Drawing a wireframe sphere

Let's start working with 3D by creating a sphere surface and drawing it as a wireframe model.

Tip

A wireframe model is a type of graphical representation of a 3D object on the screen where only its edges are drawn. It appeared in the early era of 3D graphics as a simple way to draw objects in 3D. Now, it is used in 3D modeling software to control the structure of the created objects and as a special effect in films, games, and experimental graphics.

We will achieve this using the ofSpherePrimitive class in the following way:

1. Add the sphere object definition to the ofApp class, as follows:

   ofSpherePrimitive sphere;

2. Initialize the sphere in setup():

   sphere.set(250, 20);

   Here, the first argument, 250, is the radius of the sphere. The second argument, 20, is the resolution of the sphere. The resulting spherical surface will have 20 meridians and 20 - 1 = 19 parallels.

   Tip

   To obtain a smoother sphere, increase 20 to a larger value, for example, to 40.

3. Draw the sphere using...