A value of 1 should produce reasonable results for most sequences. Let’s track backwards to the beginning of the shot using the Z key. If you scrub along the timeline, you can see that this track is much better all round, so keyframe tracking has really helped us out here. Now we are back with a good motion path with the five keyframes. Lastly, we'll create a tracked camera from the process which we can use for projections. I will just undo that, so you can see the old curve. Note:  Enabling black outside also adds a solid alpha covering the input image area if no alpha is present. Now, with this version, there is a new zoom window right here. Nuke – Tracker Node. Sets when the tracker attempts to grab a new pattern: • on first frame - grab a pattern on the first frame only. I will expand the interface because we have some other parameters that have been hidden because of the size of the interface. 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. This will track the keys either side of the keyframe you are on. Smooths the scale by averaging this many frames together. Note:  Tracking scale requires at least two tracks. 6. For the tracking itself, almost everything is the same. For example, if we want to track to the start or the end of the shot we can use the Z or V keys, or if we want to track backwards or forwards one frame we can use the X or C keys. I also always have the option to go back to any of my track buttons and reanalyze either part of the timeline or the entire timeline, and go forward or backward. Multiple suggestions found. • match-move - transforms another image so that it moves to match the tracked points. Now I would like to show you a new feature that allow us to combine tracking and roto together. Using expressions, you can apply the data directly to transform and match-move another element. Adjusts the y coordinates of the associated track anchor’s center. This will be covered in a later tutorial. In this case, I want to track all of them, so I will press go. We can then jump onto a later frame, for this example I’m going to use frame 128. Go back to the first frame, select the Read node and right mouse button click, select Transform > Tracker. When transform is set to stabilize or match-move, sets the frame in the input sequence to use as the reference or identity frame. What I will do is use the Tracker to allow me to roto around this greenscreen. For example, images with pixel intensity 40 may require a max-error value of 40. If you want to track something else, you must craft a new node. 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. … You see, the track is not quite on the circle of the tattoo, so move the Tracker to where it should be, let go, and allow it to re-track. One of the cool things is that you can export individual tracking features as “Usertracks” and use those as a 2D screenspace track. Displays the skew applied to the Transform widget on the y axis for the current track. The last guy is more problematic because he gets occluded. We head down to a bit further down this shot, create another keyframe, again to help the Tracker. Choose the tracking operation you want to perform. Alright, so I’m back and I have improved the motion path. 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. Here’s a nice feature of this system. In this tutorial, I have shown you the four main ways of diagnosing track quality: using the zoom window, the center viewer window, the Curve Editor, and the traffic light warning system (show error on track). • Rifman - remapped pixels receive some smoothing, plus significant sharpening (as shown by the negative -y portions of the curve). It looks like the relative position of that post and that handrail don’t really change between keyframes. In short - track the marker and match-move a roto (Paint) to it. Thanks for watching. This is the Error Curve for our track. I can scale this by click+dragging the ends. This is actually really important when we are tracking. In this example, I would like to track the girl’s nose. 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. You are imparting new information into the system, which gives you a better overall track. The thing to note about this Error Curve, which is typical of most Error Curves, is it starts off at around zero and gradually increases as the track goes on. You can see that if I go to the first frame of the timeline, right here where 0,0 is, what I can do though is line it up with where the center of the motion path is by adding 1 more Transform node. Rather, they indicate that the pattern has changed considerably since the previous pattern grab. Nuke: Tracker Marker Removal (Paint Node) from Fredrik Mannerfelt. • stabilize 1pt - similar to stabilize, but designed for use with a single track. This is an extreme example to show that high motion needs large search areas. This will not affect your course history, your reports, or your certificates of completion for this course. In this comprehensive course, digital compositing pioneer and Nuke authority Steve Wright introduces this complex and powerful tool to visual effects artists new to Nuke. Hope you enjoyed this, thanks for watching. For example, if you set the shutter value to 1 and your current frame is 30, the shutter stays open from frame 29 to 30. • custom - open the shutter at the time you specify. Nuke’s node graph and resolution-independent processing mean the scope of work you can handle is unmatched. Let’s say that I also rushed the placement on my last keyframe, it’s going to recalculate automatically because I moved that box for that frame. Associated with that is the anchor box for track 1 in the Viewer. Here I have six tracks. This only gives us part of the picture. The integrated Camera Tracker in NukeX® and Nuke Studio replicates the motion of a 2D camera with an animated 3D camera or point cloud in Nuke's 3D space, allowing you to composite 2D/3D elements accurately with reference to the original camera used for the shot. Also if we select multiple tracks, we get to see the average, the stabilized average of both of these tracks. Use up and down keys to navigate. Nuke's 2D Tracker is a very powerful tool. This renders as black pixels outside the image boundary, making it easier to layer the element over another. Now click Track Features. 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. We can verify this by quickly increasing the keyframe size. You can see we chopped that mountain of error in half. Develop in-demand skills with access to thousands of expert-led courses on business, tech and creative topics. For the Transform node they may use 1 (translation only), 2, or N points to find the final transformation, however … You can use the Curve Editor to spot problems in the tracks by looking at the Error Curves. Back in Nuke 7.0, I bring up the new Tracker. You can see now that the toe has been correctly found in the next frame. Now, I just need something to match-move. One of the advantages of this Tracker is that it lets us have as many tracks as we like. In most cases, you should keep black outside checked. Where the other two trackers stopped, you can see at the bottom of the screen, these two parts of the Roto have also stopped. If we zoom into the bottom left hand corner of the search radical, we can see this magic error value here. So, moving down now I have a keyframe quite close to the other ones, so just go to the top and remove the keyframe. To delete all of these tracks, we need to first select them. In the Shape tab, set… To do this, we can use keyframe tracks. And sure enough, as the bar comes through the shot, the track bombs out completely. I will start off with an auto-track and see how far that goes. Useful Nukepedia Tools #11 W_hotbox by Wouter Gilsing. 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. When you work in stereo in Nuke 7.0, you have this new stereo offset parameter, and I can split it open and offset the Roto to where it should be in the left view. Notes are saved with you account but can also be exported as plain text, MS Word, PDF, Google Doc, or Evernote. So let’s see how we would approach this with keyframe tracking, so bring up the Tracker as normal. I will also turn on the center viewer button. Translate is fastest, but may lose the track if the pattern rotates, scales, or shears over the course of the track: • Translate - only expect pattern translation. If you don’t see a resolution you like, you can always make a brand new one - just click the new button and enter a new name, and a new size. When enabled, auto-tracking deletes manual keyframes. Now this is a stereo image, but the Tracker has only tracked one eye. Zoom in and move the Tracker to the top circle of the tattoo, and then adjust the pattern window, so it captures most of the top of the tattoo. • Lanczos4, Lanczos6, and Sinc4 - remapped pixels receive sharpening which can be useful for scaling down. This places a track in the center of the Viewer. You started this assessment previously and didn't complete it. If we go back a few frames and move the Tracker to create a new keyframe, you can see a new window appears. 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. Once tracking is complete, you can drag-and-drop the rotate information to link other nodes, such as the Stabilize node. Once it’s done, you can play it back and see how well the track follows the pattern. Back to our dancers, I would like to show you a couple of other new features that are in the new Tracker. So I thought I’d share it here, as Im sure others will find it useful. You can click on those patches to compare them. To do the tracking, we use these controls up in the toolbar here. FaceTracker is a plugin node for Foundry Nuke created for facial tracking without mocap rigs and markers. Looking at the zoom window for these two peaks here, you can see the track is a little bit off, but I’m not too concerned about that at the moment. A common use for the 2D tracker is to pass on tracked information to the CornerPin node. So I am expecting this track to jump a bit. New platform. I will use the Shift key to start a track. GeoTracker is a plugin for Foundry Nuke that can be used for tracking rigid and deformable 3D models without the usual hassle associated with match-moving job. Range: Global is the range of Project Settings Use Custom if you don’t want to track the entire range. CAUSE. Having a larger pattern window size increases the stability of the track. The baked options do not use expression links between Tracker and the exported node: • CornerPin2D (use current frame) - creates an expression linked CornerPin2D node that warps the image according to the relative transform, using the current frame as a reference. Then, we'll track the camera and attempt to make some improvements on the track by using the filters and deleting bad tracks. It can mean there was a good track, but it found the pattern to be different but still got the track correct. So, I have created four keyframes on my first track, first track done. When enabled, Tracker re-grabs a pattern when a track is manually adjusted. Author Steve Wright covers the introduction of 3D particles, the enhanced spline and grid warping, the all-new planar tracker, an audio scratch track for matching audio cues to effects, and a briefing on … Click the set keyframe button, which adds a keyframe at frame 101. Sets the filter applied before image patches are compared: • adjust contrast - the default filter, stretches the image contrast to better suit the tracking algorithm. • custom - use the every n frames and when error <> controls to specify grab behavior. Useful Nukepedia Tools #12 Channel Hotbox by Falk Hofmann. I will zoom in here so I can see this better, and position that until it lines up right there in the center. 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 Foundry Visionmongers Limited is registered in England and Wales. You can see the track has completely failed. We can scrub quickly across the Timeline by dragging this vertical yellow bar. Sets the node to output when you click create. Useful Nukepedia Tools #10 To Do List by Frank Rueter. GeoTracker makes tracking tasks much easier, so what usually have been done by a team of motion tracking specialists can be done by one of them and with less time. If we look at the zoom window, we can see the track does not exactly follow the tip of the nose properly. Once I have a few keyframes, I can then analyze. You can see now that those points of the roto have been linked. The tracks selected are the ones that will be tracked when I click on track forward or track backward. For instance, on frame 199, click+drag it and it actually updates the surrounding keyframes. Instead, I will use the Viewer to see if they are any good or not. You’ll also learn that the tracker doesn’t only retrieve position data but also rotation and scale data. These windows become a lot more important when we look at our keyframe based tracking workflow later on. It’s the Show Error on Track button. • Impulse - remapped pixels carry their original values. We would start off in exactly the same way as we would with normal tracking. Another way to get the same stabilize effect is to use this center viewer button here. So, I will go full screen and we will work in this mode. Once I had that, it was only a small tweak to have it to also create a Nuke “Tracker” node (credit to Mat Power for doing a lot of this side of the coding). 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. In this comprehensive course, digital compositing pioneer and Nuke authority Steve Wright introduces this complex and powerful tool to visual effects artists new to Nuke. Set this control to 0 to always display selected tracks with keyframes. 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. The curves of a simple animation can be created using a small number of keyframes in the Curve Editor. Click to select all tracks in the Tracks list. In our panel, we now have four trackers. Because a lot of things have changed, we are going to go back to basics on creating new tracks and setting up everything you need to get a good track. Instead, you have complete control over your alpha channel (and any other channels) just as you do your red, green, and blue. If you look at the zoom window, you can see it’s pretty much in the right spot. You will also notice these two boxes up here at the top. You can see we now have a pair of keyframes. Because I have placed my track 1 box on the first frame already, I get the first keyframe for free - I will see the blue dash right here. In this tutorial, we’ll take a look at tracking footage using the 3D “Camera Tracker” node. Then, we'll track the camera and attempt to make some improvements on the track by using the filters and deleting bad tracks. Useful Nukepedia Tools #11 W_hotbox by Wouter Gilsing. Tracker Setup. I will go ahead and hook that up. We can see at the right at frame 149 that part of the ear is occluded, and then uncovered here at frame 165. 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. One of the cool things is that you can export individual tracking features as “Usertracks” and use those as a 2D screenspace track. It has completely drifted. True enough we can see that the two patches are fairly different. Adjusts the x coordinates of the associated track anchor’s center. 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. 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. GeoTracker makes tracking tasks much easier, so what usually have been done by a team of motion tracking specialists can be done by one of them and with less time. Type in the entry box, then click Enter to save your note. 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. This allows us to get a good picture of where the track currently is in the frame, and also to position it. I will put him into his own group, and then I will select Link to > Tracker 1 > the first track. NUKE 7.0 - Combined trackers from Foundry on Vimeo. If you don't know the camera info, make sure you set lens to unknown and free move. If we hold Shift and drag, we can magnify this zoom window even further and really get a much finer position. I have wasted so much time on this stupid tracker node that barely works in … Each of these allows us to say what frames we would like to track. So, there’s a quick introduction to the new Tracker in Nuke. Now you can see tracks within my CameraTracker, but these don’t always remain, so I’m going to use a User Track to isolate this point. To delete, just select the patch and press the Delete Key button. If we scrub along, you can see instantly how the track is doing. Foundry has released Nuke 12.1, the latest version of node-based compositing software, revamping the Shuffle node, and making it possible to use companion tool HieroPlayer as a flipbook viewer.. NukeX, the extended edition of the software, gets a new Blink-based particle node, more intuitive lens distortion workflow, and updates to the Grid Warp Tracker and Cara VR tools. • every n frames - use the every n frames control to specify the frame interval. Sets when the zoom window is visible in the Viewer: • always - the zoom window is always visible. ... Navigate around the node tree in the direction specified. Sets the order in which skew transforms are applied: Sets the center of rotation and scaling. 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. If you set this to something other than all or none, you can use the checkboxes on the right to select individual channels. Useful for remapping arbitrary animation … Values are in frames, so -0.5 would open the shutter half a frame before the current frame. What I need to do is to be able to turn off tracks 1 and 2 as the greenscreen leaves the bottom of the frame. I will click the add track button; the track listed here is track 1. You can turn off the “calculating preview” popup if you wish. This is where the node goes if it has a hard time finding the pattern. 3D Camera Tracker. You want to mask out the people, so go to Mask > Mask Alpha. So I will bring up a Roto now, and just do a quick garbage around the first guy. Let’s move it over to our first peak. If we scrub on one frame, you can see the toe is now completely outside the search window. What we want to do is get a better idea of how the track is doing over time, where it’s drifting, and by how much. In short - track the marker and match-move a roto (Paint) to it. Or you can invert the values of the data and apply them to the original element - again through expressions - to stabilize the image. We have a nasty shot here - there is a lot of movement and it also looks like there’s some rolling shutter and there are two bars that wipe all the way through the whole of the shot. Instantly, the red frames have turned green. Thank you for taking the time to let us know what you think of our site. So, good frame, problem frame, problem frame, and good frame. This is a 2D tracker that allows you to extract animation data from the position, rotation, and size of an image. In this tutorial you’ll learn how to use Nuke’s Tracker and Rotopaint nodes. Again, this has been re-designed for Nuke 7. The tracking information can be later used for retouching, adding scars, relighting, face replacement, aging and de-aging, etc. Start your free month on LinkedIn Learning, which now features 100% of Lynda.com courses. So, you can see if we skip on one frame that our original pattern is contained nicely within the search window here. Displays the translation applied to the Transform widget for the current track. You might think that there would be some overlap between the tools in Nuke and Mocha Pro. We can do this by either dragging and selecting them all in the Viewer, or pressing Ctrl/Cmd+A or pressing the select all button here. The area that was red has now turned green, but this has flagged up a new red area. Sets the size of keyframe snapshots in the Viewer. NUKE 7.0 - 2D Tracker - Keyframe Tracking from Foundry on Vimeo. If we go out here, and make the search window massive like this, we can try to re-track now. 14th Oct 2018 by finleysearlepenwithdigital. Stefan first steps through all the setting you need to know for the camera tracker node. bm_CurveRemapper. If you have seen Dan’s tutorials on the Tracker, then you will have a good idea of the new interface.

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