echo("dias", r0*2, r1*2, "ratio",r1/r0);
-module CrossSection(plus=0) {
+module CrossSectionHalf(plus=0) {
difference(){
polygon([[-0.1, y_T_r * r0],
[x_T_r * r0, y_T_r * r0],
}
}
+module CrossSection(plus=0) {
+ for (m=[0,1]) {
+ mirror([m,0])
+ CrossSectionHalf(plus);
+ }
+}
+
module CrossSectionDemo(){ ////toplevel
color("black") CrossSection(2);
CrossSection();