add halfspace

helper/halfspace.scad

@@ -1,2 +1,14 @@
-// TODO
-// probably want to get rotations first
+
+// Wake up sheeple. Halfspaces are just really BIG cubes!
+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])
+        cube(size=[inf, inf, inf], center=true);
+}
+
+
+halfspace(vpos=[1,1,1], p=[10,10,10]);