I am running FS in a VM (Debian, wheezy) and I would like to create a 3D reconstruction of the hippocampus in .png. For that, I executed the following code lines:

>> mri_extract_label aseg.mgz 17 lh.nii

>> mri_extract_label aseg.mgz 53 rh.nii

>> freeview -slice 500 500 500 -v lh.nii:isosurface=on rh.nii:isosurface=on -viewport 3d -cam azimuth -90 elevation 25 dolly 5 -ras 0 0 10 -ss 3dhipo.png 

But I have an error with the freeview command: freeview.bin: cannot connect to X server

How can I solve it? Is there another way to generate the .png?

Best Regards,

Elena