Unity 4.x Game Development by Example Beginner's Guide

How they did it

The pie clock involves a little sleight of hand. Here are the pieces that make up the clock:

It's a bit like a sandwich. We start by drawing the blue background. Then, we layer on the two yellow half-moon pieces. To make the clock look pretty, we apply the lovely, shiny gloss picture in front of all these pieces.

We rotate the right half-moon piece halfway around the circle to make the slice of yellow time appear to grow smaller and smaller.

At the halfway point, we slap a half-moon section of the blue background on top of everything, ...