added starburst

src/starburst.scad

@@ -0,0 +1,32 @@
+module starburst(r1, r2, n, height) {
+    a = 180 / n;
+
+    p0 = [0, 0, 0];
+    p1 = [r2 * cos(a), r2 * sin(a), 0];
+    p2 = [r1, 0, 0];
+    p3 = [0, 0, height];
+
+    module half_burst() {
+        polyhedron(points = [p0, p1, p2, p3], 
+            faces = [
+                [0, 2, 1],
+                [0, 1, 3],
+                [0, 3, 2], 
+                [2, 1, 3]
+            ]
+        );
+    }
+
+    module burst() {
+        hull() {
+            half_burst();
+            mirror([0, 1,0]) half_burst();
+        }
+    }
+
+    union() {
+        for(i = [0 : n - 1]) {
+            rotate(2 * a * i) burst();
+        }
+    }
+}