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Evaluates to 1 if both bits are 1. ^ evaluates to 1 if both bits are different. 34 PROCESSING PRIMER I: JUST THE BASICS Here are some examples: 01101010 | 01100110 --------------01101110 01101010 & 01100110 --------------01100010 01101010 ^ 01100110 --------------00001100 To learn more about the inner workings of bits, packed integers, and the operations performed on them, check out the math reference in Appendix B, in Processing: Creative Coding and Computational Art. A Primitive Sampler Next, I’ll review some of the concepts covered so far in the chapter and also showcase the set of Processing’s 2D and 3D primitives with a primitive sampler sketch.

P3D, as discussed earlier, switches Processing’s renderer from its default JAVA2D to P3D. In JAVA2D, the coordinate space is defined by the x and y axes, with the top left corner of the screen being point (0, 0), 48 PROCESSING PRIMER I: JUST THE BASICS the x axis increasing to the right, and the y axis increasing downward. The P3D renderer adds a z axis to the mix, with z axis values increasing from the computer screen to the viewer. In computer graphics, the term translate is often used to describe moving geometry (or at least moving the view of geometry) along an axis.

I’ll discuss lighting, as well as other 3D rendering effects, in Chapter 8. For now, just take a look at the last sketch without any lighting effects, shown in Figure 2-8. Figure 2-8. The effect of no lights in 3D 50 PROCESSING PRIMER I: JUST THE BASICS It’s easy to take for granted how we see three-dimensionally in the real world, especially once we get old enough to take it for granted. When I taught drawing, my biggest challenge was to convince the students that if they really wanted to learn to draw, they needed to make an effort (sometimes an emotionally fraught one) to see the world in 2D—as visual data is actually perceived on the flat surface of the retina.

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Metaprogramming Ruby by Vandenburg G.


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