Two mirrored objects

In that section we're going to see how we can transform an object by inverting it through a homothety axis. First, we create a component like this:

Component object = Cube(20,10,15,false)
                   - Cube(5,5,5,false).translate(15,2.5,10)
                   - Cube(5,5,10,false).translate(7.5,5,0);

We declare a component called object, which will be the result of the difference between several cubes. Main cube is a off-center cube with dimensions of 20x10x15 mm³. This object has two holes which consist of an off-center cube moved 15 mm along x axis, 2.5 mm along y axis and 10 mm along z axis, with dimensions of 5x5x5 mm³; and an off-center cube moved 7.5 mm along x axis and 5 mm along y axis, with dimensions of 5x5x10 mm³.

Now, we move object component 5 mm along y axis.

object.translate(0,5,0);

Finally, we apply the mirroredCopy function, which returns a mirrored component. The needed argument is the normal vector on a plane through the origin. We're going to use the x-z plane to mirror.

If we want to generate the OpenSCAD code for this cylinder, we simply run:

IndentWriter writer;
writer << object;
writer << object.mirroredCopy(0,1,0);
std::cout << writer;

This will send to the standard output the following:

translate(v=[0.000, 5.000, 0.000]) {
  difference() {
      cube(size=[20.000, 10.000, 15.000], center=false);
      translate(v=[15.000, 2.500, 10.000]) {
        cube(size=[5.000, 5.000, 5.000], center=false);
      } // End translate
    translate(v=[7.500, 5.000, 0.000]) {
      cube(size=[5.000, 5.000, 10.000], center=false);
    } // End translate
  } // End difference 19
} // End translate
mirror(v=[0.000, 1.000, 0.000]) {
  translate(v=[0.000, 5.000, 0.000]) {
    difference() {
        cube(size=[20.000, 10.000, 15.000], center=false);
        translate(v=[15.000, 2.500, 10.000]) {
          cube(size=[5.000, 5.000, 5.000], center=false);
        } // End translate
      translate(v=[7.500, 5.000, 0.000]) {
        cube(size=[5.000, 5.000, 10.000], center=false);
      } // End translate
    } // End difference 19
  } // End translate
} // End mirror

The full code is:

 
int main()
{
  // Create a component called object. Create a 20x10x15 off-center cube.
  // Create a 5x5x5 off-center cube and translate it.
  // Create a 5x5x10 off-center cube and translate it.
  // At main cube subtract the others. 
  Component object = Cube(20,10,15,false)
                     - Cube(5,5,5,false).translate(15,2.5,10)
                     - Cube(5,5,10,false).translate(7.5,5,0);
 
  // Translate object 5 mm in positive x.
  object.translate(0,5,0);
 
  //Generate the OpenScad code
  IndentWriter writer;
  writer << object;
  writer << object.mirroredCopy(0,1,0);
  std::cout << writer;
 
  return 0;
}

Next Tutorial: The Random Forest (adding colors)