+module InterlockLobePlan(r, ymir) {
+ dx = sqrt(3) * r;
+ $fn= 80;
+ translate([thehd[0], 0]){
+ mirror([0,ymir,0]){
+ circle(r=r);
+ difference(){
+ translate([-dx, -0.1])
+ square([ dx*2, r/2 + 0.1 ]);
+ for (xi = [-1, 1]) {
+ translate([ xi*dx, r ])
+ circle(r=r);
+ }
+ }
+ }
+ }
+}
+
+module InterlockLobeCore(negative=0) {
+ r = negative ? interlock_negative_rad : interlock_rad;
+ plusth = negative * 1.0;
+ ymir = negative ? 0 : 1;
+ translate([0, 0, plusth]){
+ mirror([0,0,1]){
+ linear_extrude(height=tile_th+plusth*2, convexity=10){
+ InterlockLobePlan(r, ymir);
+ }
+ }
+ }
+}
+
+module InterlockLobe(this_cnr, right_cnr, negative=0) {
+ INREFFRAME(this_cnr, right_cnr)
+ InterlockLobeCore(negative);