By default the depth attachment of an `XRWebGLLayer`'s `framebuffer`, if present, may be used to assist the XR compositor. For example, the scene's depth values may be used by advanced reprojection techniques or to help avoid depth conflicts when rendering platform/UA interfaces. This assumes, of course, that the values in the depth buffer are representative of the scene content.

Some applications may violate that assumption, such as when using certain deferred rendering techniques or rendering stereo video. In those cases if the depth buffer's values are used by the compositor it may result in objectionable artifacts. To avoid this, the compositor can be instructed to ignore the depth values of an `XRWebGLLayer` by setting the `ignoreDepthValues` option to `true` at layer creation time:

```js

let webglLayer = new XRWebGLLayer(xrSession, gl, { ignoreDepthValues: true });

If `ignoreDepthValues` is not set to `true` the The UA is allowed (but not required) to use depth buffer as it sees fit. As a result, barring compositor access to the depth buffer in this way may lead to certain platform or UA features being unavailable or less robust.

boolean ignoreDepthValues = false;

readonly attribute boolean ignoreDepthValues;

The <dfn attribute for="XRRenderState">depthNear</dfn> attribute defines the distance, in meters, of the near clip plane from the viewer. The <dfn attribute for="XRRenderState">depthFar</dfn> attribute defines the distance, in meters, of the far clip plane from the viewer.

{{XRRenderState/depthNear}} and {{XRRenderState/depthFar}} is used in the computation of the {{XRView/projectionMatrix}} of {{XRView}}s and determines how the values of an {{XRWebGLLayer}} depth buffer are interpreted. {{XRRenderState/depthNear}} MAY be greater than {{XRRenderState/depthFar}}.

boolean ignoreDepthValues = false;

readonly attribute boolean ignoreDepthValues;

1. Initialize |layer|'s {{XRWebGLLayer/ignoreDepthValues}} to |layerInit|'s {{XRWebGLLayerInit/ignoreDepthValues}} value.

The <dfn attribute for="XRWebGLLayer">ignoreDepthValues</dfn> attribute, if <code>true</code>, indicates the [=XR Compositor=] MUST NOT make use of values in the depth buffer attachment when rendering. When the attribute is <code>false</code> it indicates that the content of the depth buffer attachment is expected to be representative of the scene rendered into the layer and MAY be used by the [=XR Compositor=].

Depth values stored in the buffer are expected to be between <code>0.0</code> and <code>1.0</code>, with <code>0.0</code> representing the distance of {{XRRenderState/depthNear}} and <code>1.0</code> representing the distance of {{XRRenderState/depthFar}}, with intermediate values interpolated linearly. This is the default behavior of WebGL. (See documentation for the <a href="https://www.khronos.org/registry/OpenGL-Refpages/es2.0/xhtml/glDepthRangef.xml">depthRange function</a> for additional details.))

NOTE: Making the scene's depth buffer available to the compositor allows some platforms to provide quality and comfort improvements such as improved reprojection.