camera {
   location -3*x
   look_at 0
   translate y
}

light_source {-10000*x, color 1}

plane {-x, 0 pigment {checker}}

#declare ikn_v1 = -z; // normal at start of neck
#declare ikn_p1 = <+0,+0,+0>; // startpoint of neck
#declare ikn_p2 = <+0,+2,+0>; // endpoint of neck
#declare ikn_v2 = +z; // normal at end of neck

#declare ikn_links = 200; // number of "links" in the neck
#declare ikn_length = 3.5; // length of the whole neck
#declare ikn_pre = 0.5; // *1
#declare ikn_maxcalcs = 1;// *2

#include "ikn2.inc"