Blender Stack Exchange
Blender Stack Exchange

Questions tagged [tracking]

Questions about Blender's 3D motion or object tracking system. Object tracking is accessed via the Movie Clip Editor.

Motion Tracking is used to track the motion of objects and/or a camera and, through the constraints, to apply this tracking data to 3D objects (or just one), which have either been created in Blender or imported into the application.

Motion tracking at the Blender Manual

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How to determine lens undistortion values for motion tracking?

In the camera setting in motion tracking, how do I tweak the K1, K2 and K3 value properly. I was told that these values are not necessary to tweak but I do want to adjust it, just for the sake of perfection.
krismath
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Motion Tracking. What do the graphs represent and how are they useful?

After tracking things on a video clip or image sequence, I get a graph with green, red and sometimes blue lines. What do those lines represent, and how are they useful to get more accurate tracking or a better camera solution?
user1853
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Motion tracking round objects

I'm kind of new to motion tracking, and I need some help. I'm trying to replace the face on some footage of a LEGO minifigure. (You can see the footage in the GIF below): So, I added tracking markers to the eyes and mouth of my minifigure, and…
rioforce
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Remove Tracking Markers

I have some footage I am testing out the motion tracker with, and the footage looks like to this: As you can see, I have added many tracking markers to the head of the minifigure. I have added a new face onto the head, but unfortunately, I do not…
rioforce
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Do failed tracking markers still contribute to the solution?

Does Blender solve the camera only for markers which are able to track the entire scene? For example, I have a complicated shot with a huge camera movement. The camera moves forward, leaving some markers behind causing some of them to fail by the…
Director78787
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Can a mask stick to a shape in the motion tracker?

I have some video footage of a flat surface (for this example, let's say it's a binder or a book), and I want to digitally replace the cover of the book using a plane in Blender. So, I set up my tracking scene and align the plane and stuff and it…
rioforce
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My markers in the movie clip editor keep "moving" around - what gives?

I'm trying to add motion tracks to a video I've imported. Here is what I have done so far: Open a clip in the movie clip editor. Click "Add Marker" and Ctrl + to place a marker. Press Alt + → to track the selected marker forward one frame. On…
Nathan Osman
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When should I use different tracker motion models when motion tracking?

I'm trying to get into motion tracking but don't know when to use different tracker motion models, or if it makes a difference in the outcome of the track. Could someone please explain, or link me to a video explaining, when to use each model?
Stacks
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Track stereo footage

I have 2 footages. One for the left eye, and one for the right eye. Is there any way to track the cameras from these footages and get the stereo camera from it? Or get 2 separate cameras from it, but at the same position if it was stereo camera? I…
Ivan Lebedev
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How Reconstruction tools works?

i have this scene tracked. The "camera solve error" appear to be not bad (0.5). My question is: How the "reconstruction tools" works? To set the FLOOR it ask only two trackers when normally we need minimum 3 points to have a plane. To set an AXIS it…
SottoZen
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camera track - was good, but breaks after editing an object

First, I'm a newb to tracking. That said, I tracked my scene with a .3 solve rate. I dropped in a cube and rendered out a short animation... looked great. I readjusted the position of my cube... nothing more... and now my track is broken. All…
Mike Mitrovich
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How do I reduce the sensitivity of the SURF feature detector?

I am using libmv, Blender's structure from motion library. The SURF feature detector is running a little wild on me, detecting over 7000 feature points on a relatively small image. I would like to reduce this sensitivity by providing a threshold of…
user20185
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still frame camera solve

I've found a number of how-tos for solving video but I'm just looking to put an element in a photo and can't seem to find a how-to for that. Is it possible in blender to do a camera solve with a still image? Thanks.
geoff swartz
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How does blender calculate the solve error in camera tracking?

Just curious, how or what algorithm does blender use to calculate the solve error in camera tracking. A quantitative explanation would be great.
krismath
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Correct tracked camera orientation

I have been playing around with camera tracking and I'm happy enough with the tracking and alignment of the markers with the footage when viewed through the camera. The problem is, when I am not looking through the camera I can see that the grid…
Neil
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