Hi Antonin,
Not sure if you have seen this thread. This will allow you to crop the template tractogram to show only streamline segments associated with significant fixels. This can be useful for visualising results in 3d.
If you wanted to see the entire streamlines that extend from the significant fixels, we don’t currently have an easy way to do this. @rsmith it might good to modify tckedit in the future to allow streamline selection with fixel data.
Cheers,
Dave