A final option is to use MRIcroGL instead of Surfice, if you have a voxel-based representation of your data


import gl
gl.resetdefaults()
#open background image
gl.loadimage('spm152')
#open overlay: show positive regions
gl.overlayload('spmMotor')
gl.minmax(1, 4, 4)
gl.opacity(1,50)
gl.clipazimuthelevation(0.5, 270, 0)