How can I use the volume renderer to deal with arbitrary datasets?
• Lack of time to deal with the complexity of non-identical grids and coordinates in the overlay and underlay bricks. • The fact that this was the first time I ever used volume rendering. • The belief that people were most likely to use this on Talairach datasets, which are usually identical in conformation. As a result, the two input datasets are required to be stored on identical grids, with cubical voxels, and with axial slice orientation (as is output in the +tlrc and +acpc coordinate systems). It is possible to force a dataset into this mold, but it is a little clumsy. There are 3 steps: • Use the 3ddup program to make a “warp-on-demand” (.HEAD file only) copy of a dataset; for example: 3ddup -prefix aaa anat+orig 3ddup -prefix fff r1:time@1+orig makes the datasets aaa+orig and fff+orig, which are copies of the anatomical and functional datasets. • Run AFNI, open up the Datamode control panel, and turn on “Warp Anat on Demand” and “Warp Func on Demand”. Set the “Resam mode” for An
