-9-
åThe set of points within the slab is described by the inequality
å•y á cos(a) - z á sin(a) -s• <  1/2w
åfor angle=a, slab center offset=s, and slab width=w.  To render a slanted coronal slab 30 mm thick, tilted posteriorly from the vertical of 25o, we would use this for the cutout expression:
å
å     abs(y*cosd(25)-z*sind(25)-20)-15
å
åwhere the sind() and cosd() functions take arguments in degrees, and where the offset has been set to 20 mm (you will have to alter this offset to get the exact position you want)
å
ØBy using Automate and setting the angle (25 above) and/or the offset (20 above) to depend on ÔtÕ, we can make a sequence of images where the slab rotates downwards and/or moves backwards