to create lots of tracks. About 90% of all failed tracks can be generally fixed by increasing the search window size to match the amount of motion of the object and also its direction. You can see now that those points of the roto have been linked. 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. So, we have a very nice and fast workflow. Dave shows some techniques for achieving a better track and solve and looks at how to refine a 3D scene in Nuke using the 3D camera tracking data. So just close this track for the moment, and just look at the Roto. For example, let’s do this track again and I will cancel it mid way. This is actually really important when we are tracking. Conventions. What I like to do is use the zoom window and scroll through and see how it’s gone. I can create new links, and what that has done is in the Tracker itself it’s created four track points, one for each of the points in the roto shape I created and selected. Please login in order to download these files. So, through using the Tracker in a combination with Roto we have been able to garbage out the people, and we have also added a User Track to the CameraTracker, so we have been able to put an object in a position of our choice. Again I put him in his own group, then Link to > Track 3, and again put the shape back where we started. I will select all four of them and hit Z to track backwards. You shouldn’t adjust these values manually. There are a lot of luminance changes and lots of noise, all sorts of problems. Click the Add User Track animation button, then Link to > Track 4. If we scrub on one frame, you can see the toe is now completely outside the search window. There are also some good tips in here for getting a good track using averaged tracking data from multiple tracked points in Nuke. The image is moving around a lot, so increase your search area and then track forwards and see what happens. The way pattern tracking works is, it grabs this pattern on one frame and then tries to match it within the search window of every other frame. Before going to keyframe tracking, I would just like to approach this the normal way. This is expected as we are not exactly tracking the pixels of the nose; we are using those of the face and the background as well. You can see now that those points of the roto have been linked. 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. We have 2416 guests and 91 members online. Cette vidéo fait partie de la formation. Camera Tracking. This allows us to see how the track is doing better. The key to solving this is to make sure the search window is large enough so that it can contain the toe within the next frame. 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. Click the set keyframe button, which adds a keyframe at frame 101. Now I want to check my track. Now, in this shot the bottom of the greenscreen goes out of frame. Focus on Nuke's camera tracker and learn other relevant tasks for a good track, i.e. Then with a green circle Nuke will show you a good candidate for tracking, and then snaps a tracker to that point. And more importantly, we want that all in the Viewer. So if I will have a keyframe on frame 1 and a keyframe on frame 30, and I was on frame 20, it would track from frame 1 to 30, for example. 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. Thanks for watching. GeoTracker started as an in-house tool for Roman Belov. Motion tracking, in its simplest form, is the process of tracking the movement of an object within a piece of footage. So, I’m going to do just that and skip on another 25 frames. Now the shot is stabilized, we can see how bad the rolling shutter is, so it’s possible we could have sent this shot through correction before working on it. I will hide the progress bar for the moment, and I will create a track in the same position as we did in Nuke 6.3. Now, let’s start creating some tracks. So the difference between these two image patches is what gives us our high error value here in the Curve Editor. A high error either means the object changes appearance a lot or the track has gone wrong somewhere. 2h52 49 leçons. This creates a new keyframe at frame 113, and then starts re-tracking between our new pairs of keyframes at frames 101 and 113, and 113 and 128. Apprendre NUKE 6. The problem then is it might not localize the feature you want to track properly. For most project the default 0.7 is useful. Then I create a second track on this guy here, go through and make keyframes, and click key track all. But at the same time reducing it will cause lower tracking quality and more tracking … Back in Nuke 7.0, I bring up the new Tracker. You can see that the border of the keyframe turns orange if we are on the same frame as that keyframe. I am using Stabilize 1pt here, as if I only have 1 tracker. 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. But at the same time reducing it will cause lower tracking quality and more tracking data. What that means is that we expect the image patch for this frame to be fairly different from the image patch we originally grabbed at frame 149. The Esc key stops the tracking and C will track forward a frame at a time, and back to the V. Working this way makes it very, very fast to set up tracks to do your tracking. To create a tracking point, I can click this icon here, and while it’s active, wherever I click we get a new tracker. So, you can see if we skip on one frame that our original pattern is contained nicely within the search window here. As we can see, that track is good enough to cover him throughout again, as we are only garbage matting him. It can mean there was a good track, but it found the pattern to be different but still got the track correct. You will also notice we now have hotkeys for the main tracking parameters, C and V for going forwards, X and Z for going backwards. The error value measures the image difference between the pattern window at the current frame 165, and the track’s pattern window at the original frame 149. We can do this by either scrubbing along the timeline, or a handy shortcut is actually clicking on the keyframe window up here. These windows become a lot more important when we look at our keyframe based tracking workflow later on. The second interesting thing is this keyframe window up here. The CameraTracker lacks a lot of functionality (if there's a way to extrapolate a 2D track from a 3D point, I can't figure out how to do it) and tends to get confused really easily. With Mocha Pro 2021, a new feature is introduced: PowerMesh sub-planar warp tracking. It’s very important to note that most of these buttons are bound to shortcut keys on the keyboard. Great for making limited selections on 3D CG environments. If we go here, you can see the track is way off. If I select one, it selects it in the Viewer, and if I select it in the Viewer, it selects it in the Tracks panel. The nice thing about using the center viewer option is we get to see the rest of the picture as well as the stabilize tracks. But closer to our original frame at 149, it’s more green. Even though this is red, it does not necessarily mean the track has failed or there’s a problem, it just means this is the highest error value we have seen so far for this track. Another way to get the same stabilize effect is to use this center viewer button here. The buttons with the typical playhead arrows allow us to track to the beginning or the end of the shot. I am just going to expand the search window at this point, and it has kicked off a re-track between those keyframes. One of the main reasons that tracking fails is because the search window is not wide enough to capture the movement between frames. For the moment, let’s simplify things and let’s clear all of these tracks and start from the beginning. Now, for this trickier example I am going to try and track the tattoo on the girl’s arm. I don’t need to be particularly accurate, as I am only going to garbage matte out the people. There are a couple of interesting things here in the Viewer when we add tracks: the first thing is this zoom window. Or we can create lots more of these. More Resources for Tracking Moving Objects in Nuke. Using keyframe tracking in Nuke 7+ can be useful in this circumstance. I am going to deal with this using a neat feature in the Tracker. Author: Puru Srivastava. However, I find the CameraTracker does not work if it is a link, so I will turn this into keyframes: Edit > Generate > Generate Keys from 1 to 60. 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. I am just going to switch to a different pattern halfway through and then go back because again I only need a rough garbage matte throughout. Instantly, the red frames have turned green. Display metadata for the selected track item(s) ... For example, pressing the left arrow key (4) selects the next node to the left of the current node in the tree. Roman Belov most add Tracker ever correct the four points problems from Foundry on Vimeo get. 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