# Tracts group mask **URL:** \ **Category:** Uncategorized\ **Created:** [June 14, 2016, 9:54am UTC](https://community.mrtrix.org/t/tracts-group-mask/297 "2016-06-14T09:54:48Z")\ **Posts on this page:** 1\ **Showing post:** 6
**Author:** ![jdtournier](https://community.mrtrix.org/user_avatar/community.mrtrix.org/jdtournier/32/2594_2.png) [@jdtournier](https://community.mrtrix.org/u/jdtournier)\ **Post date:** [June 16, 2016, 12:33pm UTC](https://community.mrtrix.org/t/tracts-group-mask/297/6 "2016-06-16T12:33:33Z")
That depends on exactly what you’re trying to do, but assuming you’re trying to measure e.g. FA along/within tracts, you should take a look at [tcksample](http://mrtrix.readthedocs.io/en/latest/reference/commands_list.html#tcksample) and [tckresample](http://mrtrix.readthedocs.io/en/latest/reference/commands_list.html#tckresample). There used to be an option to allow the sample positions to be defined in template space, but things have changed a bit as of [today’s version update](https://community.mrtrix.org/t/mrtrix3-version-incremented-to-0-3-15/300/1), so I’m not sure what the process is now. @rsmith should be able to fill in the gaps… --- _[View the full topic](https://community.mrtrix.org/t/tracts-group-mask/297)._