Week 14: Render 2D image on 3D world

Welcome back again!

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Week 13: Camera & Picking

How it is done

[Zooming]
- Change the value from the fov in gluPerspective(fov, ratio, .....). This happens in our
defined function called setPerspectiveView(). This function is called in the normal
keyboard function.

[Picking]
- Copy the necessary variables and functions from "picking project", and paste them
in our main project (space simulation).
- Create a boolean global variable called start.
- Check if there is a hit/screen being clicked, thus *ptr has value/name.
- If *ptr is 0 or 1(name of our spaceships), then set 'start' to true, thus rotates the
spaceships. If click on them again, 'start' is set to false, thus spaceships stop rotating.

Completed: Qn 2 & 3
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