* GLTFLoader: Add KHR_materials_volume and KHR_materials_ior extensions support

* Update example screenshot

* Update webgl_panorama_cube.html

* Update webgl_panorama_cube.html

* Update webgl_panorama_cube.html

* fix(TrackballControls): fix scale finished rorate on mobild

* Revert "fix(TrackballControls): fix scale finished rorate on mobild"

This reverts commit 229b0c4a5522a929117fcd422398b537a9946b30.

* fix(TrackballControls): fix in example/jsm
Co-authored-by: Nshen <shenhao@uu898.com>

* Docs: fix links in OrbitControls

* Docs: fix typo in OrbitControls

* Expose Raycaster object in TransformControls

* Rename getSharedRaycater() to getRaycaster()
Co-authored-by: NAdam Spindler <aspindler@tesla.com>

* HTMLMesh: Reuse <canvas> instance.

* Updated examples builds

* WireframeGeometry: Prevent duplicate edges.

* Update WireframeGeometry.js

This reverts commit 8837fac2.

* Modified the WebXR Layers example to render a Snellen eye chart using
  both standard rendering to the eye buffer and WebXR layers. This
  demonstrates the quality improvement of layers for text legibility.
* Added snellen.png which is a custom image rendered with a JS
  canvas based on the standard eye chart.
Co-authored-by: NSameer Padala <sameer@padalas.net>

* Fix regression in WebXR

* Use WebGLState to set WebXR framebuffer
Co-authored-by: NRik Cabanier <cabanier@fb.com>

This reverts commit 581cc970.