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Real-Time 3D Graphics with WebGL 2

You're reading from   Real-Time 3D Graphics with WebGL 2 Build interactive 3D applications with JavaScript and WebGL 2 (OpenGL ES 3.0)

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Product type Paperback
Published in Oct 2018
Publisher Packt
ISBN-13 9781788629690
Length 500 pages
Edition 2nd Edition
Languages
Tools
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Authors (2):
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Farhad Ghayour Farhad Ghayour
Author Profile Icon Farhad Ghayour
Farhad Ghayour
Diego Cantor Diego Cantor
Author Profile Icon Diego Cantor
Diego Cantor
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Toc

Table of Contents (14) Chapters Close

Preface 1. Getting Started FREE CHAPTER 2. Rendering 3. Lights 4. Cameras 5. Animations 6. Colors, Depth Testing, and Alpha Blending 7. Textures 8. Picking 9. Putting It All Together 10. Advanced Techniques 11. WebGL 2 Highlights 12. Journey Ahead 13. Other Books You May Enjoy

Time for Action: Rotations in World Space vs Camera Space

Let's cover an example showing the different rotations in different spaces:

  1. Open ch04_02_model-view-rotation.html in your browser:
  1. As we did in the previous example, we will see the following:
    • A cone at the origin of the world
    • The camera is located at [0, 2, 50] in world coordinates
    • Three sliders that allow us to rotate either the world or the camera
    • A matrix where we can see the result of different rotations
  2. Let's see what happens to the axis after we apply a rotation. With the World coordinates selected, rotate the world 90 degrees around the x-axis. What does the Model-View matrix look like?
  3. Let's see where the axes end up after a 90 degree rotation around the x-axis:
    • By looking at the first column, we can see that the x-axis has not changed. It's still [1, 0, 0]. This makes sense since we...
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