Book Image

OpenGL Development Cookbook

By : Muhammad Mobeen Movania
Book Image

OpenGL Development Cookbook

By: Muhammad Mobeen Movania

Overview of this book

OpenGL is the leading cross-language, multi-platform API used by masses of modern games and applications in a vast array of different sectors. Developing graphics with OpenGL lets you harness the increasing power of GPUs and really take your visuals to the next level. OpenGL Development Cookbook is your guide to graphical programming techniques to implement 3D mesh formats and skeletal animation to learn and understand OpenGL. OpenGL Development Cookbook introduces you to the modern OpenGL. Beginning with vertex-based deformations, common mesh formats, and skeletal animation with GPU skinning, and going on to demonstrate different shader stages in the graphics pipeline. OpenGL Development Cookbook focuses on providing you with practical examples on complex topics, such as variance shadow mapping, GPU-based paths, and ray tracing. By the end you will be familiar with the latest advanced GPU-based volume rendering techniques.
Table of Contents (15 chapters)
OpenGL Development Cookbook
About the Author
About the Reviewers

Implementing view frustum culling

When working with a lot of polygonal data, there is a need to reduce the amount of geometry pushed to the GPU for processing. There are several techniques for scene management, such as quadtrees, octrees, and bsp trees. These techniques help in sorting the geometry in visibility order, so that the objects are sorted (and some of these even culled from the display). This helps in reducing the work load on the GPU.

Even before such techniques can be used, there is an additional step which most graphics applications do and that is view frustum culling. This process removes the geometry if it is not in the current camera's view frustum. The idea is that if the object is not viewable, it should not be processed. A frustum is a chopped pyramid with its tip at the camera position and the base is at the far clip plane. The near clip plane is where the pyramid is chopped, as shown in the following figure. Any geometry inside the viewing frustum is displayed.