OpenGL ES 2 for Android

Exercises

Before we head on to the next part of the book, let’s take some time to complete the following exercises:

• Since we’re not changing the view matrix on every frame, what could you do to optimize the updates to viewProjectionMatrix and invertedViewProjectionMatrix?

• The puck currently reacts the same whether the mallet strikes it directly or on the side. Update the collision code to take the striking angle into account; Figure 43, ​Unit circle​, might give you an idea of how to approach this.

• Update the collision code so that the puck also interacts with the mallets when it’s moving on its own; for bonus points, make its motion frame-rate independent. Hint: Store your movement vector as units per second, and figure out how much time has ...