-10-
åThe set of points within the slab is described by the
inequality
ïy
· cos(a) - z · sin(a) -sï
< 1/2w
for
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:
abs(y*cosd(25)-z*sind(25)-20)-15
where
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)
ØBy using Automate and
setting the angle (25 above) and/or the offset (20 above) to depend on ‘t’, we can make a
sequence of images where the slab
rotates downwards and/or moves backwards
