revert yBar changes, also WIP on side connectors and side wall

helper/halfspace.scad

@@ -4,8 +4,17 @@ include <./math.scad>
 include <./common.scad>
 
 module halfspace(vpos, p) {
-    translate(p)
-    align(a=[0,0,-1], b=vpos)
-    translate(v=[0,0,-inf/2])
+    // TODO: clean up
+    ref = [0,0,-1];
+
+    if (cross(ref, vpos) == [0,0,0]) {
+        translate(p)
+        translate(v=[0,0, (ref*vpos) * -inf/2])
         cube(size=[inf, inf, inf], center=true);
+    } else {
+        translate(p)
+        align(a=ref, b = vpos)
+        translate(v = [0, 0, -inf/2])
+        cube(size = [inf, inf, inf], center = true);
+    }
 }