## Understanding CoordinatesEdit

You may already be familiar with the X and Y axis from math class. Remember having to graph lines and equations of the form y = mx + b? Well, 3D adds another wrinkle to this: the Z axis! Where X was "left" and "right" on graph paper and Y was "up" and "down", Z adds a third dimension: depth. That's right, the Z-axis pops right off the page! So how does one go about graphing it? Well, on paper, it usually involves drawing a diagonal line, putting tick marks on it and plotting points. This is not without its problems, so the preferred methods are **orthographic projections**, **isometric projections** and **perspective views**, all of which will be elaborated on in the following sections.