In this section, we're going to look at the projections and the coordinate systems. So let's first understand what the coordinate systems are? There are two types of coordinate system: a left-handed and a right-handed coordinate system. The best way to visualize them is to put up both of your hands, as shown in the following image:
As per the image, the index fingers of both your hands should point up. Your middle fingers should point towards you and your thumbs should point to the left and right directions, respectively. Once you've done that, the direction that your fingers and your thumbs are pointing is the positive direction for that axis. So, the way the index finger is pointing (upward) is the positive y axis. The direction in which the middle finger is pointing is the positive z axis and the thumbs are pointing in the...
