This means a value of zero is right on the origin, and a value of 8 in the X axis will be the mirror of a value of -8. On one side of the origin an axis value will be in positive numbers, and on the other it will be negative. The point at which all three axes intersect is called the origin. This is what we would call ‘moving in the Z axis’. The direction of the motion will depend on whether you add or subtract from the axis value. Should you change your object’s Z value, for example, your object will move up or down along that axis. They represent the forward/backward, left/right, and up/downdirections respectively.Įach object in your game world has a value for each axis, the three of which combined tell Unreal where to place it in the scene. The most important point to remember (and if you take nothing else from this guide – let it be this!) is that the virtual space inside your Unreal project is determined by three axes – X, Y, and Z.
That said, no matter which system you’re working with, the information within this guide should remain relevant. Converting Cartesian coordinates to polar coordinates, for example, is possible within C++, Blueprint, and the Material Editor. Although Unreal Engine uses a Cartesian coordinate system, in a limited fashion the engine does support other systems as well. Side note: There are multiple systems for calculating and interpreting coordinates. With this data you can calculate the distance between objects, rotation, velocity, and all sorts of other useful information. In a game engine it’s the coordinate system’s role to define both the location of each object, and which direction it is facing. The mathematical term ‘coordinate system’ describes a way of using numbers to specify the location of a point (or points) in 2D or 3D space. For those who’d like a little more comprehensive breakdown of what all of this means (and why you need to know), let’s take a closer look.
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