3D tracking with nuke is a very straightforward process that is used for a lot of techniques like 3D projection, create clean patches of a plate after use it to integrate other models/textures.
Here you can see the original plate that I choose for this practice. I like it because it was an alley with some movement on the back that later can be removed or something. Also, it has a post that passes through right in front of the camera and it would be a good practice to remove it. At least the one thing I’m gonna need to do is rotoscope it out to be able to create patches behind it.
After we denoised the plate and made the right adjustments like some sharpening or grading to make it easier to track, we can proceed to do the track.
As you can see I do some treating before the track, and roto out some areas that could cause some problems.
This is the part the I did the roto were the tracker wont affect.
Then is just a manner of selecting some points and create cards or 3d objects to see that the track is working and also to later work on that to replace it with a patch. Here you can see how the track work. Later on it will be improved and you will see the result at the end.
As you can see in the previous images, we have the roto of the post that I’m putting back on top with a merge node so it passes in front of anything I create behind him. And I also show you the solve of the track, where the purple points selected are the ones that I’m setting as ground points so it knows where the ground is, this will help places patches or anything.
Here I create some patches on the background removing the people to have a clean plate without anyone on it.
The image on the right are the patches to remove the people and the ones on the left are what’s the next step that I’m working on it, remove the close up post that is passing in front of everything with different projections. Here is the end result that I have now.