Customizing the Render Pipeline
In Chapter 5, Let’s Light It Up!, we discussed adding color, textures, and lights to a scene. In our project, we colored vertices, applied textures, and turned on lights with single OpenGL calls.
Now in this chapter we will investigate how the color of all pixels is calculated through the use of shaders. When working with shaders, all the mathematics is revealed. With a few modifications to your project, by the end of this chapter you will be using shaders for the following purposes:
- Coloring and texturing mesh faces
- Turning on the lights
We will begin by grabbing the UV values that come with the OBJ model file and passing these values and a texture to a vertex and fragment shader for processing. This will allow us to color a model using an external image. Following this, because a plain image on a model will look rather flat, we’ll examine the fundamental lighting models that have been traditionally used to emulate...
