Questions tagged [tracking]

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

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29 views

Why don't my tracking markers stay in position?

This is my very first post here. After having used it a few times in the past, I recently started playing around with Blender again. At the moment I'm experimenting with Blender's camera tracking ...
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13 views

Trying to upload two images in sequence in movie clip editor but it only adds one and fills all frames. How do I fix this?

Ive done it before and its worked. Trying to set up a tracking scene so I can drop a model into the photo accurately. For some reason it has stoped working and only loads in one of the selected images,...
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32 views

Why does my 3d object move around even though I have good motion tracking

I've switched from native Blender motion tracking to using April Tools mentioned in CGMatter's video. This seems to be working really well. However, I have a 3D model of a porsche that is giving me ...
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1answer
56 views

Motion tracking always gives me error messages and acts unpredictably

I have done my research and know that a reason for this might be that I don't have eight good trackers. However, I do have at least eight trackers in every frame of the shot, and I still get the same ...
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2answers
446 views

Single track with bundle should be selected to define axis

I keep getting this error when I select a point and another one to set X or Y axis when tracking. I DO have my camera solved I tried a few tutorials and I don't think I'm missing any step, yet I can't ...
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2answers
63 views

Camera tracking : solving floor plane when the floor is not flat

How would you go about adding a floor plane of a camera tracked shot with multiple tracks on the floor but the floor is not flat (like the unevened surface of a mountaine top or something) therefore ...
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2answers
37k views

How to rotate source video in Movie Clip Editor - Blender 2.68

After importing my footage in to the Movie Clip Editor, I find that it is not oriented the way I would like. What is the easiest way to rotate this in Blender?
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1answer
595 views

Export Track Markers to csv

I am trying to export markers from the Blender motion tracker and found the following script that will do exactly that: ...
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1answer
32 views

Distance points between frames in motion tracking

I am learning how to track points in Blender and was wondering if it is possible to get the distance a point travels when tracking points. Blender shows a line with 'knots in each frame to show its ...
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23 views

Camera and lens settings/preset for iPhone 11 Pro [duplicate]

I've recorded some footage using my iPhone 11 Pro that I want to track. Using Google I found that the primary lens (the one I used) has a focal length of 26 mm. However, I understand that for proper ...
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1answer
147 views

How can i make the track to constraint track on x axis using location transformation instead of rotation?

When i move my bone that i assigned to the eyes of my character using track to constraint they will track up and down but only will track side to side when i rotate the bone. is there any way to make ...
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1answer
505 views

Exporting camera tracking markers from Blender

I am trying to use blender to do some matchmoving and then export the camera along with the tracking markers for use in other software. After getting a successfull track, I have created a vertex cloud ...
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1answer
25 views

How do I make multiple things in the background the “ground and have them as ”shadow catchers" [closed]

I am building a scene with multiple planes in the background because I want to have the multiple planes working as shadow catchers except, when I put them in the background, they don't behave as ...
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2answers
382 views

Using sensor data as alternative for Motion tracking

I am not really sure, if am right here, but maybe you can help me out. I am curious to know if there is a way, e.g. a smartphone app which tracks various sensor data while filming, so one can use them ...
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1answer
42 views

3D objects in tracker scene slide off position

I have a video footage shot on an iPhone 8, that I want to track and use in Blender (to add objects etc.). I added a couple markers and these track pretty well, I can get a fairly low solve error (...
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1answer
19 views

How to mask out a object in motion tracked shot to put people behind things?

I want to put the girl behind the cup. How can i mask the foot of the girl? This is a motion tracked shot that moves so it doesn't just stay still.
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1answer
34 views

Prefetch maxing out 20+GB of RAM over a 355MB jpeg sequence

Pretty new to Blender - I'm having difficulty wrapping my head around how Blender caches image sequences. I have a 355MB jpeg sequence which I am trying to Prefetch and do a camera track on. Somehow ...
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1answer
415 views

Follow crop an object in VSE

Since i am a noob video shooter, i'm require to edit those video to "highlight" the person that i actually want to record (the person is too small compare to the image) to do that, i should do a ...
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1answer
23 views

How can I set the camera parameters for 3d motion tracking footage?

I am trying to 3d motion track a scene from my Sony HDR-HC7e Camcorder. I know that he has a 1/2.9" ClearVid CMOS sensor in it but how do I get the horizontal sensor Size? and should I youse the ...
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1answer
176 views

how to track rotation?

I am in was working on a project to track a boot model to live-action footage however when I try to track the rotation it is not accurate and it wobbles all around the place. one idea I had to track ...
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1answer
40 views

How to put rotation- and scale invariant labels to three dimensional objects (motion-tracked insert effect)?

I'm looking for an approach to introduce some informational objects to a 3D scene to be rendered. The effect is similar to motion-tracked inserts, you may know from various video productions. It would ...
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0answers
14 views

Motion Tracking issues

I followed a CG matter tutorial for mocap and am having trouble making the results look good and natural. The cube doesn't fully follow the motion. Any help would be appreciated. Tutorial Blend File
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1answer
1k views

How to see bundles and back projecting points of different colors?

According to the wiki: Bundles makes sense after solving the movie clip, and it works in the following way: the solved position of each track gets projected back to the movie clip and displayed ...
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12 views

I'm getting a distortioned weird effect when ''Setting up the tracking scene'' in my movie clip editor [duplicate]

Whenever I look into my 3d viewport through my camera I see this weird effects, how do I get rid of them? My resolution matches the footage's
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30 views

Camera tracking scene misalignment during animation render

I am using camera tracking in Blender 2.8 to composite some bouncing balls onto a video background. I need the balls to disappear behind an object in the video (a plant), so I have created a second ...
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15 views

texture is fine in the material preview but is purple in the render mode

I was using April tools for tracking but the texture which I was thinking to extract by baking became purple but is fine in the material preview this problem is not there in eevee
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1answer
234 views

Game Engine - Steering Behaviour Understanding

I am working on a BGE Horror Game right now and I want the enemy to follow the player around, but not directly. I want it to also walk around radon parts of the map even when the player is not there. ...
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34 views

Boujou Tracking - FOV feels wrong

For the past few years, I've been tracking shots from Boujou to Blender, using Blender 2.49B to 2.9 (Thats one of the best, non-bugged ways to transfer tracks). Though, shots like this where the "...
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24 views

3d Camera Tilting when Camera Tracked [duplicate]

I tried to 3d camera track my footage in blender and my solve error was 1.1846 and I didn't think that was that bad. I set the lens to 14mm because that was the lens I was using with my Panasonic g7, ...
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1answer
213 views

Cannot move Planar Track bounding box points

When setting up the Plane Tracker in the Movie Clip Editor to fit the replacement image into the background target, I cannot move the plane geometry vertex points to the location points on the bg ...
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1answer
23 views

Image Stretching as result of 3d tracking

When I do a camera track and set up a tracking scene, stretching appears in the image in the compostitor. Why? Also, an "Unsistortion" node has appeared in the compositor making the ...
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1answer
68 views

Portrait Video Camera Tracking shift

is it possible to track the vertical (portrait) video ? (I tried every step I did to Normal Landscape Video format) The solve error is 0.2 (looks good) , but after creating the scene , all track ...
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1answer
577 views

Help with determining camera specs? Blender Motion Tracking

I have some experience working with Blender's motion tracking capabilities, but have only used cell phone video that happened to be presets in the camera specs dropdown in Blender. I am trying to do ...
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2answers
22k views

How can I get better results when doing camera motion tracking?

Whenever I do camera tracking in Blender the reconstruction is always zooming out or not on the axis. I have a great quality camera, but the end results of the camera tracking always has the model ...
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1answer
36 views

Motion track while knowing distance between points

Is there a way to 3D track points while knowing the distance between them? Example: I track nine points in a grid like this: . . . . . . . . . The distance between ...
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1answer
55 views

How to solve camera for only part of footage?

I'm pretty new in camera tracking and Blender (2.80). I have a "long"(1 minute) dash cam footage of driving on the road, where most trackers stay visible only for a second or less, so a lot ...
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1answer
92 views

Motion tracking : setting parameter for multiple selected trackers

I have 20 trackers which need to be re-tracked and i want to change the method from 'loc' to 'Affine'. But how to set this for all the trackers at once ? i can select multiple trackers but the ...
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0answers
26 views

Blender 2.8+ Camera Tracking with variable Focal Length (zooming)?

I've seen on a couple forums that camera tracking with variable focal length used to be planned for blender all the way back in 2013 (for example here). Though all links I've found linking to the ...
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0answers
11 views

Bad motion tracking [duplicate]

I did camera tracking in Blender. The track was very bad despite a solve error of 0.4. The object slid back and forth slightly the whole time. I also set everything correctly (FPS, camera ...
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1answer
611 views

Problem: Linking empty to track places all empties at origin and won't move

I have created a Scratch animation which was then recorded and tracked. The tracking is successful but I cannot reconstruct it in the 3D environment. Whenever I select one empty or multiple and try ...
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1answer
49 views

How can I move tracking markers along the timeline?

To explain the problem I have run into: I have created some tracking markers in the Movie Clip Editor and tracked several points in the clip, and I have added an offset to the movie clip so that it ...
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1answer
74 views

motion tracking : How to apply lens distortion value from one clip to another?

I tried to track a distorted clip using motion tracker. I already determined the distortion value K1,K2 using a reference grid. Now I need to apply this distortion value to other clip. How can I do ...
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1answer
889 views

Camera tracking data import

Is there a way to import camera tracking data, like .json or .jsx files into Blender?
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3answers
5k views

How to export a motion tracked camera to 3ds Max?

I have motion tracked my camera in Blender and have been trying to import it into 3d max. When I export it as an .fbx, the camera, when I import it into Max, is facing the opposite direction to what ...
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2answers
98 views

Tracking; How to deal with tracked features that disappear and become visible again later? [duplicate]

I'm tracking a box in a video by tracking dots on each side, and at certain points in the animation a side of the box disappears, and then later on that side is visible again. As a result, the dots ...
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1answer
324 views

Shadow Catcher, Shadow Rendering Behind Tracked Camera Scene

I asked a question before but I think the problem has changed enough to ask it in a new way. I tracked some footage using the setup tracking scene button, and had issues with the rendering. I ...
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0answers
14 views

How to choose follow path to track camera in blender 2.83?

In previous blender 2.8 to track camera youll have to parenth camera with circle, then to select camera and circle, ctrl+p then follow path.In blender 2.83 after ctrl+p there is no option follow path, ...
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1answer
57 views

Why isn't the perspective/focal length correct in this camera track?

I'm attempting to use camera tracking on two similar photos to determine focal length and orientation and, subsequently, to reconstruct the scene with geometry. I've tracked all points manually, since ...
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1answer
54 views

Why did my tracks disappear?

I shift-clicked the X, you know the one next to the F for saving a data block; did I just erase all the info from the solve? I thought the tracking info was linked to the Camera, not the video clip? ...
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1answer
430 views

why i cant see tracking markers in 3d viewport

I have just finished tracking and camera solving my footage. after setting up tracking scene, the markers are visible in the 3d viewport but only in the motion tracking panel. but when i switch into ...

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