* add ability to specify on MeshDepthMaterial the type of depth packing one wants.

* depthRGBA -> clipZRGBA - more correct name.

* forgotten replace of depthRGBA -> clipZRGBA.

* add MeshDepthMaterial depthFormat + depthPacking.  Use equations compatible with z buffers.

* adopting MeshDepthMaterial instead of clipZRGBA.

* remove clipZRGBA shader (aka depthRGBA shader) as we can now use MeshDepthMaterial for it.

* remove some comments.

* enable skinning in MeshDepthMaterial, as it was enabled in depthRGBA material.

* remove unused shader.

* fix bug.

* fix bug in shadows with MEshDepthMaterial.

* remove unnecessary debug code.

* ensure that skinning and morphTargets propagate with MeshDepthMaterial.

* fix ssao example to use new MeshDepthMaterial.

* remove unused code.

* add method docs

intersectsBox method not documented.

* correct isEmpty method name

correct isEmpty method name

* special purpose materials.

* rename example from special_purpose -> channels.  Add camera controls.

* minor polish to webgl_materials_channels.

* add standard material with displacement, normal and ao to show contract with normal and depth materials.

* fix orthographic camera near/far bounds.

* remove double add of material_channels example.

* fix MeshDepthMaterial.

* use a single float instead of a vec3 for optimization purposes.

* use ThreeJS conventions for varyings.

intersectsBox method not documented.

The docs list it as "uvGenerator" instead of "UVGenerator", took me a while to spot why it wasn't working...

The doc is outdated, the parameters are now located instead of the parameters property, (e.g. there is no myPlane.width)

Minor documentation errors in ImageLoader and TextureLoader.

* Implemented user-defined clipping planes.

* Renderer: Minor documentation update.

* Implements object-level clipping.

* Renderer: Minor cosmetic changes.

* Fixed lethal typo in normal shader.

* Let shadows respect .side of object's material.

* Fixed Plane.applyMatrix4.

- Scale denormalized but did not scale the position
- Projection is not supported (solved by documentation)
- Removed unnecessary copying to make up for the normalization
- Still arguably too heavy

* Added custom clipping example.

* Clipping: Fixed transition to disabled state.

* Improved custom clipping example.

- GUI dependency of volume visualization on Enabled state
- Larger radius for cylindrical global clipping area

* No .matrixAutoUpdate = false in clipping example.

* Let ShadowMap check renderer.localClippingEnabled.

* Added a simplified clipping example.

* trying to unify packing.  Untested.

* adopt packing.glsl in ShaderSkin.js

* adopt fract because theoretically it should be faster, no divide.

* remove whitespace.

* Revert "adopt fract because theoretically it should be faster, no divide."

This reverts commit 8dfb3f1d2a53d389540bb514d5fc183605e9b133.

* Examples: Removed deprecated THREE.ClosedSplineCurve3

This commit replaces THREE.ClosedSplineCurve3 with
THREE.CatmullRomCurve3

* Curve: Removed reference to deprecated THREE.ClosedSplineCurve3

* Post-Processing: Introducing base class for Passes

* Post-Processing: move pass to effect composer

CylinderBufferGeometry with 3 different textures when used with

Multimaterial

* Reintroduce MeshPhysicalMaterial

* Reintroduce MeshPhysicalMaterial

* Simplified conditionals

* Revised PerspectiveCamera.

- Allows extra skew for stereo rendering.
- Allows to query effective FOV angle (considering .zoom).
- Proper copy / serialization of all properties.
- Tidier, single code path frustum calculation.
- No longer uses ProjectionMatrix.makePerspective.

* Revised PerspectiveCamera physical interface.