cad/test2/button.py: Cadmium version without artifact prevention

Surprisingly, this renders much quicker and still doesn't produce any
artifacts.

cad/test2/button.py

@@ -0,0 +1,141 @@
+#!/usr/bin/python
+
+# all dimensions are mm
+
+from cadmium import *
+
+
+but_top_x = 10.0
+but_top_y = but_top_x+5.0
+but_top_z = 1.5
+
+but_corner_r = 2.0
+
+but_base_border = 1.0
+but_base_x = but_top_x+2*but_base_border
+but_base_y = but_top_y+2*but_base_border
+but_base_z = 0.5
+
+but_fillet_r = 0.4
+but_chamfer_r = 0.2
+
+
+# ----- Helper elements for fillets -------------------------------------------
+
+
+def fillet_line(x, r):
+	s = Box(x, r, r)
+	s -= Cylinder(r, h = x).					\
+	    rotate(Y_axis, 90).						\
+	    translate(0, r, r)
+	return s.translate(-x/2, 0, 0)
+
+def fillet_circle(r, fillet_r):
+	return Cylinder(r+fillet_r, h = fillet_r)-			\
+	    Torus(r+fillet_r, fillet_r, center = True).			\
+	    translate(0, 0, fillet_r)
+
+
+# ----- Helper elements for chamfers ------------------------------------------
+
+
+def chamfer_line (x, r):
+	s = Box(x, r, r)
+	s -= Cylinder(r, h = x).					\
+	    rotate(Y_axis, 90)
+	return s.translate(-x/2, -r, -r)
+
+def chamfer_circle(r, fillet_r):
+	return Box(2*(r), 2*(r), fillet_r).				\
+	    translate(-r, -r, -fillet_r)-				\
+	    Cylinder(r-fillet_r, h = fillet_r).				\
+	    translate(0, 0, -fillet_r)-					\
+	    Torus(r-fillet_r, fillet_r, center = True).			\
+	    translate(0, 0, -fillet_r)
+
+
+# ----- Box with rounded corners ----------------------------------------------
+
+
+def rbox_core(x, y, z, r):
+	return  Box(x-2*r, y, z, center = True).translate(0, 0, z/2)+ \
+	    Box(x, y-2*r, z, center = True).translate(0, 0, z/2)
+
+def rbox(x, y, z, r):
+	s = rbox_core(x, y, z, r)
+	for dx in [-1, 1]:
+		for dy in [-1, 1]:
+			s += Cylinder(r, h = z).			\
+			    translate(dx*(x/2-r), dy*(y/2-r), 0)
+	return s
+
+def rbox_fillet_bottom(x, y, z, r, fillet_r):
+	s = None
+	for a in [0, 180]:
+		t = fillet_line(x-2*r, fillet_r).			\
+		    translate(0, y/2, 0).				\
+		    rotate(Z_axis, a)
+		if s is None:
+			s = t
+		else:
+			s += t
+		s += fillet_line(y-2*r, fillet_r).			\
+		    translate(0, x/2, 0).				\
+		    rotate(Z_axis, a+90)
+	for dx in [-1, 1]:
+		for dy in [-1, 1]:
+			s += fillet_circle(r, fillet_r).		\
+			    translate(dx*(x/2-r), dy*(y/2-r), 0)
+	return s
+
+def rbox_chamfer_top_corners(x, y, z, r, chamfer_r):
+	s = None
+	for dx in [-1, 1]:
+		for dy in [-1, 1]:
+			t = chamfer_circle(r, chamfer_r).		\
+			    translate(dx*(x/2-r), dy*(y/2-r), z)
+			if s is None:
+				s = t
+			else:
+				s += t
+	return s-rbox_core(x, y, z, r)
+
+def rbox_chamfer_top(x, y, z, r, chamfer_r):
+	s = rbox_chamfer_top_corners(x, y, z, r, chamfer_r)
+	for a in [0, 180]:
+		s += chamfer_line(x-2*r, chamfer_r).			\
+		    translate(0, y/2, z).				\
+		    rotate(Z_axis, a)
+		s += chamfer_line(y-2*r, chamfer_r).			\
+		    translate(0, x/2, z).				\
+		    rotate(Z_axis, a+90)
+	return s
+
+def rbox_chamfer_bottom(x, y, z, r, chamfer_r):
+	return rbox_chamfer_top(x, y, z, r, chamfer_r).			\
+	    translate(0, 0, -z).					\
+	    rotate(X_axis, 180)
+
+# ----- Button ----------------------------------------------------------------
+
+
+def button_top():
+	return rbox(but_top_x, but_top_y, but_top_z, but_corner_r)-	\
+	    rbox_chamfer_top(but_top_x, but_top_y, but_top_z,		\
+	    but_corner_r, but_chamfer_r)+				\
+	    rbox_fillet_bottom(but_top_x, but_top_y, but_top_z, but_corner_r,
+	    but_fillet_r)
+
+def button_base():
+	s = rbox(but_base_x, but_base_y, but_base_z, but_corner_r)-	\
+	    rbox_chamfer_top(but_base_x, but_base_y, but_base_z,	\
+	    but_corner_r, but_chamfer_r)-				\
+	    rbox_chamfer_bottom(but_base_x, but_base_y, but_base_z,	\
+	    but_corner_r, but_chamfer_r)
+	return s.translate(0, 0, -but_base_z)
+
+def button():
+	return button_top()+button_base()
+
+b = button()
+b.toSTL("button.stl")