1 files changed, 32 insertions, 3 deletions
diff --git a/chess/demo.scad b/chess/demo.scad
index fb0ed95..341da35 100644
--- a/chess/demo.scad
+++ b/chess/demo.scad
@@ -1,3 +1,32 @@
-rotate_extrude (angle = 90) {
-	square(1);
-}	
-\ No newline at end of file
+// https://youtu.be/tOx5UI8GGns
+
+$fn = 8;
+
+function bezier_3(p0, p1, p2, t) =
+	(( 1 - t) ^ 2) * p0
+	+ 2 * (1 - t) * t * p1
+	+ (t ^ 2) * p2;
+
+function bezier_4(p0, p1, p2, p3, t) =
+	(( 1 - t) ^ 3) * p0
+	+ 3 * ((1 - t) ^ 2) * t * p1
+	+ 3 * (1 - t) * (t ^ 2) * p2
+	+ (t ^ 3) * p3;
+
+p0 = [0, 0];
+p1 = [10, 0];
+p2 = [0, 10];
+p3 = [0, 5];
+
+points = $fn;
+
+points_list = [for (i=[0:points]) bezier_3(p0, p1, p2, i/points)];
+
+rotate_extrude(angle = 360)
+	polygon(points_list);
+
+points_list_2 = [for (i=[0:points]) bezier_4(p0, p1, p3, p2, i/points)];
+
+translate([20, 0, 0])
+	rotate_extrude(angle = 360)
+		polygon(points_list_2);