# WebGLRenderer Constants

## Cull Face Modes

`THREE.CullFaceNone THREE.CullFaceBack THREE.CullFaceFront THREE.CullFaceFrontBack`

[page:constant CullFaceNone] disables face culling.
[page:constant CullFaceBack] culls back faces (default).
[page:constant CullFaceFront] culls front faces.
[page:constant CullFaceFrontBack] culls both front and back faces.

## Shadow Types

`THREE.BasicShadowMap THREE.PCFShadowMap THREE.PCFSoftShadowMap THREE.VSMShadowMap`

These define the WebGLRenderer's [page:WebGLRenderer.shadowMap.type shadowMap.type] property.
[page:constant BasicShadowMap] gives unfiltered shadow maps - fastest, but lowest quality.
[page:constant PCFShadowMap] filters shadow maps using the Percentage-Closer Filtering (PCF) algorithm (default).
[page:constant PCFSoftShadowMap] filters shadow maps using the Percentage-Closer Filtering (PCF) algorithm with better soft shadows especially when using low-resolution shadow maps.
[page:constant VSMShadowMap] filters shadow maps using the Variance Shadow Map (VSM) algorithm. When using VSMShadowMap all shadow receivers will also cast shadows.

## Tone Mapping

`THREE.NoToneMapping THREE.LinearToneMapping THREE.ReinhardToneMapping THREE.CineonToneMapping THREE.ACESFilmicToneMapping THREE.AgXToneMapping THREE.NeutralToneMapping THREE.CustomToneMapping`

These define the WebGLRenderer's [page:WebGLRenderer.toneMapping toneMapping] property. This is used to approximate the appearance of high dynamic range (HDR) on the low dynamic range medium of a standard computer monitor or mobile device's screen.

THREE.LinearToneMapping, THREE.ReinhardToneMapping, THREE.CineonToneMapping, THREE.ACESFilmicToneMapping, THREE.AgXToneMapping and THREE.NeutralToneMapping are built-inimplementations of tone mapping. THREE.CustomToneMapping expects a custom implementation by modyfing GLSL code of the material's fragment shader. See the [example:webgl_tonemapping WebGL / tonemapping] example.

THREE.NeutralToneMapping is an implementation based on the Khronos 3D Commerce Group standard tone mapping.

## Source

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