OpenGL – Build high performance graphics

Implementing shadow mapping with FBO

Shadows give important cues about the relative positioning of graphical objects. There are myriads of shadow generation techniques, including shadow volumes, shadow maps, cascaded shadow maps, and so on. An excellent reference on several shadow generation techniques is given in the See also section. We will now see how to carry out basic shadow mapping using FBO.

Getting started

For this recipe, we will use the previous scene but instead of a grid object, we will use a plane object so that the generated shadows can be seen. The code for this recipe is contained in the Chapter4/ShadowMapping directory.

How to do it…

Let us start with this recipe by following these simple steps:

1. Create an OpenGL texture object which ...