These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 0.98 s (backtrack: 0/20).

[ebuild  N     ] acct-group/gnump3d-0-r2::gentoo  0 KiB
[ebuild  N     ] acct-user/gnump3d-0-r2::gentoo  0 KiB
[ebuild  N     ] media-sound/gnump3d-3.0-r6::gentoo  USE="-sox -test" PERL_FEATURES="ithreads (-debug) -quadmath" 619 KiB

Total: 3 packages (3 new), Size of downloads: 619 KiB