Step 2 § Modify cylinders to be as shown here Create 3 cylinders § Add a new method to create cones as shown here. A cone is like a cylinder with a dot at the top instead of a circle. Create 3 cones
Step 5 § Follow the previous example and add a directional source of light, i.e., include normal calculation (normal per vertex) § Make the source of light rotate around Z-axis (rotation with a radius of 500 is shown below)
Step 6 § Put at the center at least a cylinder, a cone, and a dome (as the orange image below) § Make at least a cylinder, a cone and a dome rotate around the previous ones. They can follow the same orbit (in red) or diverse concentric orbits. § Keep the light rotating as described before in part 5 (orbit in white).