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Advanced Transformations (Multiple Translations and Rotations)

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Advanced Transformations (Multiple Translations and Rotations) OpenGL is a very powerful and simple graphics library but it still needs some familiarity in order to use it. One of the most problematic areas for new programmers is the transformations which include modeling, viewing and projection operations.  The topic of this tutorial is modeling and viewing transformations. These are translate, rotate and scale. The most important thing to remember is that the order of transformations matters! Imagine that you have an object in the center of your world and you are thinking of rotating it 30 degrees and translating it by 10 units on the positive x-axis. As you can see in the following figure the order that you apply these two transformations not only matters but is critical, as translating and then rotating and rotating and then translating results in two extremely different results. In this tutorial we will create a quite complicated scene consisting of 1 cube, 1 sphere, 10 icosahedrons and 20 toruses moving in the pattern shown in the introductory image of this page. The middle screenshot is quite informative as it shows the trajectory of our objects. It was created by repeatedly drawing on the buffer without clearing it. In the final application the user can interactively select whether the color and depth buffers should be cleared or not using the 'a' and 's' keys. 

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Advanced Transformations (Multiple Translations and Rotations)

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