- ctr = line_intersection_2d(
- left_cnr - clockwise2d(r_uvec) * round_cnr_rad,
- this_cnr - clockwise2d(r_uvec) * round_cnr_rad,
- this_cnr + clockwise2d(l_uvec) * round_cnr_rad,
- right_cnr + clockwise2d(l_uvec) * round_cnr_rad )
+ lp1 = left_cnr + clockwise2d(l_uvec) * bigr;
+ lp2 = this_cnr + clockwise2d(l_uvec) * bigr;
+ lp3 = this_cnr - clockwise2d(r_uvec) * bigr;
+ lp4 = right_cnr - clockwise2d(r_uvec) * bigr;
+ ctr = line_intersection_2d(lp1,lp2,lp3,lp4)