# OPENGL ORANGE BOOK PDF

Color[ edit ] Using monitors RGB to define a single color[ edit ] There are many ways to specify a color in computer graphics, but one of the simplest and most widely used methods of describing a color is the RGB color model. RGB stands for the colors red, green and blue: the additive primary colors. Each of these colors is given a value, in OpenGL usually a value between 0 and 1. We can mix these three colors together to give us a complete range of colors, as shown to on the left. For instance, pure red is represented as 1, 0, 0 and full blue is 0, 0, 1. White is the combination of all three, denoted 1, 1, 1 , while black is the absence of all three, 0, 0, 0.

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Color[ edit ] Using monitors RGB to define a single color[ edit ] There are many ways to specify a color in computer graphics, but one of the simplest and most widely used methods of describing a color is the RGB color model.

RGB stands for the colors red, green and blue: the additive primary colors. Each of these colors is given a value, in OpenGL usually a value between 0 and 1.

We can mix these three colors together to give us a complete range of colors, as shown to on the left. For instance, pure red is represented as 1, 0, 0 and full blue is 0, 0, 1. White is the combination of all three, denoted 1, 1, 1 , while black is the absence of all three, 0, 0, 0. Yellow is the combination of red and green, as in 1, 1, 0. Orange is yellow with slightly less green, represented as 1, 0. For more information on RGB, see the Wikipedia article.

Using glColor3f[ edit ] glColor3f takes 3 arguments: the red, green and blue components of the color you want. After you use glColor3f, everything you draw will be in that color. Play with glColor3f , passing different arguments in. See if you can make dark green, light gray or teal.

When it is used this way, it can be used to give each vertex its own color. The resulting rectangle is then shaded with an attractive color gradient, as shown on the right.

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## OPENGL ORANGE BOOK PDF

Still, they provide a good grounding that allows you to learn the basics of OpenGL. These versions are very close to the original source code. The OpenGLContext tests directory also has four of the tutorials converted, "alpha", "alpha3D", "surface" and "trim". The shaders described cover the gamut from the simplest 1-line shaders through code to emulate legacy operation to non-realistic shading to caustics and the like.

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## OpenGL Programming/Basics/Color

The book targets an audience that is already familiar with computer graphics and with OpenGL. Furthermore, knowledge of the C programming language is expected. The next few chapters introduce the syntax and semantics of GLSL. All the usual control flow statements, such as if statements and for loops, are available. However, the language adds some graphics-specific types, such as vectors and matrices. Even though this material is fairly dry, the writing is easy to follow and all concepts are presented with plenty of examples.

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