things

function things(clip a,clip b,int "mode1",int "mode2")
{
mode1=default(mode1,0)
mode2=default(mode2,2)
ad=mt_makediff(a.removegrain(mode2),a.removegrain(mode1),u=3,v=3)
bd=mt_makediff(b.removegrain(mode1),b.removegrain(mode2),u=3,v=3)
a.mt_adddiff(ad,u=3,v=3).mt_adddiff(bd,u=3,v=3)
}