2D geometry

Even though formo is inherently 3-dimensional, 2D geometries are also possible. Usually you can just set all z-coordinates to 0.

In this tutorial, we create a simple 2D rectangular channel with a circular obstacle.

1. Define some parameters, first:

   WIDTH = 5
   HEIGHT = 1
   RADIUS = 0.1
   CENTER = Point(1, 0, 0)
   

2. Create the rectangular channel

   pt1 = Point(0, -HEIGHT/2, 0)
   pt2 = Point(WIDTH, -HEIGHT/2, 0)
   pt3 = Point(WIDTH, HEIGHT/2, 0)
   pt4 = Point(0, HEIGHT/2, 0)
   
   wire_rect = Wire([
       Line(pt1, pt2),
       Line(pt2, pt3),
       Line(pt3, pt4),
       Line(pt4, pt1)
   ])
   rect = Face(wire_rect)
   

3. Create the circular obstacle

   wire_circ = Wire([
       Circle(CENTER, RADIUS)
   ])
   circ = Face(wire_circ)
   

4. Cut a “hole” into channel:

   channel = cut(rect, circ)
   

5. Export the final result

   write("channel.step", [channel])