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Cardboard VR Projects for Android

You're reading from   Cardboard VR Projects for Android Develop mobile virtual reality apps using the native Google Cardboard SDK for Android

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Product type Paperback
Published in May 2016
Publisher
ISBN-13 9781785887871
Length 386 pages
Edition 1st Edition
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Authors (2):
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Jonathan Linowes Jonathan Linowes
Author Profile Icon Jonathan Linowes
Jonathan Linowes
Matt Schoen Matt Schoen
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Matt Schoen
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Toc

Table of Contents (11) Chapters Close

Preface 1. Virtual Reality for Everyone 2. The Skeleton Cardboard Project FREE CHAPTER 3. Cardboard Box 4. Launcher Lobby 5. RenderBox Engine 6. Solar System 7. 360-Degree Gallery 8. 3D Model Viewer 9. Music Visualizer Index

The Light component


A light source in our scene is a type of Component with a color and a float array that is used to represent the calculated location in eye space. Let's create the Light class now.

Create a new Light Java class in the renderbox/components folder. Define it as follows:

public class Light extends Component {
    private static final String TAG = "RenderBox.Light";

    public final float[] lightPosInEyeSpace = new float[4];
    public float[] color = new float[]{1,1,1,1};

    public void onDraw(float[] view){
        Matrix.multiplyMV(lightPosInEyeSpace, 0, view, 0, transform.getPosition().toFloat4(), 0);
    }
}

Our default light is white (color 1,1,1).

The onDraw method calculates the actual light position in eye space based on the position of Transform multiplied by the current view matrix.

It's possible to extend RenderBox to support multiple light sources and other fancy rendering, such as shadows and so on. However, we will limit the scene to a single light source. Thus...

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