Hi Kazu,
There is no trouble with NIfTI datastes, as far as I know. The
fact that converting them to AFNI format still fails is more
telling.
I suspect they are in float format, which the renderer does not
accept. Consider using 3dcalc to convert the data to scaled
shorts (in AFNI format, since NIfTI does not handle multiple
sub-bricks of scaled shorts).
3dcalc -a dset.nii -datum short -prefix dset_short -expr a
- rick