# Core Constants

## Revision Number

`THREE.REVISION`
The current three.js [link:https://github.com/mrdoob/three.js/releases revision number].

## Color Spaces

`THREE.NoColorSpace THREE.SRGBColorSpace THREE.LinearSRGBColorSpace`

[page:NoColorSpace] defines no specific color space.

[page:SRGBColorSpace] (“sRGB”) refers to the color space defined by the Rec. 709 primaries, D65 white point, and nonlinear sRGB transfer functions. sRGB is the default color space in CSS, and is often found in color palettes and color pickers. Colors expressed in hexadecimal or CSS notation are typically in the sRGB color space.

[page:LinearSRGBColorSpace] (“Linear-sRGB”) refers to the sRGB color space (above) with linear transfer functions. Linear-sRGB is the working color space in three.js, used throughout most of the rendering process. RGB components found in three.js materials and shaders are in the Linear-sRGB color space.

For further background and usage, see Color management.

## Mouse Buttons

`THREE.MOUSE.LEFT THREE.MOUSE.MIDDLE THREE.MOUSE.RIGHT THREE.MOUSE.ROTATE THREE.MOUSE.DOLLY THREE.MOUSE.PAN`

The constants LEFT and ROTATE have the same underlying value. The constants MIDDLE and DOLLY have the same underlying value. The constants RIGHT and PAN have the same underlying value.

## Touch Actions

`THREE.TOUCH.ROTATE THREE.TOUCH.PAN THREE.TOUCH.DOLLY_PAN THREE.TOUCH.DOLLY_ROTATE`

## Source

[link:https://github.com/mrdoob/three.js/blob/master/src/constants.js src/constants.js]