clear3d( ... )
rgl.clear( type = "shapes" )
pop3d( ... )
rgl.pop( type = "shapes" )
clear3d
and rgl.clear
clear the specified stack, while rgl.pop
removes
the top-most (last added) node on the stack.
Since the bounding box is an optional element, one can disable it
with clear3d
.rgl
rgl.bbox
rgl.light