  # Transforms

Meshes can be transformed in 3D space using the `position`, `rotation` and `scale` properties. These properties are vectors, which means they are arrays of numbers.

Let's start by a bit of theory.

## Axes

In a 3D space, there are three axes: `x`, `y`, and `z`. Each axis is a line that extends infinitely in both directions.

The axes are perpendicular to each other, which means they form a right angle at their intersection. With Three.js the axes are defined as follows:

• `x`: points to the right
• `y`: points up
• `z`: points towards the viewer

## Vector3

Vectors are used to represent points in 3D space. They are made of three numbers, one for each axis (x, y, z).

With Three.js you can create vectors using the `Vector3` class. This class is part of the `three` package, so you can import it like this:

``import { Vector3 } from "three";``

You can create a vector by passing the x, y, and z coordinates to the `Vector3` constructor:

``const vector = new Vector3(1, 2, 3);``

Threejs Vector 3 documentation

## Position

The `position` property is a 3D vector but thanks to r3f you can pass it as an array of numbers. Under the hood, r3f will convert the array to a `Vector3` object and react to changes. Most properties in r3f work this way.

The default value for the `position` property is `[0, 0, 0]`:

``<mesh position={[0, 0, 0]} />``

Download the starter pack and run `yarn` to install the dependencies and `yarn dev` to start the development server.

You should see a green cube in the middle of the screen: In fact there are 3 cubes at the exact same position.

Let's play with the `x`, `y`, and `z` coordinates to move the cubes around.

Let's try to align them on the different axes.

End of lesson preview

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