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Beginning Android Games by Mario Zechner

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Chapter 10. OpenGL ES: Going 3D

Super Jumper worked out rather well with our 2D OpenGL ES rendering engine. Now it's time to go full 3D. We actually already worked in a 3D space when we defined our view frustum and the vertices of our sprites. In the latter case the z-coordinate of each vertex was simply set to zero by default. The difference from 2D rendering isn't all that big, really:

  • Vertices not only have x- and y-coordinates, but also a z-coordinate.

  • Instead of an orthographic projection, we use a perspective projection. Objects further away from the camera will appear smaller.

  • Transformations, such as rotations, translations, and scales, have more degrees of freedom in 3D. Instead of just moving the vertices in the x-y plane we can now move ...

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