Script demonstrates section of an object by Clipping Plane defined by Graphic3d_ClipPlane class.
pload XDE OCAF VISUALIZATION MODELING
# read sample model
jsupload /models/occ/as1-oc-214.stp
ReadStep D as1-oc-214.stp
vinit View1
vzbufftrihedron
XDisplay -dispMode 1 D -explore
vfit
# define Clipping Plane with -DY normal with capping
# and assign it to entire View
vclipplane c -equation 0 1 0 -60 -set -capping 1 -useObjMaterial 0
# use texture for capping
jsupload /images/hatch_1.png
vclipplane c -texName hatch_1.png -texScale 0.05 -0.05