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OpenGL Data Visualization Cookbook

You're reading from   OpenGL Data Visualization Cookbook Over 35 hands-on recipes to create impressive, stunning visuals for a wide range of real-time, interactive applications using OpenGL

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Product type Paperback
Published in Aug 2015
Publisher Packt
ISBN-13 9781782169727
Length 298 pages
Edition 1st Edition
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Table of Contents (11) Chapters Close

Preface 1. Getting Started with OpenGL FREE CHAPTER 2. OpenGL Primitives and 2D Data Visualization 3. Interactive 3D Data Visualization 4. Rendering 2D Images and Videos with Texture Mapping 5. Rendering of Point Cloud Data for 3D Range-sensing Cameras 6. Rendering Stereoscopic 3D Models using OpenGL 7. An Introduction to Real-time Graphics Rendering on a Mobile Platform using OpenGL ES 3.0 8. Interactive Real-time Data Visualization on Mobile Devices 9. Augmented Reality-based Visualization on Mobile or Wearable Platforms Index

Creating a 3D plot with perspective rendering

In the previous chapter, we showed a heat map of a 2D Gaussian distribution with varying standard deviation over time. Now, we will continue with more advanced rendering of the same dataset in 3D and demonstrate the effectiveness of visualizing multi-dimensional data with OpenGL. The code base from the previous chapter will be modified to enable 3D rendering.

Instead of rendering the 2D Gaussian distribution function on a plane, we take the output of the Gaussian function Creating a 3D plot with perspective rendering as the z (height) value as follows:

Creating a 3D plot with perspective rendering

Here A is the amplitude of the distribution centered at Creating a 3D plot with perspective rendering, and Creating a 3D plot with perspective rendering are the standard deviations (spread) of the distribution in the x and y directions. In our example, we will vary the spread of the distribution over time to change its shape in 3D. Additionally, we will apply a heat map to each vertex based on the height for better visualization effect.

Getting ready

With the camera set up using the projection model, we can render our graph in 3D...

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