Professional WebGL Programming by Andreas Anyuru

Author:Andreas Anyuru
Language: eng
Format: epub
Publisher: Wiley
Published: 2012-04-01T16:00:00+00:00

What is worth commenting on again in the code is the order in which the view transformation and the model transformation are set up. First you set up the view transformation with mat4.lookAt(). Then you add the model transformation for the different objects to the modelview matrix. In this way, the vertices of your objects can be transformed as if they were multiplied with the model transformation first and then the view transformation. This is according to what you learned about the WebGL transformation pipeline earlier in this chapter.

One way that might help you to really master transformations is to be a bit old fashioned and use a pen and paper. Imagine an object, for example, a small cube, that you want to position and orient so you can look at it from different directions. Write down the transformations that you need to do. Then try it out in code by, for example, editing Listing 4-4. Perform the exercise over and over again until you feel comfortable with the transformations.

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