Problem was that objects could be added to WebGLRenderer's internal render list only once (because of `webglInit` flag).

Now there are two separate internal states (`webglInit` and `webglActive`) so that object can be initialized just once (expensive operation) but added / removed from the scene many times (cheap operation).

Also removed unused material Sprite parameter.

Added renderer.getClearAlpha. Extended RenderPass to be able to use custom alpha clear. Fixed UVs in UTF8Loader.

This allows, for example, better integration of additively blended materials with a regular scene.

Not to be confused with depthTest (which controls complete access to depth buffer, including reading).

Also messed up a bit with particle emitter example.

I knew for loops iterating over properties were slower than numerical for loops but I didn't realize how bad it was.

Gained about 10 fps in performance test, and that was for for loop iterating over single property.

Also fixed broken examples with postprocessing.

Also tried to clean whitespace for ColladaLoader. This thing is so massive.

Masking was real pain to get working with multiple render targets :/.

Unfortunately this introduced dependencies on MaskPass.js and ShaderPass.js even for use cases that do not use masking. Bah, will need to figure out some better way for deployment.

No need to use full-screen render targets for quarter-screen images (still keeping big one for geometry pass to emulate antialiasing).

Also added check for existence of normalMatrix in shader when setting uniforms in WebGLRenderer. Null was being sent to GPU for materials that don't use normals (e.g particles).

Added dot screen shader / effect. Extended postprocessing demo. Fixed viewport bug for render targets.

Work-in-progress.

Fixes lightMap bug https://github.com/mrdoob/three.js/issues/458

Fixes https://github.com/mrdoob/three.js/issues/453

Fixes https://github.com/mrdoob/three.js/issues/453

Also added some comments to uniforms setter, it's starting to get a bit messy.

* Added support to texture.offset in CanvasRenderer
* Removed ShadowVolume, ShadowVolumeDynamicMaterial and LensFlare classes.
* Removed Stencil Shadows and LensFlare code out of WebGLRenderer
* Added 2.59 folder to Blender, and removed old ones.

Impact on performance is not very big, you need a lot of triangles with complex fragment shaders to see the difference.

Added better random in GeometryUtils. Added possibility of using custom depth material for shadow maps.

DataTexture can be used in the same places like image / video based Texture (WebGLRenderer-only).

To be used like this:

var width = 64, height = 64, bytes = 3;
var data = new Uint8Array( width * height * bytes );

// fill data array with values 0 .. 255

var texture = DataTexture( data, width, height, THREE.RGBFormat );
texture.needsUpdate = true;

For the moment only UNSIGNED_BYTE type is supported.

Added alphaTest parameter to base Material plus corresponding shader chunk in standard materials implementation.

This is for having on/off transparency without sorting using threshold value in alpha channel of diffuse texture.

By default it's switched off (alphaTest = 0).

AlphaTest is not yet handled in shadow maps. This would require passing of diffuse texture to depth material in shadow map render step (and more permutations of depth material).

Nine tap sampling, by default it's on, switch off with:

renderer.shadowMapSoft = false;

Added Matrix4 type to uniforms. Fixed Texture cloning. Fixed uniforms cloning for Vector2, Vector4 and arrays.