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  Tutorial: C and Cpp Graphics Projections Tutorial

Learn about Using Projects in OpenGL.

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C and Cpp Graphics Projections

In this lesson we will learn about Projections and even put them to some simple use to see them in action. Some of you may have realized that weÕve used projection transformations in code before, and your right, we have. The difference is now we will discuss how they work, and then demonstrate these concepts.

OpenGL consists of two general classes of projection transformations: orthographic (parallel) and perspective. So let's get into detail on both of these!

Orthographic, or parallel, projections consist of those that involve no perspective correction. There is no adjustment for distance from the camera made in these projections, meaning objects on the screen will appear the same size no matter how close or far away they are.

Traditionally this type of projection was included in OpenGL for uses in CAD, or Computer Aided Design. Some uses of orthographic projections are making 2D games, or for creating isometric games. To setup this type of projection we use the OpenGL provided glOrtho() function.


 

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