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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13 views

How do I append camera with camera track animation

I want to append the camera that had animation on it (because of a 3D camera track) to a fresh 3D scene. How do I do this? When I append the camera into the new scene, it has no animation.
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21 views

remove unwanted colorseams on masked region in planetrack

I mostly find solutions to my little blender problems by watching videos and reading tutorials. This time, I don't get it, so, hopefully someone can give me some hints on how to solve my problem: I ...
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20 views

Determination the K-parameters for the distortion automatically

Something similar was ask here but I would like to know if it is possible to know with Blender automatically the distortion parameters? I have this picture and I would like to know if Blender can ...
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15 views

Do I have to move a tracking dot for each frame?

I have recently started using Blenders Motion Tracking. Sometimes one tracking dot is in the incorrect position for many frames, even though the camera doesn't move at that point. Do I need to move it ...
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10 views

Camera solve on video game footage has wrong focal length (solve error 0.82 px)

When I solve camera motion in my video game footage, blender makes the camera's focal length and location wrong, but the solve error is 0.82 px, I do not know how to fix this and tried changing ...
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5 views

Tracking camera motion of a top down shot footage [duplicate]

I've tried multiple times but didn't get any satisfactory results. Is it because I had tracking points on the ground only i.e. only on one plane. Can someone explain what might be the reason
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26 views

3d object created from motion trackers is rotating the opposite direction; how to correct?

It's my first attempt to use motion tracking and the VSE in Blender; I decided to use a clip from a movie to mess around with and try to get the hang of it. I think I am getting very close to ...
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42 views

CGMatter Facial motion capture tutorial - script error

I am working on the facial animation following the cgmatters tutorial: https://youtu.be/uNK8S19OSmA Everything works fine except script from the end of the video. I have more than 200 trackers so im ...
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34 views

Camera solve in Blender: are empties supposed to be stationary in 3d-view?

I have a 15 seconds long recording where the camera moves up and down, and comes closer to, and further from, the object being filmed. I have taken care to include easily tracked markers in the frame. ...
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21 views

How do I attach an object to specific trackers?

I have been sitting and trying to solve these problems for ~6 hours, but to no avail. I tracked my image sequence with the default Detect Features button and added my own trackers, but object in my ...
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10 views

Using camera animation as base for motion tracking solve

I'm wondering if it's possible to use a camera animation (FBX or alembic) as the starting point for the motion tracking solve in Blender? I'm using a method of tracking a camera live but the data it ...
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15 views

why can't blender solve camera motion if the footage is shot on android?

I shot footage on my Lg android device and blender is saying that there are most likely no good key frames. what do I do?
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Can you set a motion tracker as an empty? [duplicate]

I'm trying to make an object follow a path from a recording, and I'd like to do it with the motion tracker. I'm not trying to solve camera motion, just the object. I've got a tracker in the motion ...
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14 views

Tracking Issues

I've just started getting into camera tracking and ran into several issues. After detecting features, automatically laying more than 8 trackers, manually trimming and refining the focal length, I ...
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7 views

How can I camera track this scene better? [duplicate]

I have spent a while trying to track this shot. I am very new to blender camera tracking, though. Even though most of my trackers are doing a good job of staying on target, I am still getting large ...
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8 views

Detect and Track Features from Frame 1 using Python [duplicate]

I am trying to detect and track markers in a clip, from the first frame forwards. I am using bpy.data.scenes["Scene"].frame_current = 1 to set the clip to ...
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16 views

Why does Blender's tracker keep changing my focal length?

I've been trying to track a shot in Blender that I'm adding VFX to. The footage was shot on a 35mm lens on a tripod with a loose head. Because the shot only moves a small amount, the track points are ...
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12 views

No shaders or lighting appearing in render view after camera tracking

Finally got done tracking my camera, but now I can't get any of the objects in my scene to take on shader properties. I've Tried changing the shader settings on the object and adding a light right ...
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10 views

Tracking Szene not matching tracked video

Very low tracking error, focal length is matching, ... I used Set as Background and Setup Tracking Scene to create the scene. Empties from the trackers move right but don't match the video in position....
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11 views

Reprojected Tracking Points are way of

My blend file: https://drive.google.com/file/d/1mG5tCoFMPHcWtXTJOfIQ25bgo0iGlGHR/view?usp=sharing (It should also have the vid included) I got a Solve Error of 0.96 which is not great but its at least ...
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13 views

Way to high Solve Error or it is not accurate with the refined trackers

Blend file I tracked the thing and I do not think, that I tracked it so badly that the solve error should be 255.86. And before I wanted to change some things I had a Solve Error of about 1.03 but in ...
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10 views

Frames Shown in Movie Editor>Mask Mode does not Match Frames Shown in Compositor

I've been tracking some footage for a project, and wanted to mask out some of the tracking markers I placed in the area I filmed. The first tracking marker worked fine in regard to masking, but for ...
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18 views

What I should put on Sensor Width when I tracking the Camera?

I am tracking the camera on a scene but I don't know which is the Sensor Width. I recorded the scene with a Xiaomi Redmi Note 9 Pro, but when I search about cellphone's sensor width; it give that the ...
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21 views

Which keyframes A and B should I pick when tracking a circular motion?

I'm trying to track a videoclip where the camera moves around an object M in a circular motion. I added a picture to make it clear what I mean. Since the camera is constantly turning, and tracking ...
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5 views

Issue with parenting tracked nulls to get Orientation for mesh

I am currently trying to figure out how to get the data that has been tracked from a footage. I need to track an arm in order to get the movement and replace it with a mesh (that has no hand). After ...
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50 views

How to get the updated rotation of an object during soft body physics simulation?

I am trying to get the updated rotation of an object during simulation in Blender 2.92. However, I am not able to get what I want. I appreciate if someone can help me with this. As you may know, you ...
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115 views

Which 3 points are best to get a good floor? (Motion tracking)

When I set the floor of my tracking scene, I have to select 3 points to use. However, I noticed that the orientation changes depending on which 3 points I pick. I always thought it didn't matter. But ...
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103 views

What is the sensor width of an iPhone 11? I need it for motion tracking [closed]

I recently filmed a video with the iPhone 11 and I'm having trouble finding the sensor width needed for motion tracking. I have found online it uses a 1/2.55 sensor width which blender actually offers ...
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21 views

Export tracking markers - Python

I'm trying to create mesh on tracking markers with python by this code: Exporting camera tracking markers from Blender However I'm still getting error: Line 19, in execute TypeError: Element-wise ...
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17 views

Why is my background video in the animation panel slowed down/lower frame rate than in the motion tracking panel?

So I added my image sequence into the motion tracking panel, it's 561 frames and looks good when I play it. When I set this video as the background and look at it through the camera in the animation ...
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21 views

Is it possible to keyframe the camera by hand instead of motion tracking?

I’ve been trying to track a complicated clip for a few days already but just can’t get it to track properly. Would it be possible to set the clip as the background and keyframe the camera by hand? ...
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55 views

2.92 Inverse Trackpad Movement?

I just installed 2.92 and it has inverted my trackpad movement in the viewport. Edit>Preferences>Navigation>Orbit & Pan There used to be a setting for 'Natural Trackpad Movement' it isn't ...
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15 views

Rotation stabilization resulting in weird effect

I'm using version 2.92 of Blender and recently started learning it with the help of tutorials. This is what led to my problem: I set up two track markers on an imported image sequence in the "...
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1answer
48 views

How do I separately apply color correction to a model and video clip?

So I'm making a scene where I put my model in a clip I tracked. I think the lighting looks good but the colors of the model itself look overexposed compared to the "flat" colors of the video ...
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24 views

Motion tracking rotation too small

After solving my video I see that the rotations are too small (I rotate panoramic in 180 degrees, and then back halfway again, but camera only rotates 90 degrees). Any tips on what can cause this? The ...
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1answer
87 views

Failed to solve the motion: most likely there are no good keyframes

I chose my camera tracking points, I locked them, but when I go to Solve Camera Motion, I received this message in red "Failed to solve the motion: most likely there are no good keyframes". ...
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18 views

Replace all 3d markers with 3d meshes

I have got a bunch of 3d trackers, and for the specific thing i am attempting to do, i would like them to all be replaced with planes that still follow along the tracked motion.
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26 views

Locked track Camera error [closed]

Locked track object to camera x axis is very strange When camera is on z axis(rotation) x axis of cube turn up Is python can change it?
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22 views

How to track footage that goes in a circular motion? [duplicate]

I've been trying to track the game footage in the link below I tried tracking everything myself, and the detect new features method when some tracks are starting to disappear, the lowest I got was a ...
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1answer
32 views

Car model does not render after using motion tracking, but its visible in viewport

I am fairly new to Blender.(I am an experienced Maya 3D artist) I'm using version 2.83 on an iMac. I have rendered simple 3D models before using blender and the Eevee engine. But I need to test motion ...
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1answer
46 views

When should I rotoscope in the compositting proces?

I already made my animation and I’m going to composite it in a videoclip. I’m currently tracking the clip, but there are going to be some occlusions in front of the animation that I need to rotoscope. ...
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30 views

Semi-AutoTracking

I want to automatically detect features track 40 frames detect new features track 40 frames and so on. I found this this addon but it does not work in 2.91.2 (I suppose my files are too heavy float ...
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13 views

Influence on Object Constraint and Visual Transform ruins earlier keyframes

So I have a camera parented to a null object following a path with the follow path constraint, which works fine. I want the camera to focus on an object at a given time and then after some time stop ...
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15 views

Camera tracking: Render only shows model, not background movie

So I've set up the nodes to composite the background video but during rendering the 3D model shows up and not the background. I've set film->transparent and done everything I could find. Can ...
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1answer
54 views

How to camera track complex shoots? [closed]

I am not able to this shoot https://youtu.be/PkEsl5c5nC4. The starting is good but then it diverges. These are my trackers and error is 0.41 this is my hold out material because I need the scene to ...
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1answer
88 views

Motion tracking: I have a solve. Now how to get the camera position for each video frame?

TLDR: I've solved camera motion for a video clip. How can I export each camera's position and rotation to "real", unconstrained camera objects? I'm using Blender's motiong tracking tools to ...
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24 views

Mask cables in footage and change its color

I have a charge cable in the footage which I want to track the cable and change its color, here is how the footage looks like from the very first frame to the last frame: The red point is where I want ...
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1answer
41 views

Camera solving - what algorithm is used?

Note: this question is about how Blender is implemented, not how it's used. IIUC, Blender uses 8 points (or more) at two keyframes to calculate the position in space of the camera. What is the ...
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1answer
44 views

Tracing object with rotation constraint

I tried making a gun turret that would be pointed at the empty , and that part works so far but the limit rotation does not work at all and the barrel goes up too high: The constraints are shown ...
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1answer
54 views

Physics in tracked scenes, not working

I've already made plenty of Blender physics simulations in my life but when i try physics in a camera tracked scene, literally nothing happens. Always. All setup is the same as in other scenes but ...

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